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Determination of the Service Methane Number Peter Eilts, Lennart - - PowerPoint PPT Presentation

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Institute of internal combustion engines Prof. Dr.-Ing. Peter Eilts Determination of the Service Methane Number Peter Eilts, Lennart Klare, 22.08.2017 Institute of Internal Combustion Engines Outline Knocking Methane Number

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SLIDE 1

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Peter Eilts, Lennart Klare, 22.08.2017 Institute of Internal Combustion Engines

Determination of the Service Methane Number

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SLIDE 2
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 2

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts
  • Knocking
  • Methane Number
  • Service Methane Number
  • Experimental Setup
  • Experimental Procedure
  • Results
  • Conclusions

Outline

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SLIDE 3
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 3

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts
  • Knocking
  • Methane Number
  • Service Methane Number
  • Experimental Setup
  • Experimental Procedure
  • Results
  • Conclusions

Outline

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SLIDE 4
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 4

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Flame propagation with normal combustion Knocking

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SLIDE 5
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 5

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Flame propagation with knocking combustion Knocking

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SLIDE 6
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 6

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Cylinder pressure with knocking combustion Knocking

Flame speed ca.10 … 25 m/s 250 … 300 m/s

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SLIDE 7
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 7

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts
  • Knocking
  • Methane Number
  • Service Methane Number
  • Experimental Setup
  • Experimental Procedure
  • Results
  • Conclusions

Outline

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SLIDE 8
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 8

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Definition of the Methane Number

  • The Methane Number (MN) of a gas is defined as the percentage of Methane

in a mixture of Methane and Hydrogen which has the same knocking behaviour as the gas to be investigated in a defined test engine under defined

  • perating conditions.
  • It was developed by AVL in the late 1960s.

Methane Number

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SLIDE 9
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 9

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

AVL, MWM and NPL correlation

  • A correlation developed by AVL exists which allows to calculate the MN of a

gas from its composition.

  • In this correlation higher hydrocarbons (> C4) are only considered in a very

simple manner.

  • The AVL correlation has been further developed by MWM. Now higher

hydrocarbons are considered in more detail. Further the influence on N2 is treated differently.

  • Besides the AVL and MWM correlation there are further methods in the

literature.

  • In this project NPL has developed another correlation which is also based on

the AVL data.

Methane Number

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SLIDE 10
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 10

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Measurement of the MN

  • The MN can only be measured with the requipment used by AVL during the

development of the method, just like the RON and MON can only be measured with a CFR engine.

  • Unfortunately this equipment is not readily available.
  • If a different engine or different operating conditions are employed the results

are different. The result is called the Service Methane Number (SMN).

Methane Number

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SLIDE 11
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 11

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts
  • Knocking
  • Methane Number
  • Service Methane Number
  • Experimental Setup
  • Experimental Procedure
  • Results
  • Conclusions

Outline

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SLIDE 12
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 12

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Definition of the Service Methane Number

  • The Service Methane Number (SMN) of a gas is defined as the percentage of

Methane in a mixture of Methane and Hydrogen which has the same knocking behaviour as the gas to be investigated in an arbitrary engine under arbitrary

  • perating conditions.
  • The SMN shows the same tendencies as the MN, but different absolute

values.

  • For mixtures of Methane and Hydrogen the SMN is equivalent to the MN.

Service Methane Number

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  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 13

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

SMN of NG-Propane-mixtures at different engine speeds Service Methane Number

[1], Fig. 5.14

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SLIDE 14
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 14

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts
  • Knocking
  • Methane Number
  • Service Methane Number
  • Experimental Setup
  • Experimental Procedure
  • Results
  • Conclusions

Outline

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SLIDE 15
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 15

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts
  • Engine: externally supercharged 1-cylinder 4-stroke SI-engine with a

displacement of 600 ccm. Compression ratio 12.5:1. Connected to a dynamometer.

  • Fully indicated engine (intake-, cylinder- and exhaust pressure for every 0.1

degree crank angle)

  • Multi point gas injection in the intake pipe ( 2 gas injectors)
  • Stoichiometric operation

Experimental Setup

Engine 1

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SLIDE 16
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 16

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts
  • Engine: externally supercharged 1-cylinder 4-stroke SI-engine with a

displacement of 200 ccm. Compression ratio 12.5:1. Connected to a dynamometer.

  • Fully indicated engine (intake-, cylinder- and exhaust pressure for every 0.1

degree crank angle)

  • Single point gas injection in the intake pipe
  • Stoichiometric operation

Experimental Setup

Engine 2

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SLIDE 17
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 17

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Experimental Setup

Engine 1 and 2, pressure indication

Equipment to measure the pressure in the combustion chamber, intake and exhaust system:

  • Pressure transducer
  • Charge amplifier
  • Evaluation unit

[2]

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  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 18

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts
  • In the „KiBox“ software the knock detection algorithm ist implemented

Experimental Setup

Knock detection

  • 1. Find pressure maximum
  • 2. Smooth the signal through a moving average
  • 3. Subtract the moving average signal from the raw signal

[3]

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SLIDE 19
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 19

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts
  • In the „KiBox“ software the knock detection algorithm ist implemented

Experimental setup

Knock detection

  • 4. Rectification
  • 5. Selection of reference and knock window
  • 6. Calculation of the knock an reference integral

 If the knock ratio reaches a certain value it is a knocking cycle

[3]

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  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 20

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Definition of the knock frequency

The knock frequency ist the percentage of knocking combustion cycles compared to the total number of all combustion cycles in a measured time. It is used to characterize the knocking intensity.

Experimental Setup

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  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 21

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Experimental Setup

Test gases

Component CH4 C2H6 C3H8 n-C4H10 i-C4H10 n-C5H12 i-C5H12 n-C6H14 N2 CO2 AVL-MN Mix 1

78.80 14.0 3.40 0.90 1.10 0.15 0.15 1.5 59

Mix 2

84.52 12.9 1.50 0.21 0.22 0.03 0.02 0.6 69

Mix 3

91.80 5.70 1.30 0.15 0.17 0.04 0.04 0.8 77

Mix 4

81.69 13.38 3.67 0.27 0.28 0.01 0.01 0.69 65

Mix 5

87.89 7.27 2.92 0.71 0.65 0.10 0.11 0.35 66

Mix 6

95.01 2.62 0.73 0.20 0.15 0.06 0.09 0.22 0.54 0.38 82

Mix 7

97.876 1.00 0.50 0.21 0.18 0.016 0.018 0.2 90

Mix 8

99.68 0.09 0.03 0.01 0.01 0.005 0.005 0.17 98

Mix 9

99.4 0.3 0.3 84

Mix 10

99.6 0.2 0.2 89

Mix11

99.8 0.1 0.1 94

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SLIDE 22
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 22

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts
  • Knocking
  • Methane Number
  • Service Methane Number
  • Experimental Setup
  • Experimental Procedure
  • Results
  • Conclusions

Outline

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SLIDE 23
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 23

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Boundary conditions

  • The engines normally used for fuel testing have a variable compression ratio.

Our test engines do not have this so we varied the charge air pressure pL.

  • We carried out the measurements for four different combustion positions,

characterised by the point where 50 % of the fuel is burnt (MFB50). These were MFB50 = 8, 10, 12 and 14 °CA aTDCF.

  • In pre-tests we determined the charge air pressures which produce knocking for

the chosen MFB50. For example for Mix1: 0.226, 0.203, 0.184 and 0.168 MPa.

  • Methane is very knock resistant. Even with the high compression ratio of 12.5

we had to increase the valve overlap and apply an exhaust pressure higher than the charge air pressure to achieve an internal exhaust gas recirculation which provokes knocking.

Experimental Procedure

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SLIDE 24
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 24

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts
  • 1. Preconditioning of oil and water to 85°C before starting the engine
  • 2. Running the engine at 2000rpm for five minutes at 0,5MPa IMEP(Indicated

Mean Effective Pressure) to heat through all components of the engine

  • 3. Increase the charge air pressure to the highest of the four ones
  • 4. Adjust the exhaust pressure to reach the chosen intake-exhaust pressure ratio
  • 5. Advance the ignition timing to early until the knock frequency exceeds 5%

6. Measurement of all values

Experimental Procedure

Test procedure

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  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 25

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts
  • 7. Decrease the charge air pressure until 0,5MPa IMEP is reached and run it for

five minutes

  • 8. Repeat point 3. to 7. for the other charge air pressures

For the analysis the average of 200 combustion cycles is taken. The procedure is repeated three times.

Experimental Procedure

Test procedure

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  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 26

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

y = 3E+07e‐1.185x y = 1E+12e‐1.993x y = 4E+10e‐1,79x 1 2 3 4 5 6 7 8 12 12.2 12.4 12.6 12.8 13 13.2 13.4 13.6 13.8 14 Kf [%] MFB50 [°CA]

0,23MPa boost pressure

20170803 20170803.1 20180803.2

  • Expon. (20170803)
  • Expon. (20170803.1)
  • Expon. (20180803.2)
  • For each charge air pressure and each of the three tests a correlation between

MFB50 and knock frequency is obtained.

Experimental Procedure

Evaluation

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SLIDE 27
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 27

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Experimental Procedure

Evaluation

  • This correlation is used to determine MFB50 for 5% knock frequency
  • In this example:
  • 1. Measurement: 13,17°CA aTDCF
  • 2. Measurement: 13,06°CA aTDCF
  • 3. Measurement: 12,74°CA aTDCF
  • The three measurements are averaged

 MFB50_m(5%KF)=12,99°CA  pL_m(5%KF)=0,23MPa

  • For the other three boost pressures it is done the same way
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SLIDE 28
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 28

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Experimental Procedure

Evaluation

  • This results in a correlation between MFB50 and charge air pressure for 5 %

knocking frequency

pL_m(5%KF)=f(MFB50_m(5%KF))

y = 1.3846e0.0388x 1 1.2 1.4 1.6 1.8 2 2.2 2.4 5 7 9 11 13 15 pL_m(5%KF) [bar] MFB50_m(5%KF) [°CA]

20170803 Mix5

20170803 Mix5

  • Expon. (20170803 Mix5)
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SLIDE 29
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 29

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts
  • From this correlation the pL at MFB50 = 8, 10, 12 and 14 °CA are taken.
  • This is also done for the reference gases with defined methane and hydrogen

content.

  • By definition the reference gases have a service methane number according to

their methane content.  So with all reference gases a diagramm pL vs MN for different MFB50 can be drawn.

Experimental Procedure

Evaluation

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SLIDE 30
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 30

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

y = 0,0096x + 1,3202 y = 0,0107x + 1,4189 y = 0,0119x + 1,5251 y = 0,0132x + 1,6393 1.8 2 2.2 2.4 2.6 2.8 3 3.2 50 60 70 80 90 100 110 pL_m(5%KF) SMN

pL_SMN

MFB50=8°CA MFB50=10°CA MFB50=12°CA MFB50=14°CA Linear (MFB50=8°CA) Linear (MFB50=10°CA) Linear (MFB50=12°CA) Linear (MFB50=14°CA)

Experimental Procedure

Evaluation

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  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 31

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

1.8 2 2.2 2.4 2.6 2.8 3 3.2 50 60 70 80 90 100 110 pL_m(5%KF) SMN

pL_SMN

Experimental Procedure

Evaluation

  • Now the SMN for a pL at different MFB50 can be looked up for every test

gas For example: pL(MFB50=8°CA) = 0.1888 MPa  SMN = 59.2 pL(MFB50=10°CA) = 0.2040 MPa  SMN = 58.1 pL(MFB50=12°CA) = 0.2205 MPa  SMN = 57.2 pL(MFB50=14°CA) = 0.2383 MPa  SMN = 56.4 MFB50 = 14°CA MFB50 = 12°CA MFB50 = 10°CA MFB50 = 8°CA

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SLIDE 32
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 32

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts
  • Knocking
  • Methane Number
  • Service Methane Number
  • Experimental Setup
  • Experimental Procedure
  • Results
  • Conclusions

Outline

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SLIDE 33
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 33

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Results

Engine 1 pL-SMN vs. AVL-MN

40 50 60 70 80 90 100 110 40 60 80 100 120 pL‐SMN AVL‐MN

MFB50=8°CA aTDCF

MFB50=8°CA x=y Linear (MFB50=8°CA) 40 50 60 70 80 90 100 110 40 60 80 100 120 pL‐SMN AVL‐MN

MFB50=10°CA aTDCF

MFB50=10°CA x=y Linear (MFB50=10°CA) 40 50 60 70 80 90 100 110 40 60 80 100 120 pL‐SMN AVL‐MN

MFB50=12°CA aTDCF

MFB50=12°CA x=y Linear (MFB50=12°CA) 40 50 60 70 80 90 100 110 40 60 80 100 120 pL‐SMN AVL‐MN

MFB50=14°CA aTDCF

MFB50=14°CA x=y Linear (MFB50=14°CA)

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  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 34

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Results

Engine 2 pL-SMN vs. AVL-MN

40 50 60 70 80 90 100 110 40 60 80 100 120 pL‐SMN AVL‐MN

MFB50=8°CA aTDCF

MFB50=8°CA x=y Linear (MFB50=8°CA) 40 50 60 70 80 90 100 110 40 60 80 100 120 pL‐SMN AVL‐MN

MFB50=10°CA aTDCF

MFB50=10°CA x=y Linear (MFB50=10°CA) 40 50 60 70 80 90 100 110 40 60 80 100 120 pL‐SMN AVL‐MN

MFB50=14°CA aTDCF

MFB50=14°CA x=y Linear (MFB50=14°CA) 40 50 60 70 80 90 100 110 40 60 80 100 120 pL‐SMN AVL‐MN

MFB50=12°CA aTDCF

MFB50=12°CA x=y Linear (MFB50=12°CA)

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SLIDE 35
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 35

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Results

Comparison of engine 1 and engine 2

40 50 60 70 80 90 100 110 40 60 80 100 120 pL‐SMN AVL‐MN

MFB50=8°CA aTDCF

MFB50=8°CA Engine 2 MFB50=8°CA Engine 1 x=y Linear (MFB50=8°CA Engine 2 ) Linear (MFB50=8°CA Engine 1) 40 50 60 70 80 90 100 110 40 60 80 100 120 pL‐SMN AVL‐MN

MFB50=10°CA aTDCF

MFB50=10°CA Engine 2 MFB50=10°CA Engine 1 x=y Linear (MFB50=10°CA Engine 2) Linear (MFB50=10°CA Engine 1) 40 50 60 70 80 90 100 110 40 60 80 100 120 pL‐SMN AVL‐MN

MFB50=12°CA aTDCF

MFB50=12°CA Engine 2 MFB50=12°CA Engine 1 x=y Linear (MFB50=12°CA Engine 2) Linear (MFB50=12°CA Engine 1) 40 50 60 70 80 90 100 110 40 60 80 100 120 pL‐SMN AVL‐MN

MFB50=14°CA aTDCF

MFB50=14°CA Engine 2 MFB50=14°CA Engine 1 x=y Linear (MFB50=14°CA Engine 2) Linear (MFB50=14°CA Engine 1)

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SLIDE 36
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 36

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts
  • Knocking
  • Methane Number
  • Service Methane Number
  • Experimental Setup
  • Experimental Procedure
  • Results
  • Conclusions

Outline

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SLIDE 37
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 37

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts
  • The Service Methane Number (SMN) was measured in two

engines for a range of operating conditions

  • The SMN shows a trend to be lower than the AVL-MN for

low AVL-MNs and higher for high AVL-MNs

  • Engine 1 shows slightly higher SMNs than Engine 2
  • The SMN is slightly higher for early MFB50
  • Further work is needed to reduce the deviations between

SMN and AVL-MN Conclusions

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  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 38

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Thank You

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  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 39

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Backup

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  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 40

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

[1] FVV (1971): Erweiterung der Energieerzeugung durch Kraftgase. Untersuchungen zur Übertragbarkeit der am CFR-Motor gefundenen Ergebnisse auf andere Motoren - Gültigkeitsbereich der Methanzahl. Teil 3. FVV-Heft 120. Frankfurt / Main. [2] https://www.kistler.com/ [3] KiBox To Go, Typ 2893A mit KiBox Cockpit, Manual

References

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  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 41

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

SMN of NG-Propane-mixtures at different engine speeds Service Methane Number

Source: [1], Fig. 5.13

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SLIDE 42
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 42

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Comparison of SMN on the CFR/RDH- and MWM-engine Service Methane Number

Source: [1], Fig. 5.15

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  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 43

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Service Methane Number of NG-Hydrogen-Propane mixtures

Source: [1], Fig. 5.44

Service Methane Number

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SLIDE 44
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 44

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Experimental Setup

Engine 1 and 2, testbed

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  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 45

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

1 2 3 4 5 6 7 8 9 10 11 AVL‐MN 59 69 77 65 66 82 90 98 84 89 94 MFB50=8°CA 56.5 71.3 83.1 69 62.6 84.1 92.5 101.9 88.4 93.6 91.5 MFB50=10°CA 54.2 70.1 80.9 67.2 61.1 82.2 90.8 101.7 88 94 92.9 MFB50=12°CA 51.6 69.2 78.8 65.9 59.8 80.9 89.2 102 88.2 95 94.8 MFB50=14°CA 49.8 67.9 76.4 64 58 78.7 87.3 101.6 87.7 95.3 95.9 20 40 60 80 100 120 MN

Comparison pL‐SMN AVL‐MN

Mix

Results of the methane number experiments

Engine 1 pL-SMN vs. AVL-MN

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SLIDE 46
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 46

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Results of the methane number experiments

Engine 2 pL-SMN vs. AVL-MN

1 2 3 4 5 6 7 8 9 10 11 AVL‐MN 59 69 77 65 66 82 90 98 84 89 94 MFB50=8°CA 50.7 67 75.2 60.4 59.2 80.4 89.6 101.1 88.4 89.5 96 MFB50=10°CA 50.6 67 73.9 60.5 58.1 79.4 89.3 97.8 86.9 88.1 93.1 MFB50=12°CA 50.6 67 72.7 60.5 57.2 78.5 89.1 95.7 85.5 86.8 90.4 MFB50=14°CA 50.7 67.1 71.7 60.8 56.4 77.8 89 93.9 84.3 85.8 88.1 20 40 60 80 100 120 MN

Comparison pL‐SMN AVL‐MN

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SLIDE 47
  • 22. August 2017 | Peter Eilts, Lennart Klare| Service Methane Number | Slide 47

Institute of internal combustion engines

  • Prof. Dr.-Ing. Peter Eilts

Results of the methane number experiments

1 2 3 4 5 6 7 8 9 10 11 MFB50=8°CA 5.8 4.3 7.9 8.6 3.4 3.7 2.9 0.8 4.1 ‐4.5 MFB50=10°CA 3.6 3.1 7 6.7 3 2.8 1.5 3.9 1.1 5.9 ‐0.2 MFB50=12°CA 1 2.2 6.1 5.4 2.6 2.4 0.1 6.3 2.7 8.2 4.4 MFB50=14°CA ‐0.9 0.8 4.7 3.2 1.6 0.9 ‐1.7 7.7 3.4 9.5 7.8 ‐6 ‐4 ‐2 2 4 6 8 10 12 SMN

Difference SMN Engine 1 ‐ Engine 2