Aerodynamics of Compressors and Turbines (AE 651) Autumn Semester - - PowerPoint PPT Presentation

aerodynamics of compressors and turbines
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Aerodynamics of Compressors and Turbines (AE 651) Autumn Semester - - PowerPoint PPT Presentation

Aerodynamics of Compressors and Turbines (AE 651) Autumn Semester 2009 Instructor : Bhaskar Roy Professor, Aerospace Engineering Department I.I.T., Bombay e-mail : aeroyia@aero.iitb.ac.in 1 Axial Turbines Introduction Gas Turbine engine


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SLIDE 1

Aerodynamics

  • f

Compressors and Turbines

(AE 651)

Autumn Semester 2009

Instructor : Bhaskar Roy Professor, Aerospace Engineering Department I.I.T., Bombay e-mail : aeroyia@aero.iitb.ac.in

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SLIDE 2

AE 651 - Prof Bhaskar Roy, IITB Lect - 11

Axial Turbines

Introduction

Gas Turbine engine derives its name from the turbine, which is at the heart of the work producing mechanism of the engine. A fluid with large kinetic energy content is allowed to hit a freely rotating set of blades, certain amount

  • f energy can be extracted from the passing fluid

as shaft power

Principle

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SLIDE 3

AE 651 - Prof Bhaskar Roy, IITB

Axial Turbines

i) The compressor, which raises the internal energy content of the fluid before it goes into the combustor, ii) A propeller to create the propulsive thrust Shaft energy from the turbine is used to run:

Lect - 11

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SLIDE 4

AE 651 - Prof Bhaskar Roy, IITB Lect - 11

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Axial Turbines

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SLIDE 5

AE 651 - Prof Bhaskar Roy, IITB

Axial Turbines

Lect - 11

(a) Multi-stage HP + LP turbine layout

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(b) Elemental stage

Lect - 11

Axial Turbines

AE 651 - Prof Bhaskar Roy, IITB

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AE 651 - Prof Bhaskar Roy, IITB

Axial Turbines

Lect - 11

Thermodynamic Properties in Turbine in a GTE Cycle

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03 is the delivery from C.C.

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AE 651 - Prof Bhaskar Roy, IITB

Axial Turbines

Lect - 11

High energy flow is first accelerated and made to impinge on the rotor blade with high momentum and then made to take huge turn through the passage between the blades.

Impulse turbines Reaction turbines

The flow is accelerated through the rotor blades by making an expanding (converging) curved nozzle passage, in addition to the large turning. Jet effect creates a reaction as per Newton’s 3rd law of motion.

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AE 651 - Prof Bhaskar Roy, IITB

Axial Turbines

Lect - 11

Axial flow turbine 2-D cascade velocity distribution

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AE 651 - Prof Bhaskar Roy, IITB Lect - 11

Axial flow turbine 2-D cascade velocity diagram Axial Turbines Impulse turbines V2=V3 reaction turbines V3>V2

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SLIDE 11

AE 651 - Prof Bhaskar Roy, IITB

Axial Turbines

Lect - 11

T-s of Axial Turbine Stage

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SLIDE 12

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Axial Turbines h-s Diagram of Axial Turbine Stage

AE 651 - Prof Bhaskar Roy, IITB Lect - 11