Unsteady Turbine Aerodynamics - from the Laboratory to the Engine


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Table of contents

Unsteady Turbine Aerodynamics - from the Laboratory to the Engine

The Jet Engine

Some facts:

Low Pressure Turbine Blades

Secondary Flows

Motivation

Efficiency Breakdown of the turbine

The Boundary Layer

Description of Suction Surface flow

Aerodynamic Load

Effect of Diffusion/Lift on Bubble

Wind Tunnel and Cascade

Higher Lift with Steady Flow– the cost

Unsteady Inflow: Wakes

Wake Distortion

Cascade Simulation

Simulation

Turbulent spots formed by wakes

Looking down…

Real turbulent spots

Details of turbulent spots

PowerPoint Presentation

Increased Lift Profiles

Benefits of wakes

Can we do better?

Aft Loaded Profiles

Slide 27

Profile Efficiencies

Cascade Results

Laboratory Aft Loading Works

Comparison: Laboratory and Engine

Rotors and Stators

Engine: Multistage Interactions

Results from 715 Engine (NGV3)

Things get more complicated in the Engine!

Beating: Proof of Multistage interactions

Effect of Wake Frequency

Slide 38

The Engine: Turbine Efficiency

Conclusions

Slide 41

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