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A numerical study of high pressure turbine forced response in the presence of damaged nozzle guide vanes

Published online by Cambridge University Press:  03 February 2016

L.di Mare ,
M. Imregun ,
A. D. Smith  and
R. Elliott
L.di Mare
Affiliation:
Vibration UTC, Mechanical Engineering Department, Imperial College London, London
M. Imregun
Affiliation:
Vibration UTC, Mechanical Engineering Department, Imperial College London, London
A. D. Smith
Affiliation:
Rolls-Royce, Turbines – Design Engineering, Derby, UK
R. Elliott
Affiliation:
Rolls-Royce, Turbines – Design Engineering, Derby, UK
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Abstract

This paper reports results from numerical computations of low engine order and blade-passing forced response on the rotor of a high pressure turbine due to severe damage to a single nozzle guide vane. The computations are performed using a time-domain, nonlinear viscous compressible flow simulation code. The flow and the levels of forcing for a few selected modes are compared for the undamaged and the damaged configurations. The results show that the response in various modes is affected to a different extent by the damage. The main blade-passing response was found to be largely unaffected, if not marginally reduced. On the other hand, the vibration levels for some modes were seen to be up to eight times higher because of the low-order excitation harmonics created by the damaged passage.

Type
Research Article
Information
The Aeronautical Journal , Volume 111 , Issue 1125 , November 2007 , pp. 751 - 757
Copyright
Copyright © Royal Aeronautical Society 2007 

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