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research-article

Effects of Transient Heat Transfer on Compressor Stability

[+] Author and Article Information
Andras Kiss

Gas Turbine Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
akiss@mit.edu

Zoltan Spakovszky

Gas Turbine Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
zolti@mit.edu

1Corresponding author.

ASME doi:10.1115/1.4041290 History: Received August 02, 2018; Revised August 21, 2018

Abstract

The effects of heat transfer between the compressor structure and primary gas path flow on compressor stability are investigated during hot engine re-acceleration transients. A mean line analysis of an advanced, high-pressure ratio compressor is extended to include the effects of heat transfer on both stage matching and blade row flow angle deviation. A lumped capacitance model is used to compute the heat transfer of the compressor blades, hub, and casing to the primary gas path. The inputs to the compressor model with heat transfer are based on a combination of full engine data, compressor test rig measurements, and detailed heat transfer computations. Non-adiabatic transient calculations show a 8.0 point reduction in stall margin from the adiabatic case, with heat transfer predominantly altering the transient stall line. 3.4 points of the total stall margin reduction are attributed to the effect of heat transfer on blade row deviation, with the remainder attributed to stage re-matching. Heat transfer increases loading in the front stages and destabilizes the front block. Sensitivity studies show a strong dependence of stall margin to heat transfer magnitude and flow angle deviation at low speed, due to the effects of compressibility. Computations for the same transient using current cycle models with bulk heat transfer effects, only capture 1.2 points of the 8.0 point stall margin reduction. Based on this new capability opportunities exist early in the design process to address potential stability issues due to transient heat transfer.

Copyright (c) 2018 by ASME
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