A Computational Procedure for Diffuser-Combustor Flow Interaction Analysis

[+] Author and Article Information
K. C. Karki, V. L. Oechsle, H. C. Mongia

Allison Gas Turbine Division, General Motors Corporation, Indianapolis, IN 46206

J. Eng. Gas Turbines Power 114(1), 1-7 (Jan 01, 1992) (7 pages) doi:10.1115/1.2906301 History: Received December 21, 1989; Online April 24, 2008


This paper describes a diffuser-combustor flow interaction analysis procedure for gas turbine combustion systems. The method is based on the solution of the Navier–Stokes equations in a generalized nonorthogonal coordinate system. The turbulence effects are modeled via the standard two-equation (k-ε) model. The method has been applied to a practical gas turbine combustor-diffuser system that includes support struts and fuel nozzles. Results have been presented for a three-dimensional simulation, as well as for a simplified axisymmetric simulation. The flow exhibits significant three-dimensional behavior. The axisymmetric simulation is shown to predict the static pressure recovery and the total pressure losses reasonably well.

Copyright © 1992 by The American Society of Mechanical Engineers
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