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RESEARCH PAPERS: Gas Turbines: Turbomachinery

A Numerical Investigation of the Startup Transient in a Wave Rotor

[+] Author and Article Information
D. E. Paxson

NASA Lewis Research Center, Cleveland, OH 44135

J. Eng. Gas Turbines Power 119(3), 676-682 (Jul 01, 1997) (7 pages) doi:10.1115/1.2817039 History: Received February 01, 1996; Online November 19, 2007

Abstract

The startup process is investigated for a hypothetical four-port wave rotor, envisioned as a topping cycle for a small gas turbine engine. The investigation is conducted numerically using a multi-passage, one-dimensional CFD based wave rotor simulation in combination with lumped volume models for the combustor, exhaust valve plenum, and rotor center cavity components. The simulation is described and several startup transients are presented which illustrate potential difficulties for the specific cycle design investigated. In particular it is observed that, prior to combustor light-off, or just after, the flow through the combustor loop is reversed from the design direction. The phenomenon is demonstrated and several possible modification techniques are discussed that avoid or overcome the problem.

Copyright © 1997 by The American Society of Mechanical Engineers
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