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RESEARCH PAPERS: Gas Turbines: Combustion and Fuels

Flow Behavior With an Oscillating Motion of the Impinging Jet in a Dump Diffuser Combustor

[+] Author and Article Information
S. Honami, T. Shizawa

Department of Mechanical Engineering, Science University of Tokyo, Tokyo, 162, Japan

A. Sato

Aero-Engine and Space Operations, Ishikawajima-Harima, Heavy Industries Co., Ltd., Tokyo, Japan

H. Ogata

Jet Engine Division, Kawasaki Heavy Industries Ltd., Kobe, Japan

J. Eng. Gas Turbines Power 118(1), 65-71 (Jan 01, 1996) (7 pages) doi:10.1115/1.2816551 History: Received February 19, 1994; Online November 19, 2007

Abstract

This paper presents flow behavior with an oscillating motion of an impinging jet upon a flame dome head and its reattachment to the casing wall, when a distorted flow is provided at the inlet of the dump diffuser combustor. A Laser-Doppler Velocimeter was used for the measurements of the time-averaged flow within a sudden expansion region. A surface pressure fluctuation survey on the flame dome head and flow visualization by a smoke wire technique with a high-speed video camera were conducted from the viewpoint of the unsteady flow features of the impinging jet. There exists a high-vorticity region at the jet boundary, resulting in the production of turbulence kinetic energy. In particular, higher vorticity is observed in the higher velocity side of the jet. The jet near the dome head has favorable characteristics about the flow rate distribution into the branched channel. Reynolds shear stress and turbulence energy are produced near the reattachment region. The jet has an oscillating motion near the dome head with asymmetric vortex formation at the jet boundary.

Copyright © 1996 by The American Society of Mechanical Engineers
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