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Research Papers: Gas Turbines: Microturbines and Small Turbomachinery

Experimental Study of Oblong Exhaust Ejectors With Multiring Oblong Entraining Diffusers

[+] Author and Article Information
Qi Chen

Department of Mechanical and Materials Engineering, Queen’s University, Kingston, ON, K7L 3N6, Canadachenqi@me.queensu.ca

A. M. Birk

Department of Mechanical and Materials Engineering, Queen’s University, Kingston, ON, K7L 3N6, Canadabirk@me.queensu.ca

J. Eng. Gas Turbines Power 131(6), 062302 (Jul 13, 2009) (9 pages) doi:10.1115/1.2943195 History: Received February 23, 2008; Revised March 28, 2008; Published July 13, 2009

This paper presents experimental data for the performance of two oblong, straight, air-air ejectors with four-ring oblong entraining diffusers. The effects of inlet swirl angle, nozzle diameter, and flow temperature on the ejector pumping, backpressure, wall pressure distribution, diffuser pressure recovery, and surface film cooling effectiveness were studied. The experiments were carried out on a hot gas wind tunnel that could provide primary mass flow rates up to 2.2kgs at ambient temperature and 1.8kgs at 500°C. Velocity, pressure, and temperature were measured in the annulus upstream of the primary nozzle, on the mixing tube and diffuser walls, at the diffuser gap inlets, and at the diffuser exit. A comparison between the performance of the oblong ejector and a round ejector indicated that for a short length ejector, the oblong ejector provided better overall performance in terms of pumping and velocity and temperature distributions.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Dimensions (in mm) of Ejector 4 (E-4)

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Figure 2

Dimensions (in mm) of Ejector 7 (E-7)

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Figure 3

Dimensions (in mm) of Ejector 3 (E-3) (10)

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Figure 4

Schematic of instrumentation

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Figure 5

Photograph of oblong ejector with four-ring entraining diffuser

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Figure 6

Inlet gap velocity profile of the first diffuser ring, flat side, φ=0deg, cold flow

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Figure 7

Exp. velocity contours of the oblong nozzle exit for Ejector 4, cold flow, φ=0deg

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Figure 8

Exp. velocity contours of the round nozzle exit for Ejector 3, cold flow, φ=30deg

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Figure 9

Exp. velocity contours of the oblong nozzle exit for Ejector 4, cold flow, φ=30deg

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Figure 10

Exp. velocity contours at the diffuser exit for Ejector 4, hot flow: (a) φ=0deg; (b) φ=20deg

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Figure 11

Wall pressure distribution along the mixing tube and diffuser for Ejector 4: (a) cold, φ=0deg; (b) cold and hot, φ=10deg; (c) cold, φ=20deg; (d) cold, φ=30deg; For Ejector-7: (e) cold and hot, φ=0deg; (f) cold and hot, φ=20deg

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Figure 12

Diffuser pressure recovery as a function of swirl angle for Ejector 4 and Ejector 7, cold and hot flows

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Figure 13

Pumping ratios as a function of swirl angle for Ejector 4, Ejector 7 and Ejector 3, cold and hot flows: (a) Φ2nd, (b) Φ3rd, and (c) Φt

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Figure 14

Backpressure coefficient as a function of swirl angle for Ejector 4, Ejector 7, and Ejector 3, cold and hot flows

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