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Research Papers: Multiphase Flows

Experimental Study on Spray Characteristics of Gas-Centered Swirl Coaxial Injectors

[+] Author and Article Information
Jaehyoung Jeon, Soo Yong Lee

 Advanced Rocket Propulsion Team, Korea Aerospace Research Institute, 169-84 Gwahangro, Yuseong, Daejeon 305-333, South Korea

Moongeun Hong1

 Advanced Rocket Propulsion Team, Korea Aerospace Research Institute, 169-84 Gwahangro, Yuseong, Daejeon 305-333, South Koreaconquet@kari.re.kr

Yeoung-Min Han

 Propulsion Test Team, Korea Aerospace Research Institute, 169-84 Gwahangro, Yuseong, Daejeon 305-333, South Korea

1

Corresponding author.

J. Fluids Eng 133(12), 121303 (Dec 23, 2011) (7 pages) doi:10.1115/1.4005344 History: Received February 06, 2011; Revised October 12, 2011; Published December 23, 2011; Online December 23, 2011

Gas-centered swirl coaxial injectors have become an important subject of study for staged combustion rocket engines with hydrocarbon fuels. While these injectors are employed successfully in rocket engines, it is very rare to find the related research results as applicable to design data. An experimental study on spray characteristics of gas-centered swirl coaxial injectors has been performed. The effects of momentum flux ratio and recess length on the spray characteristics have been investigated by cold flow tests with a photographic technique. The liquid intact length L, which profoundly affects the global spray characteristics, decreases as the momentum flux ratio M increases. The critical momentum flux ratio Mc is introduced to identify the flow patterns as internal or external mixing in the injectors. Concerning the effect of the recess length lR, it is shown that the spray cone angle and the drop size decrease as lR increases.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of a gas-centered swirl coaxial injector

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Figure 2

Image processing procedures for the measurement of spray angle and breakup length (raw file → threshold level determination → boundary detection of liquid film)

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Figure 3

Evolution of spray configurations according to the momentum flux ratio at a fixed liquid velocity (lR/dg=1.5, ula=1.59m/s)

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Figure 4

Evolution of the liquid intact lengths according to the momentum flux ratio (♦: ula=1.32-2.12m/s)

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Figure 7

Evolution of SMD according to recess lengths (see Fig. 15 of Im [3], M = 50)

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Figure 6

Evolution of spray cone angles according to recess lengths

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Figure 5

Evolution of the spray cone angles according to the momentum ratio at fixed liquid velocities: (a) lR/dg=1.0, (b) lR/dg=1.5, (c) lR/dg=2.0, (d) lR/dg=2.5

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