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http://dx.doi.org/10.15435/JILASSKR.2022.27.3.134

Effect of Gas Density on Self-Pulsation in Liquid-Gas Swirl Coaxial Injector  

Ahn, Jonghyeon (충북대학교 기계공학부)
Kang, Cheolwoong (충북대학교 기계공학부)
Ahn, Kyubok (충북대학교 기계공학부)
Publication Information
Journal of ILASS-Korea / v.27, no.3, 2022 , pp. 134-143 More about this Journal
Abstract
When a recess is applied to a swirl coaxial injector that uses liquid and gas propellants, a self-pulsation phenomenon in which the spray oscillates at regular intervals may occur. The phenomenon is caused by the interaction between the liquid and gas propellants inside the injector recess region. The propellants' kinetic energies are expected to affect significantly the spray oscillation. Therefore, cold-flow tests using helium as a gas-simulating propellant were conducted and compared with the results of the previous study using air. Dynamic pressure was measured in the injector manifold and frequency characteristics were investigated through the fast Fourier transform analysis. In the experimental environment, the helium density was about seven times lower than the air density. Accordingly, the intensity of pressure fluctuations was confirmed to be greater when air was used. At the same kinetic energy condition, the perturbation frequency was almost identical in the low flow rate conditions. However, as the flow rate increased, the self-pulsation frequency was higher when helium was used.
Keywords
Cold-Flow Test; Frequency Analysis; Liquid Rocket Engine; Self-Pulsation; Swirl Coaxial Injector;
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Times Cited By KSCI : 1  (Citation Analysis)
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