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액체-기체 와류동축형 분사기의 자기-맥동에 대한 기체 밀도의 영향
Effect of Gas Density on Self-Pulsation in Liquid-Gas Swirl Coaxial Injector
안종현 ( Jonghyeon Ahn ) , 강철웅 ( Cheolwoong Kang ) , 안규복 ( Kyubok Ahn )
UCI I410-ECN-0102-2023-400-000933222

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.

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[자료제공 : 네이버학술정보]
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