Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Effect of Gas Density on Self-Pulsation in Liquid-Gas Swirl Coaxial Injector

액체-기체 와류동축형 분사기의 자기-맥동에 대한 기체 밀도의 영향

  • 안종현 (충북대학교 기계공학부) ;
  • 강철웅 (충북대학교 기계공학부) ;
  • 안규복 (충북대학교 기계공학부)
  • Received : 2022.07.14
  • Accepted : 2022.08.15
  • Published : 2022.09.30
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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

Acknowledgement

본 논문은 과학기술정보통신부의 재원으로 한국연구재단(NRF-2021M1A3B8077772, NRF-2021M1A3B9095872) 및 한국항공우주연구원(KARI-FR21C00)의 지원을 받아서 수행되었으며, 이에 감사드립니다.

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