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A Study on Dynamic Characteristics of Gas Centered Swirl Coaxial Injector with Acoustic Excitation by Varying Momentum Flux Ratio

운동량 플럭스 비의 변화에 따른 기체 중심 스월 동축형 분사기의 기체 가진 동특성 연구

  • 이정호 (서울대학교 기계항공공학부) ;
  • 박구정 (서울대학교 기계항공공학부) ;
  • 윤영빈 (서울대학교 기계항공공학부, 항공우주 신기술연구소)
  • Received : 2015.09.06
  • Accepted : 2015.09.21
  • Published : 2015.09.30

Abstract

Combustion instability is critical problem in developing liquid rocket engine. There have been many efforts to solve this problem. In this study, the method was sought through the injector as part of these efforts to suppress combustion instability. If the injector can suppress the disturbance coming from the supply line as a kind of buffer it will serve to reduce combustion instability. Especially we target at gas propellant oscillation in gas-centered swirl coaxial injector. The phenomenon is simulated with acoustic excitation of speaker. The film thickness response at injector exit was measured by using a liquid film electrode. Also the response of spray to the disturbance was observed by high-speed photography. Gas-liquid momentum flux ratio and the frequency of feeding gas oscillation were changed to investigate the effect of these experimental parameters. The trend of response by varying these parameters and the cause of weak points was studied to suggest the better design of injector for suppressing combustion instability.

Keywords

References

  1. Harrje, D. J. and Reardon, F. H., "Liquid Propellant Rocket Instability", NASA SP-194, 1972.
  2. Schoyer, H. F. R. et al., "Combustion Instability in Liquid Rocket Engines", ESA, 1993.
  3. Bazarov, V. G. and Yang, V., "Liquid Propellant Rocket Engine Injector Dynamics", Journal of Propulsion and Power, Vol. 14, No. 5, 1998, pp. 797-806. https://doi.org/10.2514/2.5343
  4. Ismailov, M. and Heister, S. D., "Dynamic Response of Rocket Swirl Injectors", Journal of Propulsion and Power, Vol. 27, No. 2, 2011.
  5. Matas, J., Hong, M. and Cartellier, A., Physics of fluids 26, 042108, 2014. https://doi.org/10.1063/1.4871395
  6. Kim, H., Chung, Y., Jeong, S., Lee, I. and Yoon, Y., "Experimental Study on the Dynamic Characteristics of Open Type Swirl Injector with Varying Swirl Chamber Length", 2014 KSPE Spring Conference, 2014, pp. 235-238.
  7. Suyari, M. and Lefebvre, A. H., "Film Thickness Measurements in a Simplex Swirl Atomizer", Journal of Propulsion and Power, Vol. 2, No. 6, 1986, pp. 528-533. https://doi.org/10.2514/3.22937
  8. Kim, S., Khil, T., Kim, D. and Yoon, Y., "Effect of geometric parameters on the liquid film thickness and air core formation in a swirl injector", Measurement Science and Technology, Vol. 20, No. 1, 2009, p. 015403. https://doi.org/10.1088/0957-0233/20/1/015403
  9. 'Bayvel, L. and Orzechowski, Z., "Liquid Atomization", 1993.