Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
권호 표지

Effect of Backhole on Spray Characteristics of Swirl Injectors in Liquid Propellants Rocket Engine

액체 추진제용 로켓 엔진 스월 인젝터의 백홀로 인한 분무 특성 연구

  • 황성하 (서울대학교 기계항공공학부 대학원 로켓추진연구실) ;
  • 윤영빈 (서울대학교 기계항공공학부)
  • Published : 2003.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

"Backhole" is a new geometric parameter and is defined as an extra empty volume which is located behind the tangential entries at the rear part of the vortex chamber in the swirl injector. Backhole makes a difference to the spray characteristics of swirl injectors such as the spray angle, SMD, the mixing characteristics and so on. To find its characteristics, experiments are conducted by using a stroboscopic photography, a PDPA apparatus and a mechanical patternator. With the backhole, the mass flow rate of the swirl injector is increased and the center region of the injected flow has more large volume than that of without the backhole. Also the cone angle can be controlled by the backhole, so that the mixing efficiencies of swirl injectors are changed. Based on cold-flow tests, the swirl injector with the backhole may improve its performance.rformance.

백홀은 스월 인젝터의 새로운 기하학적인 설계요소로서 스월 인젝터 내부에 있는 와류실의 연직 주입구후방에 위치하는 추가적인 빈 공간을 총칭한다. 이 백홀은 분무각이나 평균액적지름(SMD), 혼합 특성과 같은 스월 인젝터의 분무 특성을 변화시키게 된다. 이러한 백홀의 특성을 알아보기 위하여 직$.$간접 촬영 기법 및 PDPA와 기계적 유량 포집기 등을 사용하여 수류실험을 수행하였다. 백홀이 스월 인젝터 내에 존재하게 되면 단위시간당 유량이 증가하게 되어 분무되는 유동의 중심부가 강화된다. 또한 백홀은 스월 인젝터의 유동 분무각을 조절할 수 있게 하고 그로 인하여 혼합 효율을 변화시킨다.

Keywords

References

  1. Bazarov, V. G., 'Hydraulics of Swirl Propellant Injectors,' 9th Annual Symposium on Propulsion, 1997
  2. Pazhi, D. G. and Galustov, V. S., Atomization of Liquids, Russia
  3. Hardalupas, Y. and Whitelaw, J. H., 'Characteristics of Spray Produced by Coaxial Airblast Atomizers,' Journal of Propulsion and Power, Vol.10, No.4, 1994
  4. Taylor, G. I., et al., 'The Boundary Layer in the Converging Nozzle of a Swirl Atomizer,' Quart. J. Mech. Appl. Math., Vol. 3, pp. 129-139, 1950 https://doi.org/10.1093/qjmam/3.2.129
  5. Bazarov, V. G., 'Liquid Flow Pulsation Damping in Feed Lines and Injectiors of Liquid Propellant Rocket Engines,' IAF-93-S.2.468, 1993
  6. 황성하, 설재훈, 정원호, 한풍규, 윤영빈, 'Effects of Backhole on Hydraulics of Liquid Rocket Swirl Coaxial Injector,' Proceedings of the 2nd National Congress on Fluids Engineering, pp.287-290, 2002
  7. Rupe, Jack H., 'The Liquid-Phase Mixing of a Pair of Impinging Streams,' Progress Report No.20-195, Jet Propulsion Laboratory, 1953
  8. Rubinsky, Vitaly, R., 'Combustion Instability in the RD-0110 Engine,' AIAA-1994, Liquid Rocket Engine Combustion Instability, Vol.169, Progress in Astronautics and Aeronautics, edited by Vigor Yang and William E. Anderson, Pennsylvania State University
  9. Couto, H. S., Carvalho, J. A. Jr. and Bastos-Netto, D., 'Theoretical Formulation for Sauter Mean Diameter of Pressure-Swirl Atomizers,' Journal of Propulsion and Power, Vol. 13, No.5, 1997
  10. Ramamurthi, K., Tharakan, T. J. and Balakrishnan, M., 'Flow Transition in Swirled Liquid Sheets,' AIAA Journal, Vol.36, No.3, 1998
  11. Inamura, T., Miyata, K., Tamura, H., and Sakamoto, H., 'Spray Characteristics of Swirl Coaxial Injector and Its Modeling,' AIAA 2001-3570, 2001
  12. Lefebvre, Arthur H., Atomization and Sprays, Hemisphere Publishing Corporation, 1989
  13. Bazarov, V. G., 'Liquid Propellant Rocket Engine Injectors,' Invited Lecture of V. Bazarov, edited by Rocket Propulsion Lab., Seoul National University, 2002
  14. Bazarov, V. G., 'Self-Pulsations in Coaxial Injectors with Central Swirl Liquid Stage,' AIAA 95-2358, 1995