Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

An Experimental Study on Performance of Second Throat Exhaust Diffusers of Different Configuration

2차목 초음속 디퓨저의 형상 변화에 따른 성능에 관한 실험적 연구

  • 전준수 (충남대학교 항공우주공학과) ;
  • 김완찬 (충남대학교 항공우주공학과) ;
  • 연해인 (충남대학교 항공우주공학과) ;
  • 김민상 (충남대학교 항공우주공학과) ;
  • 고영성 (충남대학교 항공우주공학과) ;
  • 한영민 (한국항공우주연구원 추진시험팀)
  • Received : 2013.07.26
  • Accepted : 2014.02.17
  • Published : 2014.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

Second throat supersonic exhaust diffusers (STEDs) were designed to simulate high-altitude conditions according to the normal-shock model. Experimental studies were performed on the STEDs to investigate how performance characteristics varied with the length and diameter of the STED using high-pressure nitrogen gas. The variation in performance due to length indicated that the performance of the STED could be very slightly improved by adjusting the diffuser inlet length ($L_d$), and it could be significantly improved by optimizing the second throat length ratio ($L_{st}/D_{st}$) and the divergence length ($L_s$). The starting and vacuum chamber pressures exhibited the highest level of performance near ($A_d/A_{st}$) of the design point.

본 연구에서는 고공 환경 모사를 위하여 2차목 초음속 디퓨저를 Normal Shock Model를 이용하여 설계/제작하였다. 2차목 디퓨저의 주요 설계 변수인 2차목 디퓨저의 길이와 직경 변화에 따른 성능 특성을 고찰하기 위하여, 상온 고압 질소 가스를 이용하여 디퓨저 성능 실험을 수행하였다. 다양한 디퓨저 길이에 따른 실험 결과 2차목 디퓨저의 시동 특성은 디퓨저 입구 길이($L_d$)가 증가함에 따라 아주 미세하게 향상되었으나, 2차목 디퓨저 길이비($L_{st}/D_{st}$)와 확대부 길이($L_s$)의 증가에 따라서는 크게 향상되었다. 또한 다양한 디퓨저 직경 변화에 따른 실험 결과, 시동 압력과 진공 챔버 압력은 모두 이론 설계 면적비($A_d/A_{st}$) 근처에서 가장 우수한 성능을 보였다.

Keywords

References

  1. Keenan, J. H., Neumann, E. P. and Lustwerk, F., "An Investigation of Ejector Design by Analysis and Experiment," Journal of Applied Mechanics, Vol. 72, 1950, pp. 299-309.
  2. Schafer, K. and Zimmermann, H., 2006, "Development and Operational Conditions of VINCI (R)Altitude Simulation Test Bench P4.1," 42nd AIAA/ASME/ SAE/ASEE Joint Propulsion Conference & Exhibit.
  3. Roschke, E. J., Massier, P. F. and Gier, H. L., 1962, "Experimental Investigation of Exhaust Diffuser for Rocket Engines," Technical Report No.32-210.
  4. Annamalai, K., Visvanathan, K., Sriramulu, V. and Bhaskaran, K. A., 1998, "Evaluation of the Performance of Supersonic Exhaust Diffuser Using Scaled Down Models," Experimental Thermal and Fluid Science, Vol. 17, pp. 217-229. https://doi.org/10.1016/S0894-1777(98)00002-8
  5. Annamalai, K., Satyanarayana, T., Sriramulu, V. and Bhaskaran, K. A., "Development of Design Methods for Short Cylindrical Supersonic Exhaust Diffuser," Experiment in Fluids, vol. 29, 2000, pp. 305-308. https://doi.org/10.1007/s003489900071
  6. James, E. A. J. and Theo, G. K., 2006, "Gas Dynamics," Pearson Prentice Hall.
  7. John D. A., 2003, "Modern Compressible Flow," Mc Graw Hill.
  8. Sung, H. G., Yeom, H. W., Yoon, S. K., Kim, S. J. and Kim, J. G., 2010, "Investigation of Rocket Exhaust Diffusers for Altitude Simulation," Journal of Propulsion and Power, Vol. 26, No. 2, pp. 240-247. https://doi.org/10.2514/1.46226
  9. Park, B. H., Lim, J. H. and Yoon, Y. S., 2008, "Fluid Dynamics in Starting and Terminating Transients of Zero-Secondary Flow Ejector," Heat and Fluid Flow, Vol 29, pp. 327-339. https://doi.org/10.1016/j.ijheatfluidflow.2007.06.008
  10. Park, S. H., Park, B. H., Lim, J. H. and Yoon, Y. S., 2008, "Improvement of Starting Performance in Supersonic Exhaust Diffuser with Second Throat for High Altitude Simulation," KSPE Spring Conference, pp. 321-327.
  11. Park, S. H., Park, B. H., Lim, J. H. and Yoon, Y. S., 2008, "Investigation of the Essential Parameters Governing Starting Characteristics in the Second Throat Exhaust Diffuser for High Altitude Simulation," KSME Conference, pp. 2642-2647.
  12. Lim, J. H., Park, B. H., Yoon, Y. S. and Lee, Y., 2008, "Parametric Investigation on the Essential Flow Factors Commanding Steady Operations of the Second Throat Exhaust Diffuser," 44th AIAA /ASME/SAE/ASEE Joint Propulsion Conference & Exhibit.
  13. Park, J. H, Lee, Y. S., Kim, J. I., Ko, Y. S., Kim, S. J., Kim, Y. and Kim, S.H., 2011, "Study on Design of Secondary Throat Supersonic Exhaust Diffusers," KSPE Fall Conference, pp. 881-884.
  14. Park, J. H., Jeon, J. S., Yu, I. S., Ko, Y. S., Kim, S. J., Kim, Y. and Han, Y. M., 2011, "Performance Characteristics of Secondary Throat Supersonic Exhaust Diffusers," KSPE Fall Conference, pp. 641-644.
  15. Kim, J. H, Yeoun, H. I., Kim, M. S., Jeon, J. S., Ko, Y. S. and Kim, S. H., 2012, "An Experomental Study on Performance of Second Throat Exhaust Diffuser according to Diameter of Second Throat," KSPE Fall Conference, pp. 871-874.

Cited by

  1. A Numerical Study on Flow and Heat Transfer Characteristics of Supersonic Second Throat Exhaust Diffuser for High Altitude Simulation vol.18, pp.5, 2014, https://doi.org/10.6108/KSPE.2014.18.5.070
  2. An Experimental Study on Startup Characteristics of a Center Body Diffuser for High Altitude Simulation vol.40, pp.2, 2016, https://doi.org/10.3795/KSME-B.2016.40.2.093