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

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

DOI QR Code

A Study on Performance Characteristics of Second Throat Exhaust Diffuser with Back Pressure

고공환경 모사용 이차목 디퓨저의 배압에 따른 성능 특성

  • Kim, Wan Chan (Dept. of Aerospace Engineering, Chungnam Nat'l Univ.) ;
  • Yu, I Sang (Dept. of Aerospace Engineering, Chungnam Nat'l Univ.) ;
  • Kim, Tae Woan (Dept. of Aerospace Engineering, Chungnam Nat'l Univ.) ;
  • Park, Jin Soo (Dept. of Aerospace Engineering, Chungnam Nat'l Univ.) ;
  • Ko, Young Sung (Dept. of Aerospace Engineering, Chungnam Nat'l Univ.) ;
  • Kim, Min Sang (Aerospace R&D Center, Hanwha Co.)
  • 김완찬 (충남대학교 항공우주공학과) ;
  • 유이상 (충남대학교 항공우주공학과) ;
  • 김태완 (충남대학교 항공우주공학과) ;
  • 박진수 (충남대학교 항공우주공학과) ;
  • 고영성 (충남대학교 항공우주공학과) ;
  • 김민상 ((주)한화/기계 항공우주연구소)
  • Received : 2016.09.19
  • Accepted : 2017.06.20
  • Published : 2017.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

Experimental and numerical studies were performed to investigate the performance and internal flow characteristics of a supersonic second throat exhaust diffuser (STED) with back pressure ($P_a$). An ejector system was used to vary the back pressure ($P_a$) conditions. The operating gas for the STED and the ejector was high pressure nitrogen at room temperature. When the back pressure ($P_a$) at a constant nozzle inlet pressure $P_0$) decreases, the pressure recovery location moves downstream. If the pressure ratio $P_0/P_a$) is the same, even if the nozzle inlet pressures $P_0$) are different, the diffuser's internal flow pattern and starting pressure ratio ($(P_0/P_a)_{st}$) are almost the same.

본 연구에서는 이차목 디퓨저의 배압에 따른 특성과 디퓨저 내부의 유동을 확인하기 위해서 실험과 수치해석을 통하여 살펴보았다. 디퓨저의 배압($P_a$)조건을 모사하기 위해 이젝터를 사용하였으며, 디퓨저와 이젝터는 상온 고압기체질소를 사용하였다. 그 결과, 노즐전단압력($P_0$)이 동일할 때 배압($P_a$)을 낮추어 압력비($P_0/P_a$)를 높게 할수록 압력회복이 디퓨저 후단에서 이루어짐을 확인하였다. 노즐전단압력($P_0$)이 다르더라도 압력비($P_0/P_a)$가 동일하다면 디퓨저 내부의 유동특성이 거의 동일함을 확인하였으며, 시동압력비($(P_0/P_a)_{st}$) 또한 일치함을 확인하였다.

Keywords

References

  1. Roschke, E. J., Massier, P. F. and Gier, H. L., 1962, "Experimental Investigation of Exhaust Diffuser for Rocket Engines," Technical Report No. 32-210.
  2. James, E. A. J. and Theo, G. K., 2006, "Gas Dynamics," Pearson Prentice Hall.
  3. John D. A., 2003, "Modern Compressible Flow," Mc Graw Hill.
  4. 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
  5. 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
  6. 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.
  7. 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.
  8. 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.
  9. 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
  10. Annamalai, K., Satyanarayana, T., Sriramulu, V. and Bhaskaran, K. A., 2000, "Development of Design Methods for Short Cylindrical Supersonic Exhaust Diffuser," Experiment in Fluids, vol. 29, pp. 305-308. https://doi.org/10.1007/s003489900071
  11. 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.
  12. 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.
  13. 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.
  14. Jeon, J. S., Kim, W. C., Yeoun, H. I., Kim, M. S., Ko, Y. S. and Han, Y. M., 2014, "An Experimental Study on Performance of Second Threat Exhaust Diffusers of Different Configuration," Trans. Korean Soc. Mech. Eng. B, Vol. 38, No. 4, pp. 279-288. https://doi.org/10.3795/KSME-B.2014.38.4.279
  15. Kim, M. S., Kim, T. W., Lee, J. H., Ko, Y. S. and Kim, S. H., 2014, "An Experimental Study on Starting Characteristics of Second Throat Exhaust Diffuser According to Back Pressure," KSPE Fall conference, pp. 619-625.