DOI QR코드

DOI QR Code

Study on the Radial Diffuser of Multistage High Pressure Pump

고압 다단 펌프의 레이디얼 디퓨저에 대한 연구

  • Kim, Deok Su (Research and Development 2Team, Hyosung Goodsprings, Inc.) ;
  • Mamatov, Sanjar (Research and Development 2Team, Hyosung Goodsprings, Inc.) ;
  • Park, Warn Gyu (School of Mechanical Engineering, Pusan Nat'l Univ.)
  • Received : 2016.06.15
  • Accepted : 2016.09.20
  • Published : 2016.11.01

Abstract

In this study, a high-pressure multistage pump used in the combined cycle power plants is analyzed. The pump performance characteristics (differential head and efficiency) are numerically analyzed for different shapes of the radial diffuser. The design variables selected for the radial diffuser are, number of vanes, diameter ratio ($D_4/D_3$), return channel outlet angle(${\alpha}_6$), and pressure recovery factor ($C_p$). The numerical analysis results showed that the differential head and efficiency are the highest when the diameter ratio is the highest. Further, it was observed that the differential head was lower when the return channel outlet angle was $60^{\circ}$ than when it was $90^{\circ}$, because of pre-swirl at the diffuser outlet.

본 연구에서는 복합화력 화력 발전소용 고압 다단펌프의 레이디얼 디퓨저 형상에 따른 펌프의 성능(양정, 효율)변화를 수치 해석적으로 분석하였다. 레이디얼 디퓨저 설계 변수는 크게 디퓨저 베인수, 디퓨저 외경비($D_4/D_3$), 리턴채널 출구각도(${\alpha}_6$), 압력회복계수($C_p$) 등으로 선정하였다. 수치해석 결과 디퓨저 외경비가 큰 경우 양정 및 효율이 가장 크게 예측되었으며, 리턴채널의 출구각도(${\alpha}_6$)가 60도인 경우 디퓨저 출구에서의 Pre-Swirl로 인해 출구각도가 90도인 것에 비해 양정이 저하되는 것을 알 수 있다.

Keywords

References

  1. Yoo, I. S., Park, M. R., Hwang, S. C., Kim, S. K. and Yoon, E. S., 2012, "Development of Vertical Barrel Type Multistage Pump," Journal of Fluid Machinery, Vol. 15, No. 1, pp. 13-20. https://doi.org/10.5293/kfma..2012.15.1.013
  2. Oh, H. W., "Hydrodynamic Characteristics of Vaned-Diffuser and Return-Channel for a Multistage Centrifugal Pump," Journal of Fluid Machinery, Vol. 14, No. 6, pp. 54-60.
  3. Miyano, T. K., 2008, "Return Vane Installed Multistage Centrifugal Pump," International Journal of Fluid Machinery and Systems, Vol. 1, No. 1.
  4. Roclawski, H., 2006, "Numerical Simulation of a Radial Multistage Centrifugal Pump," American Institute of Aeronautics and Astronautics.
  5. Roche-Carrier, N. L., Ngoma, G. D. and Ghiei, W., 2013, "Numerical Investigation of a First Stage of a Multistage Centrifugal Pump: Impeller, Diffuser with Return Vanes and Casing," Hindawi Publishing Corporation ISRN Mechanical Engineering, Article ID 578072.
  6. Tiwari, N., Kumar, K. and Kumar, D., 2016, "Analytical and Experimental Analysis of the High Pressure Boiler Feed Pump," International Conference on Innovations in Automation and Mechatronics Engineering.
  7. Gulich, J. F., 2010, "Centrifugal Pumps".

Cited by

  1. Analysis of unsteady radial forces of multistage centrifugal pump with double volute vol.35, pp.3, 2018, https://doi.org/10.1108/EC-12-2016-0445