International Journal of Fluid Machinery and Systems

한국유체기계학회 (Korean Society for Fluid machinery)
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The Effect of Different Inflows on the Unsteady Hydrodynamic Characteristics of a Mixed Flow Pump

  • Yun, Long (School of Mechanical Engineering, Shanghai Jiao Tong University) ;
  • Dezhong, Wang (School of Mechanical Engineering, Shanghai Jiao Tong University) ;
  • Junlian, Yin (School of Mechanical Engineering, Shanghai Jiao Tong University) ;
  • Youlin, Cai (Marine Design & Research Institute of China) ;
  • Chao, Feng (Marine Design & Research Institute of China)
  • 투고 : 2016.12.15
  • 심사 : 2017.04.17
  • 발행 : 2017.06.30
⟨ 이전 논문 다음 논문 ⟩

초록

The problem of non-uniform inflow exists in many practical engineering applications, such as the elbow suction pipe of waterjet pump and, the channel head of steam generator which is directly connect with reactor coolant pump. Generally, pumps are identical designs and are selected based on performance under uniform inflow with the straight pipe, but actually non-uniform suction flow is induced by upstream equipment. In this paper, CFD approach was employed to analyze unsteady hydrodynamic characteristics of reactor coolant pumps with different inflows. The Reynolds-averaged Naiver-Stokes equations with the $k-{\varepsilon}$ turbulence model were solved by the computational fluid dynamics software CFX to conduct the steady and unsteady numerical simulation. The numerical results of the straight pipe and channel head were validated with experimental data for the heads at different flow coefficients. In the nominal flow rate, the head of the pump with the channel head decreases by 1.19% when compared to the straight pipe. The complicated structure of channel head induces the inlet flow non-uniform. The non-uniformity of the inflow induces the difference of vorticity distribution at the outlet of the pump. The variation law of blade to blade velocity at different flow rate and the difference of blade to blade velocity with different inflow are researched. The effects of non-uniform inflow on radial forces are absolutely different from the uniform inflow. For the radial forces at the frequency $f_R$, the corresponding amplitude of channel head are higher than the straight pipe at $1.0{\Phi}_d$ and $1.2{\Phi}_d$ flow rates, and the corresponding amplitude of channel head are lower than the straight pipe at $0.8{\Phi}_d$ flow rates.

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과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

참고문헌

  1. SUN, H.-h., CHENG, P.-d., and MIAO, H.-x., 2010, "The third generation of nuclear power technology AP1000," Beijing: China Electric Power Press.
  2. Cheng, H., Li, H., Yin, J., Gu, X., Hu, Y., and Wang, D., "Investigation of the distortion suction flow on the performance of the canned nuclear coolant pump."
  3. Brennen, C. E., "Hydrodynamics of pumps, 1994," Concepts ETI Inc., Oxford Science Publications, p. 81.
  4. Van Esch, B., 2009, "Performance and radial loading of a mixed-flow pump under non-uniform suction flow," Journal of Fluids Engineering, 131(5), p. 051101. https://doi.org/10.1115/1.3089539
  5. Xu, Z., Yi, F., Liu, S., and Wu, Y., "2D PIV Experiments on Non-Uniform Flow in a Rectangular Open Model Pump Suction Passage," Proc. ASME 2005 International Mechanical Engineering Congress and Exposition, American Society of Mechanical Engineers, pp. 523-530.
  6. Huang, W., Zhang, W.-q., Tao, W.-q., He, J.-s., Huang, H., Zhang, F.-y., and Liu, X.-b., 2002, "Flow Characteristics Experimental Study within Connectionbetween Steam Generator Channel Head and Pump Suction," Nuclear Power Engineering, 23(2; SUPP), pp. 38-42.
  7. Yao, Z., Wang, F., Qu, L., Xiao, R., He, C., and Wang, M., 2011, "Experimental investigation of time-frequency characteristics of pressure fluctuations in a double-suction centrifugal pump," Journal of Fluids Engineering, 133(10), p. 101303. https://doi.org/10.1115/1.4004959
  8. Parrondo-Gayo, J. L., Gonzalez-Perez, J., and Fernandez-Francos, J. n., 2002, "The effect of the operating point on the pressure fluctuations at the blade passage frequency in the volute of a centrifugal pump," Journal of Fluids Engineering, 124(3), pp. 784-790. https://doi.org/10.1115/1.1493814
  9. Spence, R., and Amaral-Teixeira, J., 2009, "A CFD parametric study of geometrical variations on the pressure pulsations and performance characteristics of a centrifugal pump," Computers & Fluids, 38(6), pp. 1243-1257. https://doi.org/10.1016/j.compfluid.2008.11.013
  10. Yang, S.-S., Kong, F.-Y., Chen, H., and Su, X.-H., 2012, "Effects of blade wrap angle influencing a pump as turbine," Journal of Fluids Engineering, 134(6), p. 061102. https://doi.org/10.1115/1.4006677
  11. Yang, S.-S., Liu, H.-L., Kong, F.-Y., Xia, B., and Tan, L.-W., 2014, "Effects of the radial gap between impeller tips and volute tongue influencing the performance and pressure pulsations of pump as turbine," Journal of Fluids Engineering, 136(5), p. 054501. https://doi.org/10.1115/1.4026544
  12. Benra, F.-K., 2006, "Numerical and experimental investigation on the flow induced oscillations of a single-blade pump impeller," Journal of Fluids Engineering, 128(4), pp. 783-793. https://doi.org/10.1115/1.2201629
  13. Pei, J., Yuan, S., Benra, F.-K., and Dohmen, H. J., 2012, "Numerical prediction of unsteady pressure field within the whole flow passage of a radial single-blade pump," Journal of Fluids Engineering, 134(10), p. 101103. https://doi.org/10.1115/1.4007382
  14. Pei, J., Yuan, S., and Yuan, J., 2013, "Numerical analysis of periodic flow unsteadiness in a single-blade centrifugal pump," Science China Technological Sciences, 56(1), pp. 212-221. https://doi.org/10.1007/s11431-012-5044-x
  15. Toussaint, M., "Analysis of unsteady flow in centrifugal pump at off-design point operation," Proc. Proceeding of 23rd IAHR Symposium on Hydraulic Machinery and Systems, Yokohama, Japan, Paper.
  16. Zhang, N., Yang, M., Gao, B., Li, Z., and Ni, D., 2015, "Experimental investigation on unsteady pressure pulsation in a centrifugal pump with special slope volute," Journal of Fluids Engineering, 137(6), p. 061103. https://doi.org/10.1115/1.4029574