Effects of Twisted and Cylindrical Blades on the Flow Characteristics inside Blade Inlet and Outlet for a Centrifugal Pump

Abstract:

In this paper, the performance between cylindrical and twisted blades are analyzed for the same centrifugal pump. The three-dimensional steady and unsteady flow fields under 0.7Q_d, Q_d and 1.3Q_d are simulated. The blade inlet and outlet flow and pressure pulsation inside the centrifugal pumps are discussed by using mathematical statistics and frequency domain analysis methods. The research is verified by experiments. The results show that the twisted blade controls blade outlet better than cylindrical blade at small flow and design flow, cylindrical blade controls blade outlet better than twisted blade at large flow. In the blade inlet and outlet, as the flow changes, the instability of cylindrical blade loading is higher than that of twisted blade. The cylindrical blade inlet pressure is affected by the shaft frequency more than that of the twisted blade. At shaft frequency and blade frequency, pressure pulsation coefficient of cylindrical blade outlet is higher than that of twisted blade outlet. The cylindrical and twisted blades effect on the blade inlet and middle gradually accumulates, resulting twisted blade outlet has larger pressure pulsation. The result can guide the optimum design of centrifugal pump to consider the performance balance between twisted and cylindrical blades.

• Periodical: Applied Mechanics and Materials (Volumes 494-495)
• Pages: 645-650
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.494-495.645
• Online since: February 2014
• Authors: Xin Deng*, Shou Qi Yuan, Qiao Rui Si, Jian Ping Yuan, Jin Feng Zhang
• Keywords: Blade Inlet, Blade Outlet, Centrifugal Pump, Cylindrical Blades, Flow Characteristic, Twisted Blade

References

[1] Shao Chunlei, Gu Boqin, Chen Ye. Numerical simulation of unsteady pressure field in centrifugal pumps, Transactions of the Chinese Society of Agricultural Engineering, 2009, 25(1): 75-80.

[2] Zhu Rongsheng, Su Baowen, Yang Ailing, et al. Numerical investigation of unsteady pressure fluctuations in centrifugal pump, Transactions of the Chinese Society for Agricultural Machinery, 2010, 41(11): 43-47.

[3] González J, Fernandez J, Blanco E, et al. Numerical simulation of the dynamic effects due to impeller-volute interaction in a centrifugal pump, Transactions-American Society of Mechanical Engineers Journal of Fluids Engineering, 2002, 124(2): 348-355.

DOI: 10.1115/1.1457452

[4] Kitano Majidi. Numerical study of unsteady flow in a centrifugal pump, Journal of Turbomachinery, Transactions of the ASME, 2005, 127(2): 363-371.

DOI: 10.1115/1.1776587

[5] Cheah K W, Lee T S, Winoto S H, et al. Numerical flow simulation in a centrifugal pump at design and off design conditions, International Journal of Rotating Machinery, 2007, 1-8.

DOI: 10.1155/2007/83641

[6] Guleren K M, Pinarbasi A. Numerical simulation of the stalled flow within a vaned centrifugal pump, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2004, 218(4): 425-436.

DOI: 10.1177/095440620421800407