Abstract：In order to study the pressure fluctuation characteristics in pump end of axial piston energy recovery integrated machine for seawater desalination at different rotational speeds and outlet pressures, the pressure sensors were installed at the inlet and outlet of the pump end, respectively, and the pressure fluctuation tests were performed at rotational speeds of 800 r/min, 1 000 r/min, 1 200 r/min, 1 450 r/min(rated speed),1 600 r/min and outlet pressures of 4.5 MPa, 5.5 MPa, 6.5 MPa, and 7.5 MPa. In time domain, the experimental results show that the fundamental wave in the pressure fluctuation curves is in a triangular shape, and its amplitude is attenuated with increasing rotational speed, but the amplitude of harmonics gradually increases. Even though the inlet pressure fluctuation curves are in a triangular shape at low rotational speeds, the waveform changes irregularly as the rotational speed increases. In frequency domain, the results show that the shaft rotational frequency is the primary frequency influencing the pressure fluctuation at the pump end outlet at low speeds. With increasing rotational speed, however, the piston multiple frequency becomes more dominant at high rotational speeds, especially harmonics appear at 3Z(Z—number of pistons)multiple frequency of the shaft rotational frequency. As the outlet pressure of the pump rises continuously, the amplitude of the outlet pressure fluctuation at the shaft frequency and the piston frequency increases steadily, but the pressure fluctuation rate(dimensionless amplitude)is constant basically. Further the frequency distribution is more concentrated. The inlet pressure fluctuation rate is decreased at the shaft frequency and rises at the piston multiple frequency.
柳祝勋,张德胜*,蔡佳熙. 柱塞式能量回收一体机泵端多工况压力脉动试验[J]. 排灌机械工程学报, 2020, 38(7): 663-669.
LIU Zhuxun,ZHANG Desheng*,CAI Jiaxi. Test on pressure fluctuation in pump end of axial pistonenergy recovery integrated machine under multiple operational condition. Journal of Drainage and Irrigation Machinery Engin, 2020, 38(7): 663-669.
