| 柱塞式能量回收一体机泵端多工况压力脉动试验 |
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| 引用本文： | 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. |
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| 作者姓名： | 柳祝勋 张德胜 蔡佳熙 |
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| 作者单位： | 江苏大学国家水泵及系统工程技术研究中心,江苏 镇江212013;江苏大学国家水泵及系统工程技术研究中心,江苏 镇江212013;江苏大学国家水泵及系统工程技术研究中心,江苏 镇江212013 |
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| 摘 要： | 为研究不同具体工况对海水淡化柱塞式能量回收一体机压力脉动特性的影响,分别在泵端的进出口布置压力脉动监测点,控制变量使压力脉动试验分别在(控制出口压力恒定)转速为800~1 600 r/min和(控制转速额定)出口压力为4.5~7.5 MPa等9种工况下进行.通过分析试验结果的时域规律可得:在一体机泵端出口处,压力脉动率曲线的基波表现为三角波形态;随着一体机转速的递增,出口的压力脉动率曲线的谐波振幅递增,基波振幅则递减;进口处压力脉动曲线波形随转速递增产生不规律变化.通过对试验结果中频域的分析可得:轴频在较低转速时是出口压力脉动的主要影响频率,柱塞倍频在较高转速成为主要影响频率,并在轴频的3Z倍(Z为柱塞数)出现谐波;随着出口压力的递增,出口压力脉动幅值在轴频和柱塞倍频处均为递增,压力脉动率维持不变,且频率分布则变得更加集中;同时吸入口的压力脉动率幅值随着出口压力的递增在柱塞倍频处递增,而在轴频处递减.
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| 关 键 词： | 压力脉动 柱塞式 频域 峰峰值 谐波 |
| 收稿时间： | 2019-04-15 |
Test on pressure fluctuation in pump end of axial pistonenergy recovery integrated machine under multiple operational condition |
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| LIU Zhuxun,ZHANG Desheng,CAI Jiaxi.Test on pressure fluctuation in pump end of axial pistonenergy recovery integrated machine under multiple operational condition[J].Journal of Drainage and Irrigation Machinery Engineering,2020,38(7):663-669. |
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| Authors: | LIU Zhuxun ZHANG Desheng CAI Jiaxi |
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| Institution: | National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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| 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. |
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| Keywords: | pressure fluctuation axial piston frequency domain peak-to-peak value harmonic |
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