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当前位置: 首页 > 文章 > 轴流泵多工况压力脉动特性试验 农业机械学报 2014,45 (11) 139-145
Position: Home > Articles > Experimental Investigation of Pressure Fluctuation with Multiple Flow Rates in Scaled Axial Flow Pump Transactions of the Chinese Society for Agricultural Machinery 2014,45 (11) 139-145

轴流泵多工况压力脉动特性试验

作  者：
张德胜;王海宇;施卫东;潘大志;邵佩佩
单  位：
江苏大学流体机械工程技术研究中心
关键词：
轴流泵;压力脉动;多工况;叶频;谐波;试验
摘  要：
为了掌握不同流量工况下的轴流泵压力脉动特性,在轴流泵叶轮段和导叶段外壁面布置了6个压力脉动监测点,对多个流量工况的压力脉动进行了动态测量,揭示了轴流泵内部不同位置处压力脉动规律。试验结果表明,叶轮进口监测点P1的波形为规则的正弦波形,叶轮内部中间测点P2的压力脉动峰峰值最大,叶轮进口监测点P1压力脉动次之。叶轮进口、叶轮中间和叶轮出口监测点由于受到叶轮内压力梯度的交替变化影响,时域脉动周期与叶片旋转周期一致,在小流量工况下叶轮内部涡流诱导了明显的二次谐波。基于快速傅里叶变换,获得了不同监测点压力脉动频域分布结果,并发现叶轮区域3个压力脉动测点在不同工况的主频均为叶片通过频率(BPF),谐频为叶频的倍数,其幅值呈指数形式衰减。但在导叶进口、导叶中间和导叶出口监测点的压力脉动频域中出现了撞击和回流诱导的低频信号,同时也存在叶轮的主频及其谐频。
译  名：
Experimental Investigation of Pressure Fluctuation with Multiple Flow Rates in Scaled Axial Flow Pump
作  者：
Zhang Desheng;Wang Haiyu;Shi Weidong;Pan Dazhi;Shao Peipei;Research Center of Fluid Machinery Engineering and Technology,Jiangsu University;
关键词：
Axial-flow pump Pressure fluctuation Multi-conditions Blade passing frequency Harmonic Experiment
摘  要：
In order to discuss the characteristics of pressure fluctuation in a scaled axial flow pump at different flow rate conditions,the dynamic pressure fluctuation data of six pressure monitoring points on the pump casing was measured at different flow rates,and the law of pressure fluctuation in impeller was revealed. The experimental results show that waveform of pressure fluctuation at impeller inlet P1 was the normal sine shape,and the peak to peak value of pressure fluctuation at the measuring point P2 in the impeller reached the maximum,and then decreased at monitoring point P1 located in impeller inlet. Time domains of pressure fluctuations in impeller had four peaks and four valleys which were consistent with the impeller blade number,due to the alternating pressure gradient. The secondary flow and tip leakage vortex induced the second harmonic wave significantly at the middle of impeller at small flow rate conditions. Based on Fast Fourier Transform,the main frequencies of pressure fluctuations at three measuring points in the impeller region in different flow rate conditions were all blade passing frequency( BPF),and the harmonic frequency was the multiples of BPF. The amplitudes of harmonic frequency decayed exponentially. However,the low frequency which was induced by the reversed flow and flushing occured in the frequency domain of pressure fluctuations in the guide vane,and the BPF and its harmonics coexisted.

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