涉及临界工况点的贯流泵装置外特性与压力脉动试验

Experiments on External Characteristics and Pressure Pulsation of Bulb Tubular Pump Device Involving Critical Operating Points

为了揭示贯流泵装置正转全特性分区中各种临界工况点的外特性和压力脉动特性,以某比转数1179的灯泡贯流泵装置为研究对象,对该泵装置进行了涉及临界工况点的外特性及压力脉动试验。试验采集了共64个流量工况点的外特性参数和压力波动,着重分析了灯泡贯流泵装置正转全特性分区中各种临界工况点的外特性和压力脉动特性。试验结果表明,关死点为逆流制动工况与常规泵工况的分界点,泵装置靠近关死点处的扬程为6.41 m,为设计点扬程的3.27倍,轴功率为15.39 kW,为设计点功率的2.67倍。叶轮进口的无量纲压力脉动峰峰值为1.26,叶轮中部为0.99,叶轮出口为0.84,导叶出口为0.23,分别为设计点的2.3、2.8、4.9、23倍。零扬程点为常规泵工况与正流制动工况的分界点,近零扬程点处的流量为设计点流量的1.42倍,轴功率为2.41 kW,为设计点功率的0.42倍。叶轮进口的无量纲压力脉动峰峰值为0.21,叶轮中部为0.21,叶轮出口为0.15,导叶出口为0.01,分别为设计点的0.38、0.6、0.88、1倍。零扭矩点为正流制动工况与水轮机工况的分界点,近零扭矩点处的流量为设计点流量的1.63倍,扬程为-1.36 m,为设计点扬程的-0.69倍。叶轮进口的压力脉动峰峰值为0.37,叶轮中部为0.31,叶轮出口为0.20,导叶出口为0.04,分别为设计点的0.67、0.89、1.18、4倍。

In order to reveal the external characteristics and pressure pulsation characteristics of various critical operating points in the forward full-feature partition of the tubular pump device,taking a bulb tubular pump device with specific speed of 1179 as the research object,the forward full-feature test of the pump device involving the critical operating point was conducted.The external characteristic parameters and pressure fluctuations of a total of 64 flow operating points were collected in the experiment,and the external characteristics and pressure pulsation characteristics of various critical operating points in the forward full characteristic partition of bulb tubular pump device were emphatically analyzed.The test results showed that the turning-off point was the dividing point between the countercurrent braking condition and the pump condition.The head of the pump device near the turning-off point was 6.41 m,which was 3.27 times of the head of the design point.The axial power was 15.39 kW,which was 2.67 times of the design point power.The dimensionless peak value of pressure fluctuation at the inlet of the impeller was 1.26,the middle of the impeller was 0.99,the outlet of the impeller was 0.84,and the outlet of the guide vane was 0.23,which were 2.3,2.8,4.9 and 23 times of the design point,respectively.The zero head point was the boundary point between the pump condition and the positive current braking condition.The flow rate near the zero head point of the pump device was 1.42Qd,which was 1.42 times of the design point flow.The axial power was 2.41 kW,which was 0.42 times of the design point power.The dimensionless pressure fluctuation peak value of the impeller inlet was 0.21,the middle part of the impeller was 0.21,the impeller outlet was 0.15,and the guide vane outlet was 0.01,which were 0.38,0.6,0.88 and 1 times of the design point,respectively.The zero torque point was the boundary point between the positive flow braking condition and the turbine condition.The flow at the near zero torque point of the pump device was 1.63Qd,which was 1.63 times of the flow at the design point,and the head was-1.36 m,which was-0.69 times of the head at the design point.The peak value of pressure fluctuation at the inlet of the impeller was 0.37,the middle of the impeller was 0.31,the outlet of the impeller was 0.20,and the outlet of the guide vane was 0.04,which were 0.67,0.89,1.18 and 4 times of the design point.