An experimental investigation is pr

进行了有关以双螺旋蜗壳运行的高比速离心泵叶轮（vS 5 1.7）内非定常压力场的实验研究。为此，将二十五个压阻式压力传感器安装在单个叶片通道内，并使用遥测系统在旋转的叶轮框架中进行采样。根据压力波动幅度和相位差评估了变化的通量对压力传感器的影响。数量级信息显示，随着叶轮-蜗壳相互作用的压力波动随着体积流量从最佳效率点被进一步去除以及接近叶轮叶片的后缘而增大。在深部部分负载下，这些波动达到了泵压头的35％。蜗壳稳态压力场的上游影响在所有非设计载荷点主导了叶轮内的非稳态压力场。所获取的信号相位信息可以识别出叶轮通道内的压力场不稳定，因为该压力场与蜗壳舌片通过频率基本同时同步。当叶轮进，出口再循环开始和停止时，应特别强调在泵和叶轮的压力排放特性经历滞后的体积通量范围。进行旋转换能器的综合以获得不稳定的叶片加载参数。对于部分负载操作中的单个叶片（在45％bep时），非稳定升力系数的值在200％左右变化，当前行驶叶片吸力侧经过蜗壳舌时会发生突然的波动。还显示了在叶轮-蜗壳舌相互作用期间，非定常力矩系数和压力中心有很大变化。

对在双螺旋卷中运行的高速离心泵叶轮（vS 5 1.7）内的不稳定压力场进行了实验研究。为此，25个压力传感器安装在一个叶片通道中，并用遥测系统在旋转叶轮框架中采样。根据压力波动幅度和相位差对压力传感器的影响进行了评价。震级表示，随着体积通量从最佳效率点进一步去除，以及叶轮叶片的后缘接近，叶轮-卷伏相互作用的压力波动增加。这些波动在深部分负载中达到泵头的 35%。挥发稳定压力场的上游影响在设计负载点的所有关闭时都控制着叶轮内部的不稳定压力场。获得的信号相位信息允许识别叶轮通道内的压力场不稳定性，与伏舌通频同步。特别强调了泵和叶轮压力放电特性经历歇斯底里的体积通量机制，因为叶轮进气口和出口再循环开始和停止。对旋转传感器进行了合成，以获得不稳定的刀片加载参数。在零件负载操作中，单个铲刀的不稳定性提升系数值在 200% 的范围内变化（在 45% bep 时），当前运行刀片吸气侧经过一个伏舌时，会突然波动。在叶轮-挥发性舌头间穿时时，不稳的时位系数和压力中心也显示出显著变化。

An experimental investigation is presented regarding the unsteady pressure field within a high specific speed centrifugal pump impeller ( vS 5 1.7) which operated in a double spiral volute. For this, twenty-five piezoresistive pressure transducers were mounted within a single blade passage and sampled in the rotating impeller frame with a telemetry system. The influence of varying volume flux on the pressure transducers was evaluated in terms of pressure fluctuation magnitudes and phase differences. The magnitude infor- mation reveals that the pressure fluctuations from the impeller-volute interaction grew as the volume flux became further removed from the best efficiency point and as the trailing edge of the impeller blade was approached. These fluctuations reached 35% of the pump head in deep part load. The upstream influence of the volute steady pressure field dominates the unsteady pressure field within the impeller at all off design load points. Acquired signal phase information permits the identification of the pressure field un- steadiness within the impeller passage as fundamentally synchronized simultaneously with the volute tongue passing frequency. Special emphasis was placed on the volume flux regime where the pump and impeller pressure discharge characteristic undergo hyster- esis, as impeller inlet and outlet recirculation commence and cease. A synthesis of the rotating transducers was performed to obtain unsteady blade loading parameters. The value of the unsteady lift coefficient varies on the order of 200% for a single blade in part load operation (at 45% bep), an abrupt fluctuation occurring as the fore running blade suction side passes a volute tongue. The unsteady moment coefficient and center of pressure are also shown to vary significantly during the impeller-volute tongue interac- tion.<br>