转速对离心泵反转用作透平空化特性的影响

透平运行中产生的空化会影响其能量的转化,因此,使用离心泵反转用作透平,利用数值模拟的方法,对透平分别在5种不同转速下的、不同空化余量的内部流动规律进行了数值模拟,得出了不同转速下透平空化的特性曲线和内部流场特性.通过分析不同转速下的空化规律,得到了透平能量转化的最佳性能临界点,并且建立了转速与透平产生空化的临界空化余量...

Influence of Rotational Speed on Cavitation Characteristics of Centrifugal Pump as Turbines

In view of the fact that the cavitation generated in the operation of the turbine affects its energy conversion, with the centrifugal pump reverse used as a turbine, the numerical simulation method is used to simulate the internal flow law of the turbine under five different speeds and different cavitation allowance, thus obtaining the cavitation characteristic curves and internal flow field characteristics of the turbine under different speeds. Based on the analysis of the cavitation law at different rotational speeds, the optimal performance threshold of the turbine energy conversion is obtained, followed by the establishment of the critical cavitation coefficient relationship between rotational speed and turbine cavitation. The results show that the rotational speed is positively correlated with the critical cavitation coefficient of the turbine; the turbine works above the critical cavitation coefficient; the cavitation bubbles gather at the tail pipe with the turbine severely cavitated, which is not conducive to the outflow of fluid and results in a reduction of the energy conversion.