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首页> 外文期刊>Journal of Fluids Engineering: Transactions of the ASME >Experimental Investigations of Cavitation Performance Breakdown in an Axial Waterjet Pump
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Experimental Investigations of Cavitation Performance Breakdown in an Axial Waterjet Pump

机译：轴向水射流泵空化性能分解的实验研究

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This experimental study examines the mechanisms causing cavitation breakdown in an axial waterjet pump. The database includes performance curves, images of cavitation, measured changes to endwall pressure as the blade passes, as well as velocity and pressure distributions inside the blade passage, the latter estimated using Bernoulli's Equation in the rotor reference frame. They show that cavitation breakdown is associated with a rapid expansion of the attached cavitation on the blade suction side (SS) into the blade overlap region, blocking part of the entrance to this passage, increasing the velocity and reducing the pressure along the pressure side (PS) of the blade. Initially, expansion of the SS cavitation compensates for the reduced PS pressure, resulting in a slight increase in performance. Further reduction of the inlet pressure causes a rapid decrease in performance as the SS pressure remains at the vapor pressure, while the PS pressure keeps on decreasing. In addition, during the breakdown, entrainment of the cloud cavitation by the tip leakage vortex generates the previously observed perpendicular cavitating vortices (PCVs) that extend across the passage and reduce the through-flow area in the tip region. Tests have been repeated after installing circumferential casing grooves aimed at manipulating the tip leakage flow and reduce the formation of PCVs. These grooves indeed reduce the tip region blockage during early phases. However, they have a small effect on the performance degradation by cavitation breakdown, presumably owing to their limited effect on the attached SS cavitation and tip region cloud cavitation.
机译：该实验研究探讨了导致轴向水箱泵中的空化击穿的机制。数据库包括性能曲线，空化图像，作为叶片通过的速度和压力分布在叶片通道内的速度和压力分布，所以在转子参考框架中使用Bernoulli的等式估计的速度和压力分布。它们表明，空化击穿与叶片吸入侧（SS）上的附着空气的快速膨胀相关联，进入叶片重叠区域，阻挡该通道的一部分，增加速度并减小压力侧的压力（刀片的ps）。最初，SS空化的扩展补偿了降低的PS压力，导致性能略有增加。进一步减小入口压力导致性能的快速降低，因为SS压力保持在蒸汽压力，而PS压力保持降低。另外，在击穿期间，通过尖端泄漏涡流的夹带覆盖物产生先前观察到的垂直空腔涡流（PCV），其横跨通道延伸并减少尖端区域中的通孔区域。在安装圆周壳体槽之后已经重复了测试，该套管凹槽旨在操纵尖端泄漏流动并减少PCV的形成。这些凹槽确实在早期阶段期间减小了尖端区域堵塞。然而，它们对空化击穿的性能降低具有很小的影响，可能由于它们对附着的SS空化和尖端区域云空化的有限影响而受到限制。

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