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首页> 外文期刊>Applied Sciences >Compressible Two-Phase Viscous Flow Investigations of Cavitation Dynamics for the ITTC Standard Cavitator
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Compressible Two-Phase Viscous Flow Investigations of Cavitation Dynamics for the ITTC Standard Cavitator

机译：ITTC标准空穴空化动力学的可压缩两相粘性流量研究

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摘要

In this paper, the ITTC Standard Cavitator is numerically investigated in a cavitation tunnel. Simulations at different cavitation numbers are compared against experiments conducted in the cavitation tunnel of SVA Potsdam. The focus is placed on the numerical prediction of sheet-cavitation dynamics and the analysis of transient phenomena. A compressible two-phase flow model is used for the flow solution, and two turbulence closures are employed: a two-equation unsteady RANS model, and a hybrid RANS/LES model. A homogeneous mixture model is used for the two phases. Detailed analysis of the cavitation shedding mechanism confirms that the dynamics of the sheet cavitation are dictated by the re-entrant jet. The break-off cycle is relatively periodic in both investigated cases with approximately constant shedding frequency. The CFD predicted sheet-cavitation shedding frequencies can be observed also in the acoustic measurements. The Strouhal numbers lie within the usual ranges reported in the literature for sheet-cavitation shedding. We furthermore demonstrate that the vortical flow structures can in certain cases develop striking cavitating toroidal vortices, as well as pressure wave fronts associated with a cavity cloud collapse event. To our knowledge, our numerical analyses are the first reported for the ITTC standard cavitator.
机译：在本文中，ITTC标准空穴在空化隧道中进行了数量地研究。将不同空化数的模拟与在SVA波茨坦的空化隧道中进行的实验进行比较。将重点放在片状动力学的数值预测上，以及瞬态现象的分析。可压缩的两相流量模型用于流动解决方案，采用两个湍流闭合：两个等式不稳定的RAN模型和混合RAN / LES模型。均匀混合模型用于两相。对空化脱落机构的详细分析证实了纸张空化的动态由再参赛者射流决定。断开循环在具有近似恒定的脱落频率的研究中相对周期性。可以在声学测量中观察到CFD预测的片状脱落频率。 Strouhal数字位于文献中报告的片状脱落的常规范围内。我们还证明，在某些情况下，涡流结构可以在某些情况下开发出醒目的空化环形涡流，以及与腔云塌陷事件相关的压力波前线。据我们所知，我们的数值分析是ITTC标准空腔的第一个报告。

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