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首页> 外文会议>Congress of Asia and Pacific Division of International Association of Hydraulic Engineering and Research >NUMERICAL SIMULATION OF CAVITATION FLOW IN TANDEM CASCADE
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NUMERICAL SIMULATION OF CAVITATION FLOW IN TANDEM CASCADE

机译：串联级联空化流量的数值模拟

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Complex cavitation phenomenon in tandem cascade is investigated numerically. Three-dimensional multi-block structural mesh, Finite volume method(FVM), Shear stress transport(SST) turbulence model are employed. Single phase interface tracking model is used as the cavitation model. Flow field without cavitation involved is firstly computed as the initial field for further cavitation flow simulation. Some results are obtained through the simulation:(1) the position where cavitation occurs is near the lowest hydrofoil's upper surface and corresponds to the trailing edge of the middle foil; (2)cavitation zone's profile is greatly influenced by solid boundary and rotary speed, the rear profile of the cavitation zone becomes coarser with shortened distance from the impeller hub; (3)with large rotary speed, the cavitation zone's length vertical to the main flow gets larger and coupling between cavitation zone profile,and flow parameters proves to be more salient.
机译：在数值上研究了串联级联中的复杂空化现象。采用三维多块结构网，有限体积法（FVM），剪切应力传输（SST）湍流模型。单相接口跟踪模型用作空化模型。没有涉及的流场首先被计算为进一步空化流动模拟的初始领域。通过模拟获得的一些结果：（1）出现空化的位置靠近最低水膜的上表面，并且对应于中间箔的后缘; （2）空化区的轮廓受到固体边界和旋转速度的大大影响，空化区的后轮廓变得粗糙，距离叶轮毂缩短距离; （3）具有大的旋转速度，空化区的长度垂直于主流越大且空化区曲线之间的耦合，并且流量参数被证明是更突出的。

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