The research presents a new analytical grid generation methodology for computational fluid dynamics studies in positive displacement sliding vane rotary machines based on the user defined nodal displacement approach. This method is more inclusive than state of the art ones since it enables the investigation of a broader range of design configurations, such as single, double and multiple-acting vane machines with non-circular housing, slanted blade and asymmetric blade tip profiles. Node number and radial divisions of blade tip are the parameters that affect most the mesh quality. The method was validated against indicated pressure measurements on a rotary vane expander resulting in a confidence interval within 4.31%. The benchmark analysis showed that the proposed method is as accurate as the manual ANSYS ICEM one but more than 1500 times faster (111s instead of 48h to generate 360 grids). The paper further proposes a novel method to track the leakage flows at the blade tip gaps of vane machines through a post-processing routine in ANSYS CFD-Post based on rotating monitoring planes. The leakage assessment on the vane expander case study showed that a 10 μm gap between blade tip and the 76 mm stator led to a 0.06 unit increase of the expander filling factor.

该研究提出了一种新的分析网格生成方法，用于基于用户定义的节点位移方法的容积式滑片旋转机械中的计算流体动力学研究。这种方法比最先进的方法更具包容性，因为它可以研究更广泛的设计配置，例如具有非圆形外壳、倾斜叶片和不对称叶尖轮廓的单作用、双作用和多作用叶片机器。叶尖的节点数和径向分割是影响网格质量最大的参数。该方法根据旋转叶片膨胀机上的指示压力测量值进行了验证，置信区间在 4.31% 以内。基准分析表明，所提出的方法与手动 ANSYS ICEM 一样准确，但要快 1500 倍以上（生成 360 个网格需要 111 秒而不是 48 小时）。本文进一步提出了一种新方法，通过基于旋转监测平面的 ANSYS CFD-Post 后处理程序来跟踪叶片机叶尖间隙处的泄漏流。叶片膨胀机案例研究的泄漏评估表明，叶片尖端和 76 mm 定子之间的 10 μm 间隙导致膨胀机填充因子增加 0.06 个单位。