向心透平内部流动的研究

Numerical Investigation of the Fluid Flow Inside Radial Inflow Turbine

对向心透平内部的流动进行了实验与数值的研究。蜗壳内采用单斜丝热线在同一位置旋转,在三个不同的方位测量后拟合计算得到气流的三维速度。在某些特征位置与数值结果的对比,说明了数值结果的可靠性与局限性。对导叶内的流动模拟,确定了入口角度对导叶内二次流动的影响。对叶轮内流动模拟,说明了叶顶泄漏流对主流的作用,以及叶轮内部壁角涡的形成与发展。这些工作对向心透平内部流动的认识提供了参考。

This paper presents one experimental and numerical investigation of the internal flow inside one radial inflow turbine, including scroll, vane and impeller. Three dimensional flow velocity component is measured by slanted single thermal film anemometer rotating at three different incidence positions. Measuring data is calibrated and compared with numerical results which are validated for robustness and limitations. Flow inside vane is simulated to show the influence of incidence on cross channel flow pattern. Simulated flow inside impeller illustrates the tip clearance and corner vortex developing and mixing with main flow through passage. These work will be instructive in flow analysis and designing radial inflow turbine.