变几何径向透平损失模型及其分析

基于99 mm叶轮实验,分析了变几何径向透平静叶的各种损失以及不同的损失模型.给出了变几何透平静叶冲角损失的定量分析.通过计算对比不同静叶喉部宽度下叶道边界层摩擦损失,验证了Glassman模型在计算叶片流道损失时,与试验结果是相符的.基于NASA损失模型分析了径向透平静叶的尾缘损失,损失随着出口边厚度呈线性增加,减小出口边厚度是减小尾缘损失的有效方法.

Loss models and loss analysis of variable geometry radial inflow turbine

Based on the experimental data of a 99 mm rotor,various losses and loss models of the stator of variable geometry radial inflow turbine(VGT) was analyzed.Also,a quantitative analysis was performed for the incidence loss in VGT's stator.When calculating the blade passage loss,Glassman loss model was proved to match the test results by calculating comparatively the boundary layer friction loss in blade row with different stator throat widths.The trailing-edge loss of radial inflow turbine stator was discussed based on the loss models of NASA,showing that the loss increases linearly with the trailing edge thickness.Thus,an efficient method of reducing trailing-edge loss is to cut down the trailing edge thickness.