考虑冷气喷射的涡轮叶栅尾缘损失理论分析

 基于Denton 的尾缘流动理论, 发展了一种考虑冷气喷射的二维、可压涡轮叶栅尾缘混合损失模型,研究了涡轮叶栅尾缘损失的特征, 定量评估了影响尾缘损失的各种参数。研究表明, 冷气流量是影响尾缘损失的一个重要参数, 对于主流马赫数为11 1 的典型情况, 冷气流量从0 增大到10%, 损失增大315 倍。叶片尾缘基压变化对损失也具有明显的影响, 其它影响损失的参数包括叶栅出口位置边界层动量厚度、冷气总压、叶栅尾缘厚度等。

Theoretical Analysis and Prediction Method for the Trailing Edge Loss of Turbine Cascade with Coolant Injection

A two-dimensional, compressible flow model for loss created by the mixing behind the turbine cascade with coolant injection is presented, based on the theory developed by Denton. The principal mechanism and characteristics of loss caused by the flow mixing due to wake, coolant and base flow (base pressure) have been established in this paper. Calculations show that the coolant flow mass, base pressure and boundary layer momentum thickness have a great effect on the trailing edge loss. This paper presents the quantitative resumts to assess the effects of above parameters on the trailing edge loss.