In this work, a micro-channel-based wall cooling approach is investigated. The cooling efficiency of curved surfaces is determined by employing a computational study for conjugate heat transfer. A semi-circular curved body depicting the turbine blade leading edge, with a microchannel placed in the solid wall of the body and three rows of film holes, is considered for the study. The film holes are positioned along a stagnation line and either side of the stagnation line at an angle of 25^o. The steady-state solver with a realizable k-ε turbulence model is used to study the heat transfer results for film cooling in a 3D geometry. Simulations were carried out, and subsequently, parametric analysis was performed to observe the effect of varying blowing ratio and temperature ratio. The temperature distribution is observed to be more uniform due to the presence of the microchannel, resulting in a lesser thermal gradient on the curved surface. It is also noted that overall effectiveness increases with the blowing ratio. The maximum increase in overall effectiveness due to placing the microchannel is found to be ~16% for the blowing ratio of three.

在这项工作中，研究了一种基于微通道的壁冷却方法。曲面的冷却效率是通过对共轭传热进行计算研究来确定的。该研究考虑了描绘涡轮叶片前缘的半圆形弯曲主体，在主体的实体壁中放置了一个微通道和三排薄膜孔。膜孔在25的角度沿停滞线和滞流线的任一侧定位^ö. 具有可实现的 k-ε 湍流模型的稳态求解器用于研究 3D 几何中薄膜冷却的传热结果。进行了模拟，随后进行了参数分析以观察不同吹塑比和温度比的影响。由于微通道的存在，观察到温度分布更均匀，导致弯曲表面上的热梯度更小。还注意到整体效率随着吹塑比的增加而增加。发现由于放置微通道，整体效率的最大增加对于吹塑比为 3 时约为 16%。