Abstract The effect of conjugate heat transfer is investigated on a first stage nozzle guide vane (NGV) of a high pressure gas turbine which has both impingement and film cooling holes. The study is carried out computationally by considering a linear cascade domain, having two passages formed between the vanes, with a chord length of 228 mm and spacing of 200 mm. The effect of (i) coolant and mainstream Reynolds numbers, (ii) thermal conductivity (iii) temperature difference between the mainstream and coolant at the internal surface of the nozzle guide vane are investigated under conjugate thermal condition. The results show that, with increasing coolant Reynolds number the lower conducting material shows larger percentage decrease in surface temperature as compared to the higher conducting material. However, the internal surface temperature is nearly independent of mainstream Reynolds number variation but shows significant variation for higher conducting material. Further, the temperature gradient within the solid thickness of NGV is higher for the lower conductivity material.

中文翻译：

---

冲击与薄膜冷却相结合的喷嘴导叶内表面共轭传热分析

摘要 研究了共轭传热对具有冲击和薄膜冷却孔的高压燃气轮机第一级喷嘴导叶（NGV）的影响。该研究是通过考虑线性级联域以计算方式进行的，在叶片之间形成两个通道，弦长为 228 毫米，间距为 200 毫米。在共轭热条件下研究了（i）冷却剂和主流雷诺数，（ii）热导率（iii）喷嘴导叶内表面处主流和冷却剂之间的温差的影响。结果表明，随着冷却剂雷诺数的增加，与较高导电材料相比，较低导电材料显示出更大的表面温度下降百分比。然而，内表面温度几乎与主流雷诺数变化无关，但对于较高导电材料显示出显着变化。此外，对于导电率较低的材料，NGV 固体厚度内的温度梯度更高。