Cross Flow Effects on Endwall Heat Transfer in Film-Cooled Turbine Nozzle Guide Vanes
Cross Flow Effects on Endwall Heat Transfer in Film-Cooled Turbine Nozzle Guide Vanes
复制标题
膜冷涡轮喷嘴导叶端壁传热的横流效应
DOI：
10.1115/gt2013-94898
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Takeishi
中科院分区：
文献类型：
--
作者：
Reviol;Franze;Böhle;Wiedermann;Takeishi
由于二次流对传热的影响很大，因此驻点区域端壁上的气膜冷却效应是特别重要的。此外，沿滞止流线存在复杂的涡结构，影响端壁上的换热。这种流动现象在公开的文献中有描述和讨论，但仍然难以用CFD方法足够精确地预测端壁和涡轮型面上的传热。本文探讨了如何用CFD模拟滞止区流场。研究了不同网格分辨率的网格和k-ε-、k-ω- sst和des湍流模型的影响。将cfd数据与萘升华法、压敏涂料法、激光诱导荧光法和粒子图像测速法得到的实验结果进行了比较。对平板上的气膜冷却、对称翼型附近的端壁流动和对称翼型端壁气膜冷却三种情况进行了详细的研究。
< jats: p> Film cooling effects on endwalls in the stagnation point region are of special interest since the heat transfer is influenced drastically by secondary flows. Additionally, a complex vortex structure exists along the stagnation streamline which influences heat transfer on the endwall. The flow phenomenon is described and discussed in the open literature but it is still difficult to predict the heat transfer on the endwall and the turbine profile by CFD methods with sufficient accuracy.< jats: p> In this paper it is examined how the flow field in the stagnation region should be simulated using CFD. The effect of meshes with various grid resolutions and turbulence models as k-ε-, k-ω-SST-and DES-turbulence models have been investigated. The CFD-data are compared with the experimental results obtained by Naphthalene Sublimation Method, Pressure Sensitive Paint, Laser Induced Fluorescence and Particle Image Velocimetry. Three cases, namely film cooling on a flat plate, the endwall flow near a symmetrical airfoil and the symmetrical airfoil with endwall film cooling, are examined in detail.