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Local Heat Transfer Measurement in an Internal Cooling Passage of a Gas Turbine Blade and its Direct Numerical Simulation

燃气轮机叶片内冷通道局部传热测量及其直接数值模拟

基本信息

批准号：
07455091
负责人：
MOCHIZUKI Sadanari
金额：
$ 4.1万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

In order to clarify the structure of turbulent flow governing the heat transfer in a rotating system, the experiments of smooth and rib-roughened ducts and the numerical analysis were performed. In the experiments, two different experimental setups were used. One is for straight-duct experiment and the other is for serpentine-duct experiment. The square-straight-duct results measured by using 204 thermocouples showed the variation of heat transfer coefficient in both streamwise and peripheral directions. The case of 90 degrees rib arrangement showed the locally maximum heat transfer between the two consecutive ribs. When the ribs were inclined to 60 degrees, the secondary flow induced by this inclination caused the augmentation in heat transfer. In the rectangular serpentine duct case, the rib inclination effect was examined changing the inclination angle from 45 to 90 degrees by using 458 thermocouples. The maximum heat transfer was obtained around the angle of 45-60 degrees.In the numerical analysis, the rotating square smooth duct case was simulated by using the finite difference method. The Reynolds number defined by using the half side length and the friction velocity was 350 and the rotation number was varied from 0 to 1.0. Because of the computational resource limitation, the Smagorinsky model was introduced. The numerical results showed the effect of the Coriolis force on the peripheral variation of heat transfer and the laminarization near the suction side. When the extension to the more complicated duct configuration is considered, the introduction of the parallel computing technique and the universal sub-grid scale model will be essential as a next step.

为了弄清旋转系统中紊流控制换热的结构，进行了光滑管道和粗肋管道的实验和数值分析。在实验中，使用了两种不同的实验设置。一种用于直管实验，另一种用于蛇形管实验。用204对热电偶对方形直管进行了测量，结果显示了沿流方向和沿周方向传热系数的变化。在90度肋排的情况下，显示了两个连续肋之间的局部最大传热。当肋部倾斜60度时，肋部倾斜引起的二次流增加了换热。在矩形蛇形管道的情况下，利用458个热电偶，研究了倾斜角度从45°到90°变化时的肋倾斜效应。在45-60度角处换热效果最佳。在数值分析中，采用有限差分法对旋转方形光滑风管进行了数值模拟。用半边长和摩擦速度定义的雷诺数为350，旋转数在0 ~ 1.0之间变化。由于计算资源的限制，引入了Smagorinsky模型。数值计算结果表明，科里奥利力对吸力侧周边换热变化和层压化的影响。当考虑扩展到更复杂的管道结构时，引入并行计算技术和通用子网格比例模型将是必不可少的下一步。