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对涡轮旋转盘腔的流动与换热问题,可以采用阻力评价、换热评价和温度分布评价三种评价指标构成工程评价体系。前者决定了全系统的阻力损失的大小,后两者表征了相对冷却效果和热应力水平的高低。应用该评价体系对某型发动机的实际涡轮盘腔冷却结构进行了评价,以实验方法研究了旋转雷诺数、冷气雷诺数、哥拉晓夫数和三种评价指标间的函数关系,为涡轮盘腔的冷却系统优化设计提供了优化目标。
For the problem of flow and heat transfer in the rotating disk chamber of the turbine, three evaluation indexes of resistance evaluation, heat exchange evaluation and temperature distribution can be used to form the engineering evaluation system. The former determines the size of the system-wide resistance loss, the latter two characterize the relative cooling effect and the level of thermal stress. This evaluation system was used to evaluate the actual turbine disk cooling structure of a certain type of engine. The relationship between the rotational Reynolds number, the air-cooled Reynolds number, the Laguerre number and the three evaluation indexes was studied experimentally. Optimization of the cavity cooling system provides the optimization goal.