开槽交错肋通道换热和流阻特性

Heat transfer and flow resistance in a notched crossed-rib channel

对一种特殊结构的涡轮叶片内冷通道——开槽交错肋通道进行了换热和流阻的测量实验.全部的实验都在静止的状态下完成,其中换热实验采用了水蒸气凝结换热方案.实验的Re数范围从5000～45000,得到了大量关于开槽交错肋涡轮叶片内冷通道的实验数据,并将结果与不开槽交错肋通道作出对比,得出一定槽宽的开槽交错肋通道相比于相同尺寸的不开槽交错肋通道,换热效果有了明显的提高,而流阻系数相应有所减小,所以整体换热效果优于不开槽通道.此外,对于不同槽宽通道的各项特性也进行了实验对比.得出4mm开槽交错肋通道的换热效果最好,接下来依次是2mm、6mm和8mm的通道.

The investigation of heat transfer, flow resistance and the pressure across the channel in turbulator cooling channel with a special crossed-rib channel which has slots was studied experimentally, then got amount of experimental results. All experiments were made in stillness states. The method of vapor concreting heat transfer was adopted for the heat transfer experiments. The experiment was conducted in the range of Reynolds number from 5 000 to 45 000. Compared with the channels which are no slots, the same dimensions ones with slots have more significant effects on the whole heat transfer enhancement. Besides, the experimental comparisons of characteristics were made to the different slots width channels. For the channels of different slots width, the heat transfer effects of 4 mm slot width channel are best, the following are 2 mm, 6 mm and 8 mm in turn.