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为了探讨传热对于微型向心涡轮的性能和流动的影响规律,根据微型向心涡轮的特点,针对涡轮的轮毂侧壁面传热现象,建立了涡轮的气动性能随传热量变化的一维模型,并利用数值模拟对模型进行了验证,分析了不同传热量下微型向心涡轮的流动变化。结果表明所发展的模型有较好的精确度,可以用以评估传热对微型向心涡轮性能的影响;较大的传热会改变转子进口相对气流角并影响转子整个通道内的流动;涡轮对外传热使得涡轮输出功降低,涡轮效率明显降低。
In order to investigate the influence of heat transfer on the performance and flow of a miniature radial turbine, according to the characteristics of the miniature radial turbine, a one-dimensional model of the turbine’s aerodynamic performance with the heat transfer was established for the heat transfer on the side wall of the turbine hub. The model was validated by numerical simulation. The flow of micro-centripetal turbine with different heat transfer was analyzed. The results show that the developed model has better accuracy and can be used to evaluate the effect of heat transfer on the performance of micro radial turbine. The larger heat transfer can change the relative air flow angle of the rotor inlet and affect the flow in the whole rotor. External heat transfer makes the turbine output work lower turbine efficiency significantly reduced.