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针对某微型燃气轮机的微型离心叶轮,采用三维数值模拟方法,将绝热壁面情况和考虑传热影响情况下的叶轮性能和内部流场进行对比研究,重点分析壁面传热情况对微型离心叶轮间隙泄漏流动的影响.研究发现:传热对叶轮性能的影响主要集中在其对间隙泄漏流的作用上.绝热条件下间隙泄漏流轨迹沿叶片吸力面向下游发展,传热则使得间隙泄漏流动迹向相邻叶片压力面偏转,增强间隙泄漏流与主流的掺混导致间隙泄漏流损失增大.与绝热情况相比,传热虽然在一定程度上减弱了叶片通道内的压力梯度,但由于热量的传入会导致间隙泄漏流初始堵塞增大,最终仍会在叶片通道内造成更大的间隙泄漏流堵塞.
Aiming at the micro centrifugal impeller of a micro gas turbine, a three-dimensional numerical simulation method is used to compare the condition of the adiabatic wall and the impeller performance and the internal flow field under the influence of heat transfer. The analysis of wall heat transfer on the micro-centrifugal impeller clearance leakage flow The results show that the heat transfer affects the performance of the impeller mainly in the role of the leakage flow of the gap.According to the suction force of the blade, the trajectory of the leakage flow develops adiabatically and the heat transfer makes the leakage flow of the gap adjacent Compared with the adiabatic case, the heat transfer, while weakening the pressure gradient in the vane passage to a certain degree, is more likely to occur due to the heat input Leading to an increase in initial blockage of the leakage flow in the gap, eventually resulting in a larger gap leakage flow blockage in the blade passage.