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本文以Aachen 1.5级轴流涡轮为研究对象,采用Fine/Turbo软件包分别模拟了模拟了三种不同流量工况下,平均叶顶间隙高度比(平均叶顶间隙高度与叶片高度的比值)分别为0.7%、1.3%、1.9%时其转子存在静偏心时的三维定常流场。在验证与确认的基础上,分析了转子偏心对激振力和涡轮的气动性能的影响。转子的激振力随偏心距的增大而线性增加,且间隙尺度越大,增加越快。在偏心较为严重时,适当增大间隙尺度,有利于削弱涡动的堵塞效应,降低泄漏损失。
In this paper, the Aachen 1.5-stage axial-flow turbine is taken as the research object. Using the Fine / Turbo software package, the average ratio of the tip clearance height (the ratio of the average tip clearance height to the blade height) is simulated under three different flow conditions Is 0.7%, 1.3%, 1.9% when the rotor static eccentricity of three-dimensional steady flow field. Based on the verification and confirmation, the influence of rotor eccentricity on the exciting force and the aerodynamic performance of the turbine is analyzed. The exciting force of the rotor increases linearly with the increase of the eccentricity, and the larger the gap size, the faster the increase. When the eccentricity is more serious, properly increasing the gap size will reduce the clogging effect of the vortex and reduce the leakage loss.