Natural Transition Phenomena on an Axial Compressor Blade
Natural Transition Phenomena on an Axial Compressor Blade
复制标题
轴流压缩机叶片上的自然过渡现象
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
G. Walker
中科院分区：
文献类型：
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作者：
J. Hughes;G. Walker
为了寻找自然跃迁现象的直接证据，分析了1.5级轴流压气机出口定子表面热膜阵列的数据，提出了一种识别Tollmien-Schlichting(T-S)频率范围内不稳定波的算法。该算法与湍流间歇性检测例程相结合，以生成显示在湍流区域之前出现不稳定波的概率的时空图。本文比较了在一定的叶片载荷范围内，与进气导叶计时产生的最大和最小进流扰动周期对应的自由流条件下的曲线图。在几乎所有的情况下都发现了放大不稳定波的大范围区域。讨论了轴流叶轮机械叶片减速流区过渡预测的意义。
Data from a surface hot-film array on the outlet stator of a 1.5-stage axial compressor are analyzed to look for direct evidence of natural transition phenomena, An algorithm is developed to identify instability waves within the Tollmien-Schlichting (T-S) frequency range. The algorithm is combined with a turbulent intermittency detection routine to produce space-time diagrams showing the probability of instability wave occurrence prior to regions of turbulent flow. The paper compares these plots for a range of blade loading, with free-stream conditions corresponding to the maximum and minimum inflow disturbance periodicity produced by inlet guide vane clocking. Extensive regions of amplifying instability waves are identified in nearly all cases. The implications for transition prediction in decelerating flow regions on axial turbomachine blades are discussed.