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首页> 外文会议>ASME Turbo Expo vol.6 pt.A; 20050606-09; Reno-Tahoe,NV(US) >NUMERICAL STUDY OF THE EFFECTS OF BOWED BLADES ON AERODYNAMIC CHARACTERISTICS IN A HIGH PRESSURE TURBINE
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NUMERICAL STUDY OF THE EFFECTS OF BOWED BLADES ON AERODYNAMIC CHARACTERISTICS IN A HIGH PRESSURE TURBINE

机译：叶片对高压汽轮机气动特性影响的数值研究

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摘要

A commercial N-S solver has been employed for simulating the unsteady flow field and analyzing aerodynamic characteristics in a steam turbine stage with low aspect ratio in two cases, one with straight and the other with bowed stator blades. The stator and rotor trailing edge wakes have been studied and compared for two cases. In blade-to-blade view, it was observed that the strength, position and the width or range of influence of wakes in bowed stator blades are bigger than those of straight blades. This effect causes remarkable changes in rotor flow and rotor trailing edge wakes. By analyzing the wake-induced turbulence, it was found that there is a periodic distribution for stator trailing wakes along the radial direction in straight blades, while for bowed blades; the distribution is concentrated towards the midspan. The bowing of stator blades causes the rotor trailing wakes to be greatly strengthened near the hub and casing. The blade loading distribution, viscous dissipation and rotor tip leakage flow for straight and bowed blades are compared in detail to show the aerodynamic performance of stator blade bowing.
机译：在两种情况下（一种是笔直的，另一种是弓形的静叶片），已经使用商用N-S求解器来模拟低纵横比的汽轮机级中的非恒定流场并分析空气动力特性。已经研究并比较了两种情况下的定子和转子后缘尾流。在叶片到叶片的视图中，观察到弓形定子叶片的强度，位置和尾流影响的宽度或影响范围都比直叶片大。这种影响导致转子流量和转子后缘尾流的显着变化。通过分析尾流引起的湍流，发现在直叶片中沿径向方向的定子尾随尾流具有周期性分布，而在弯曲叶片中则存在周期性分布。分布集中在中跨。定子叶片的弯曲使轮毂和机壳附近的转子尾流大大增强。详细比较了直叶片和弓形叶片的叶片载荷分布，粘性耗散和转子尖端泄漏流，以显示定子叶片弯曲的空气动力学性能。

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