Effects of Nozzle Secondary Vortices on Unsteady Hub-Endwall Flow of a Turbine Rotor
Effects of Nozzle Secondary Vortices on Unsteady Hub-Endwall Flow of a Turbine Rotor
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DOI：
10.1299/jpes.2.985
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
T. Matsunuma
中科院分区：
文献类型：
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作者：
T. Matsunuma
利用激光测速系统对轴流式涡轮机转子的非定常流场进行了实验研究。详细测量的时间平均和随时间变化的速度分布，流动角，和湍流强度进行。从绝对（静止）参考系和相对（旋转）参考系的角度分析所获得的数据。本文着重研究了涡轮机导向器轮毂端壁附近的二次涡（通道涡和尾缘涡）对转子通道内流场的影响。由于喷嘴通道涡本身的负射流效应和转子通道涡的形成，喷嘴通道涡在转子吸力面上积聚。喷嘴通道涡在转子内部引起了较大的速度和湍流度波动。
The unsteady flow field of an axial-flow turbine rotor was investigated experimentally using an LDV system. Detailed measurements of the time-averaged and time-dependent distributions of the velocity, the flow angle, and the turbulence intensity were carried out. The obtained data was analyzed from the viewpoints of both absolute (stationary) frame of reference and relative (rotating) frame of reference. This paper focuses on the effect of the turbine nozzle secondary vortices (a passage vortex and a trailing edge vortex) near the hub endwall on the flow field inside the rotor passage. The nozzle passage vortex are accumulated on the rotor suction surface because of both the negative jet effect of the nozzle passage vortex itself and the formation of the rotor passage vortex. The nozzle passage vortex induces large fluctuations of velocity and turbulence intensity inside the rotor.