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首页> 外文会议>AIAA aerospace sciences meeting including the new horizons forum and aerospace exposition >Computational Study of the Impact of Unsteadiness on the Aerodynamic Performance of a Variable-Speed Power Turbine
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Computational Study of the Impact of Unsteadiness on the Aerodynamic Performance of a Variable-Speed Power Turbine

机译：不稳定对变速动力涡轮机气动性能影响的计算研究

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The design-point and off-design performance of an embedded 1.5-stage portion of a variable-speed power turbine (VSPT) was assessed using Reynolds-Averaged Navier-Stokes (RANS) analyses with mixing-planes and sector-periodic, unsteady RANS analyses. The VSPT provides one means by which to effect the nearly 50% main-rotor speed change required for the NASA Large Civil Tilt-Rotor (LCTR) application. The change in VSPT shaft-speed during the LCTR mission results in blade-row incidence angle changes of as high as 55°. Negative incidence levels of this magnitude at takeoff operation give rise to a vortical flow structure in the pressure-side cove of a high-turn rotor that transports low-momentum flow toward the casing endwall. The intent of the effort was to assess the impact of unsteadiness of blade-row interaction on the time-mean flow and, specifically, to identify potential departure from the predicted trend of efficiency with shaft-speed change of meanline and 3-D RANS/mixing-plane analyses used for design.
机译：使用带有混合平面和扇形周期非稳态RANS的雷诺平均Navier-Stokes（RANS）分析评估了变速动力涡轮（VSPT）的嵌入式1.5级部分的设计点和非设计性能分析。 VSPT提供了一种方法，可以实现NASA大型民用倾斜转子（LCTR）应用所需的近50％的主转子速度变化。 LCTR任务期间VSPT轴速度的变化导致叶片行入射角变化高达55°。在起飞操作时，这种大小的负入射水平会在高转速转子的压力侧凹腔中形成涡流结构，该涡流结构会向壳体端壁输送低动量流量。这项工作的目的是评估桨叶行相互作用的不稳定性对时间平均流量的影响，尤其是通过平均线速度和3-D RANS /用于设计的混合平面分析。

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