Separation Control on a Low-Pressure Turbine Blade using Microjets
Separation Control on a Low-Pressure Turbine Blade using Microjets
复制标题
使用微射流对低压涡轮叶片进行分离控制
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
F. Alvi
中科院分区：
文献类型：
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作者：
E. Fernandez;Rajan Kumar;F. Alvi
在低雷诺数下，低压涡轮机叶片上发生的流动分离由于其对发动机性能的有害影响而引起关注。在本研究中，微射流驱动，低质量，高动量的设备，的效果，证明了消除分离的低压涡轮机叶片在很宽的雷诺数范围内使用一系列的补充诊断，其中包括表面压力，速度场，和尾流损失测量。本研究中使用的美国空军研究实验室L1A低压涡轮机叶片是一种高后载叶型，在低雷诺数下，在约60%轴向弦长处发生非再附着分离。基线叶片压力分布和尾流损失系数测量结果表明，在稳定进口条件下，自由叶栅湍流强度为1%时，基于轴向弦的雷诺数小于50，000时，叶片经历非重附着分离。基于微射流的控制系统
Flow separation that occurs over low-pressure turbine blades at low Reynolds numbers has been a cause of concern due to its detrimental effect on engine performance. In the present study, the effect of microjet actuation, a low-mass, high-momentum device, is demonstrated for the elimination of separation on a low-pressure turbine blade over a wide range of Reynolds numbers using a range of complementary diagnostics, which include the surface pressure, velocity field, and wake-loss measurements. The U.S. Air Force Research Laboratory L1A low-pressure turbine blade used in this study is a highly aftloaded profile that experiences a nonreattaching separation at approximately 60% axial chord at low Reynolds numbers. Baseline blade pressure distributions as well as wake-loss coefficient measurements show that the blade experiences nonreattaching separation for Reynolds numbers based on axial chord less than 50,000 for a freestream turbulence intensity of 1% with steady inlet conditions. Microjet-based control ...