Angle of attack and nose shape of bodies are key factors that asymmetric vortex occurs over slender bodies.
迎角、旋成体的外形，尤其是头部的几何形状是细长前体出现非对称涡的关键因素。
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The results show that the performance of optimized fan is improved by lowering the energy loss which caused by the secondary flow vortex, the volute tongue, the wake-jet and the angle of attack.