一种平面叶栅反设计方法的改进与验证
Improvement and validation of a planar cascade inverse design method
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摘要: 介绍了一种平面叶栅反设计方法,假设因压力作用有一流体微元沿槽道中心流线运动,设计参数包括:叶栅进/出口气流角、截面半径、叶型载荷分布和厚度分布等.为完善原设计方法,提出了新的理论,用于获得必要的密度分布曲线;改进了前、后倒圆造型算法,提升了叶栅气动性能;为验证改进后的设计方法,重新设计了德国Aachen涡轮静叶叶栅.Abstract: With the hypothesis that one fluid element moves along a curved average streamline in cascade passage due to the pressure force acting on the element,a feasible planar cascade inverse design method was introduced;the design parameters for yielding desired cascade geometry mainly include: inlet/outlet flow angles,section radius,prescribed profile loading and thickness distribution along axial chord.To supplement and improve original design method,a new theory was put forward,in which the density distribution along axial chord could be calculated,and the algorithm with leading/trailing circles was modified with obvious improvement of cascade aerodynamic performance.To validate the improved cascade design method,the Aachen turbine cascade from Germany was re-designed in this paper.
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Key words:
- planar cascade /
- inverse design /
- density distribution /
- leading/trailing circles
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