多级吸附式压气机末级静子叶型构型方法研究

On the Airfoil Construction Method for the Outlet Vane in a Multi-Stage Aspirated Compressor

针对某多级低反力度吸附式压气机末级静子较薄,存在叶片抽吸结构设计困难的问题,设计了三种叶型构型——传统双圆弧叶型、优化叶型以及串列静子作为末级静子主流区叶型备选方案。借助数值模拟的方法,详细对比分析了三种构型方案的变工况性能及其内部流场结构特点。结果表明,当叶型扩压因子超出常规设计范畴时,传统双圆弧叶型设计点处于损失急剧增加的位置;优化叶型通过合理调整叶型内部压力场分布,显著降低了设计点附近及正冲角下的总压损失,但大负冲角下,压力面分离损失加剧;基于原型双圆弧叶型参数设计的串列静子具有更佳的气动性能,在全工况范围内,损失均低于单列叶片。

Three different airfoil constructions—traditional double circular airfoil,optimized airfoil and tandem airfoil were considered to be as the alternatives for the mainflow airfoil of the outlet vane in a highly multi-stage low-reaction aspirated compressor due to the fact that the outlet vane was too thin to implement the aspiration schemes.The numerical method was applied to compare their aerodynamic performance and inner flow-filed characteristics at various operating conditions.As a result,the aerodynamic design point of the traditional double circular airfoil is located at the place where the loss has a sharp increase as the airfoil diffusion factor exceeds the routine design scope.By adjusting the distribution of the pressure filed reasonably,the optimized airfoil could reduce the total pressure loss significantly at the design point and positive incidences,however,the separation loss on the pressure side is aggravated at large negative incidence.The tandem airfoil designed based on the double circular airfoil has the best performance and the loss is lower than that of the single airfoil at the whole operating conditions.