高负荷小型压气机大弯角串列静子特性

针对某小型压气机高负荷轴流级大弯角静子,采用串列叶片技术进行了改型设计.串列静子三维造型引入适度正弯以获得前后叶片的最佳相对位置.通过全三维定常数值模拟得到了原型与串列改型在设计转速下不同工况点的气动性能.结果表明:串列改型静子削弱了原型静子尖部流动分离,级等熵效率提高近3.5%,串列前叶几乎承担了全工况内绝大部分攻角变化,稳定裕度提升2%;改型后的静子可以更为均匀地分配前后叶片的载荷,有利于叶片附面层流动的控制. 

Characteristics of high-turning tandem stator in highly loaded small compressor

A redesigned high-turning stator was studied in a highly loaded small compressor with tandem blades.During three dimensional (3-D) stacking of the tandem stator,the appropriate positive bow was adopted to achieve the best relative location between the front and rear blades.Performance curves of the original and redesigned stages were obtained by 3-D steady numerical simulations at different conditions under the design speed.The results show that separation of the original stator near the casing has been weakened.The adiabatic efficiency increases by 3.5% approximately at the design point;the front blade withstands main variations of stator's incidence,and the stability margin also increases by 2%.The redesigned tandem stator can distribute the high-turning blade loading along the axial chord more uniformly,so it is beneficial for the flow control of the blade boundary layer.