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导流叶片两端间隙不同分配对可调向心涡轮性能影响

Keywords: 可调向心涡轮,叶顶间隙,涡轮性能,流动损失

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Abstract:

针对现有可调涡轮产品缺少喷嘴环叶片两端间隙约束机构现状,选取三种典型喷嘴环叶片间隙分布模型,用数值方法研究喷嘴环叶片两端间隙不同分配对涡轮级性能影响,并找出导致涡轮性能变化的相关机理,为提高可调向心涡轮在非设计工况下性能提供参考.研究结果表明:在小开度情况下导流叶片两端间隙变化导致涡轮级效率差别至少为4%,且流动损失变化主要集中在转子段;导流叶片间隙泄漏流中气体气流角小于主流气体,因此间隙分布变化可以改变转子叶片吸力面前缘附近分离涡位置,从而改变转子叶轮通道内部流动损失,最终影响涡轮性能.

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