1.5级亚音速试验台透平设计

Design of a 1.5 Stage Subsonic Test Turbine Facility

在可控涡设计的基础上,发展一种粘性可控涡设计思想,通过熵沿径向梯度的变化来考虑粘性及由此产生的二次流等复杂因素对涡轮作功的影响,并应用于1.5级亚音速试验透平设计。根据粘性可控涡设计结果对叶片进行参数化造型,所获得的叶片具有变截面扭叶片等特性,同时导叶和静叶采用后加载叶型设计规律,可满足试验涡轮变工况需求。采用粘性数值模拟对透平进行气动分析,数值结果表明,透平流动较好,动静叶匹配,主流区无大攻角无分离流等现象,具有较高的效率,满足试验台的各种要求。实践证明,该设计方法简单易用,可快速获得性能较好的叶片。建立以可控涡设计、参数化造型和粘性数值模拟为核心的轴流透平设计体系。

On the basis of controlled vortex design,a viscous controlled vortex design method is developed,in which viscosity and other complex factors influencing the turbine work are considered through radial entropy gradient variation,and then applied to 1.5-stage subsonic experimental turbine design.By using parametric modeling,the 3D blades are obtained with tapered and twisted characteristics according to the result of viscous controlled vortex design method.Also the guide vane and stator are designed by using aft-load blade profile design rules,which can meet the need of off-design conditions.Finally viscous numerical simulation is adopted,the results show that the turbine flow is well,the stage match is achieved,and there is no separation flow in the free stream and no large attack angle at the leading edge.All of these indicate the turbine has high efficiency,satisfying the required conditions of the test facility.The practice shows that this method is easy to use,by which the good blades can be acquired quickly.In addition,the axial turbine design system with the core of controlled vortex design,parametric modeling and viscous numerical simulation is established.