Abstract: 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.

Key words: Blade design, Test turbine, Turbine design, Viscous controlled vortex