Research on the Design Method of a Helium Turbine Curved Blade
The characteristics of helium turbines with high load and low aspect ratio lead to a high proportion of end zone losses in the total losses.In particular,the radial development scale of loss in the end zone of rotor blades is large,and even the main flow will be blocked.In order to optimize the aerodynamic performance and mainstream flow of a helium turbine,a numerical simulation method was used to study the bending design of the moving blade.The positive bending,reverse bending and reverse J-shaped design methods were respectively compared.The research results show that the reverse J-shaped design has the best effect,followed by the reverse bending and the positive bending is the worst.The reverse J-shaped design with 50%bending height and 20° bending angle is the best design point,which not only improves the turbine stage efficiency,optimizes the mainstream flow and enhances the power doing ability,but also has better operating condition characteristics,especially at the low operating condition point with a flow rate of 1.5 kg/s,the efficiency is 2.3 percentage points higher than the original design.
万方数据
维普
