Research On Rotor Design Of Radial Inflow Micro Turbine By Numerical Simulation

On the micro turbine engine progressing background, researched on radial inflow micro turbine rotor design. By 3-D viscous code, detailed investigations on design parameters for blade angle of the rotor, inlet angle and length on flowing direction are present.Firstly, compare with the performance of 6 different blade angle distributing methods, and give the influence of the rotor by changing inlet angle and length. The results show that it will get good performance with increasing blade angle, 0 degree at root, 30 degree at tip and 30mm length.Secondly, the influence to the inner flow field and the performance of two different diameters micro turbine rotor is researched by changing blade number. The results show that it will get better performance when blade number is between 14 to 17 for 76mm diameter and 10 for 38mm diameter rotor.Thirdly, the influence of the inner flow field and the performance of micro turbine rotor is analyzed by changing splitter's length and direction. The results show that it will increase efficiency and specific work of the rotor by adding splitter's length, and the performance is better when blades'circumference distances are equal.At last, comparing with the highest efficiencies of rotor with and without splitter, it shows that with splitter, the rotor's mass increases 0.5%, the efficiency adds about 1% specific work increases 0.9%, and weight is lower than without splitter.Sam up, considering all the factor, a radial inflow micro turbine rotor has been designed. The performance of the rotor is: mass reaches 0.4kg/s, efficiencies is 85% and specific work is more than 210kJ/kg at 125000r/min, that can meet the design target.