One-Dimensional Design Method for Three-Dimensional Turbine Based on Radial Speed Ratio Optimization

In the design process of modern turbine blades, the geometric parameters along the radial distribution need to be constantly adjusted, and the design cycle is long. In order to solve this problem, this paper constructs a one-dimensional design method of three-dimensional blade: the blade flow channel is divided into several sub-flow channels along the radial direction, and each sub-flow channel is designed in one dimension to obtain its optimal speed ratio and geometric angle. Then, the one-dimensional design results of each sub-flow channel are superimposed along the radial direction to construct a three-dimensional blade. Using the boundary conditions of the last stage of an F-class gas turbine, the blade is redesigned by this method, and the parameters such as the static blade outlet pressure and the backward angle in the numerical simulation results are used as additional constraints for fine design. The results show that compared with the original design, the optimized turbine has a slight increase in the loss in some areas of the rotor, the flow rate is reduced by 0.26%, but the outlet kinetic energy loss is significantly reduced. At the same time, the wheel efficiency is increased by 1.7%, the total-to-total efficiency is increased by 0.37%, and the shaft work is increased by 1.47%. © 2024 Science Press. All rights reserved.