A Radial Turbine Guide Vane Structure Coupled with Non-axisymmetric End Walls

Abstract

In order to solve technical problems such as obvious secondary flow on the end wall of the radial flow guide vane with low aspect ratio, relatively large channel vortex size, and poor outlet airflow uniformity, the present invention relates to a radial flow turbine guide vane structure coupled with non-axisymmetric end walls. The non-axisymmetric concave-convex end wall structure is adopted on the front end wall and the rear end wall of the radial turbine guide vane, and can be formed with the radial turbine guide vane having a three-dimensional configuration to more effectively control the secondary flow loss of the flow channel. In the present invention, by modifying the cascade, specifically, setting the inner surfaces of the front end wall and the rear end wall as non-axisymmetric concave-convex end wall structures, the flow area of ​​each flow channel is changed, and the The airflow pressure difference between the pressure surface on one side of each flow channel and the suction surface on the other side is reduced, thereby affecting the secondary flow velocity distribution, delaying the formation and development of channel vortices, reducing the channel vortex intensity, and finally realizing the secondary flow velocity distribution. Reduced secondary flow loss.

Description

technical field [0001] The invention belongs to the field of radial flow turbines in fluid machinery, and relates to a radial flow turbine guide vane structure, in particular to a high-efficiency low aspect ratio three-dimensional radial flow turbine guide vane structure coupled with non-axisymmetric end walls. Background technique [0002] In recent years, radial flow turbines utilizing the pressure energy and thermal energy of the gaseous working medium have been widely used and have various structural types, providing electricity and power for industrial production and public life. In order to make a unit volume of equipment output as much mechanical energy as possible under the same thermal parameters, it is necessary to improve the efficiency of the radial flow turbine. As a kind of rotating machinery, in order to realize the energy conversion and work of the working fluid gas, most radial flow turbines adopt the guide vane structure, which will inevitably form a pressu...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems in the prior art, such as obvious secondary flow on the end wall of the radial flow guide vane with low aspect ratio, relatively large channel vortex size, and poor uniformity of outlet airflow, the present invention proposes a radial flow turbine coupled with a non-axisymmetric end wall. The guide vane structure can effectively control the secondary flow loss of the guide vane end wall of the low-aspect-ratio radial flow turbine, reduce the size of the channel vortex, and improve the uniformity of the outlet airflow, thereby improving the aerodynamic efficiency and working capacity of the radial flow turbine and increasing the radial flow turbine. The utilization efficiency of energy meets the needs of high-efficiency operation of radial turbines and promotes the application of radial turbines in high-efficiency operation systems. This technology makes radial turbines more efficient, and has processing feasibility and broad application prospects.

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