Radial flow turbine guide vane structure coupled with non-axisymmetric end walls

Abstract

The invention relates to a radial flow turbine guide vane structure coupled with non-axisymmetric end walls. The radial flow turbine guide vane structure aims to solve the technical problems of remarkable secondary flow of low-span chord ratio runoff guide vane end walls, relatively large channel vortex size, poor outlet air flow uniformity and the like. A non-axisymmetric concave-convex end wallstructure is adopted at each of the front end walls and the rear end walls of radial flow turbine guide vanes and can be matched with the radial flow turbine guide vanes with the three-dimensional configuration to control the flow channel secondary flow loss more effectively. According to the radial flow turbine guide vane structure, a blade lattice is modified, and specifically, the inner surfaces of the front end walls and the rear end walls are correspondingly arranged as the non-axisymmetric concave-convex end wall structures, so that the flow area of each flow channel is changed, and theair flow pressure difference between the pressure surface on one side of each flow channel and the suction surface on the other side of each flow channel is reduced, so that the secondary flow velocity distribution is affected, the formation and development of the channel vortex are delayed, the channel vortex intensity is reduced, and the reduction of the secondary flow loss is finally realized.

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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