Design method of turbine support plate blade with supporting and flow guiding functions and blade

Abstract

The invention belongs to the field of design of inter-turbine casing support plates in axial-flow turbines, and relates to a design method of turbine support plate blades with supporting and flow guiding functions, the blade ring number and the blade height radius are given firstly, so that the positions and the pitch of the blades are determined, and then according to the supporting structure space needed by an engine, the flow guiding function is achieved. Determining centers and radiuses of small circles at the front and tail edges of the blade according to strength and processing technology requirements; an inlet upper wedge angle and an inlet lower wedge angle of the blade are arranged to ensure that the interior of the front half part of the blade has enough space, an effective air outlet angle and an outlet deflection angle are arranged to realize a flow guide effect on airflow, and an outlet wedge angle is arranged to ensure the thickness requirement of the rear half part of the blade; and then a suction surface control curve and a pressure surface control curve are respectively set to complete the design of the outer envelope line of the blade. According to the design, the blade profile integrates the design of the supporting plate and the guide blade, the front stage flow condition is better adapted, the pneumatic loss is lower, the total efficiency of turbine parts is improved, the axial size of the turbine stage is smaller, the number of components is smaller, the weight is light, and the cost is low.

Description

technical field [0001] The present application belongs to the field of inter-turbine casing support plate design in axial-flow turbines, and in particular relates to a turbine support plate blade design method and blade with both support and flow guiding functions. Background technique [0002] In the field of aero-engines and gas turbines, according to the layout of the fulcrum of the whole machine, there are two types of support for the multi-shaft (≥2) axial-flow turbines, the inter-turbine casing support and the turbine rear casing support. On the one hand, the support is the main force transmission path of the fulcrum, and the bearing force of the bearing seat is transmitted to the turbine casing through the structure of the bearing frame and the tie rod, and on the other hand, it provides the lubrication required for the stable operation of the fulcrum, and the secondary air is guided from the outside of the engine gas turbine. to the internal pivot of the engine. The...

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Problems solved by technology

[0005] The purpose of this application is to provide a design method for turbine support plate blades and blades with both support and flow guiding functions, so as to solve the problems of large aerodynamic loss and large space occupation of the casing between turbines in the prior art

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