Method for determining thickness of blades of hydraulic torque converter based on water-drop-shaped airfoil function

Abstract

The invention discloses a method for determining the thickness of blades of a hydraulic torque converter based on a water-drop-shaped airfoil function. The method comprises the steps that an inner loop line and an outer loop line of a middle flow plane of a certain blade are split into dot matrices; when the normal thickness of a certain dot is calculated, a dot around the dot and a corresponding dot on the corresponding loop line are selected to serve as a group; the normal thickening direction of the dot is calculated through an algorithm; a function value of the corresponding dot of the water-drop-shaped airfoil function is selected to serve as a thickness value of thickening, and a thickness vector is formed; positive pressure surface dots and negative pressure surface dots of the dot are obtained after the dot is thickened, all the dots are subjected to similar operation, and an inner loop pressure surface dot group and an outer loop pressure surface dot group are obtained after thickening; and the blade is formed through the dot groups by means of modeling software, and the thickness of the blade is determined. According to the method, the thickness function which meets the water-drop-shaped airfoil characteristics is converted into the thickness vector and applied to the thickness design of the space blade. The method has the advantages that the thickened blade conforms to the hydrodynamic theory, and meanwhile blade thickness design parameters can be reduced; the blade design accuracy is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of hydraulic torque converters, and relates to a blade modeling method of a turbomachinery, in particular to a blade modeling method of a hydraulic torque converter based on the characteristics of a drop-shaped airfoil and a ruled curved surface. Background technique [0002] The development and design of the hydraulic torque converter is mainly the design of the cascade system. Whether the cascade design is reasonable will directly affect the maximum efficiency, capacity, starting torque ratio and other characteristics of the hydraulic torque converter. Usually, cascade design is carried out in three steps: calculating the blade angle, calculating the blade bone line by conformal transformation method or circulation distribution method, and thickening the blade by conformal transformation method and other methods. Practice has proved that for a hydraulic torque converter, the blades of the turbine and guide...

AI Technical Summary

Problems solved by technology

However, the traditional blade thickening method mostly relies on empirical design, and mostly adopts the equi-inclination projection method. The design process is complex and the coordinate conversion process is distorted. Often the designed blade deviates greatly from the theoretical result, which is likely to cause hydraulic moment change. The theoretical efficiency of the device deviates greatly from the actual efficiency

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