Method for determining wing-shaped oblique-flow cooling fan of automobile engine

Abstract

The invention discloses a method for determining a wing-shaped oblique-flow cooling fan of an automobile engine. The method is implemented by the following steps: obtaining essential parameters of a plane blade lattice, obtaining the definite shape of a meridian plane, calculating a theoretical total pressure rise value, calculating flow velocity distribution, mapping and obtaining an equivalent velocity triangle, selecting blade profile parameters, performing correction compensation on the wing-shaped blade profile, calculating blade profile parameters, calculating blade coordinate values, fitting to obtain a blade cross-sectional line by using the obtained blade coordinate values, superposing individual cross-sectional planes in the radial direction to form a blade profile, and finally determining the wing-shaped oblique-flow cooling fan. The method can not only ensure the smoothness of curved surface of the fan but also meet the requirements for pneumatic property and process, greatly reduces the design cycle, facilitates the modification of the following design, and greatly reduces the development cost.

Description

technical field [0001] The invention belongs to the technical field of automobile engine equipment manufacturing, and relates to a method for determining an airfoil oblique flow cooling fan of an automobile engine. Background technique [0002] The design and performance of the automobile engine cooling fan directly lead to the engine running effect, and often become the key components that hinder the successful development of the engine, directly affecting the overall development of the engine. At the same time, it has a direct impact on the heat dissipation effect, noise, fuel economy and engine power consumption of the engine. [0003] The design of the cooling system is determined by the basic structure of the entire car, so it is difficult to independently establish a set of theories. Therefore, it is generally designed with the approximate calculation method first, and then conducts comprehensive experiments on various factors of the cooling system and the actual vehi...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for determining the oblique flow cooling fan of an automobile engine airfoil, which solves the unreasonable optimal flow velocity distribution in the prior art. The trial and error method is used to verify the fan. The design result has large deviation and the design change cycle Long, time-consuming and labor-intensive problems in the design and production process

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