Elliptic blade edge-modeling system and elliptic blade edge-modeling method for impellers

Abstract

The invention provides an elliptic blade edge-modeling system for impellers, which comprises a data input module, a coordinate transformation module, a two-dimensional plane curve elliptic transition module, a three-dimensional curved surface generation module and a data output module, which are used for first reading blade surface data points and blade edge parameters, then transforming and mapping the coordinates of the blade data points into a two-dimensional plane (m, r * Theta), using B-splines to fit the two-dimensional data points to obtain a curve (1) and a curve (2), first generating an initial ellipse on the bases, then iteratively generating a final ellipse and a blade surface and finally outputting impeller data. The invention also provides a corresponding method. The invention provides a modeling design method for a variable-axial ratio elliptic blade edge for the first time, achieves an impeller-modeling program, and can automatically generate an impeller under the conditions of given impeller data points and blade edge shape parameters. The calculation efficiency of a programmed algorithm is high, operation is easy, and the invention can be applied in the three-dimensional modeling design of various impellers.

Description

technical field [0001] The present invention relates to a method in the technical field of computer aided design (Computer Aided Design, CAD), in particular to an elliptical blade edge modeling system and method of an impeller. Background technique [0002] The impeller and rotor are two important components of turbomachinery. The impeller is used in the compressor to convert the rotational mechanical energy into the internal energy and pressure energy of the gas. The rotor is used in the turbine, and its function is just opposite to that of the impeller, which is to convert the internal energy and pressure energy of the gas into rotational mechanical energy. At present, the centrifugal compressor is developing towards the direction of single-stage high pressure ratio, high efficiency and large flow. However, the large-scale also brings a series of problems such as unit design, manufacturing, operating life and reliability evaluation. For example, the leading edge region ...

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Problems solved by technology

[0004] However, it is not easy to achieve a smooth connection between the elliptical blade edge and the pressure surface and suction surface, and the blade edge does not exceed the specified cross-section.

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