Mean-line-based blade front and back edge fitting and section line smooth reconstruction method

A section line, leading and trailing edge technology, applied in the field of blade leading and trailing edge fitting based on the mid-arc line and smooth reconstruction of section lines, can solve the problems of poor practicability

Inactive Publication Date: 2016-10-12
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0005] In order to overcome the shortcomings of poor practicability of the existing methods, the present invention provides a met

Method used

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  • Mean-line-based blade front and back edge fitting and section line smooth reconstruction method
  • Mean-line-based blade front and back edge fitting and section line smooth reconstruction method
  • Mean-line-based blade front and back edge fitting and section line smooth reconstruction method

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Embodiment Construction

[0023] refer to figure 1 . The specific steps of the method for fitting the front and rear edges of the blade based on the center arc and the smooth reconstruction of the section line in the present invention are as follows:

[0024] Step 1. Select a certain section line measurement point of the blade as the research target, where the leading edge point set P l is the fitting object. Select the original leaf back curve C v and leaf pot curve C c is the auxiliary curve.

[0025] Step 2. On the leaf back curve C v and leaf pot curve C c On the basis of , use the middle arc and Gauss-Newton method to calculate the leading edge point set P l Fitting is carried out to obtain the leading edge curve C that satisfies the smooth connection between the leaf pot, the leaf back and the leading edge l , the specific process is as follows:

[0026] ① For the initial leaf back curve C v and leaf pot curve C c Apply the middle arc extraction algorithm to get the initial middle arc ...

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Abstract

The invention discloses a mean-line-based blade front and back edge fitting and section line smooth reconstruction method. The method is used for solving the technical problem that an existing method is poor in practicability. According to the technical scheme, on the basis of a fitting problem of front and back edge measuring points, a restrained least square fitting method is built for fitting of front and back edges meeting the design requirement. Different from unrestraint least square method front and back edge fitting, the method adopts a mean line as constraint conditions for front and back edge fitting, the restrained least square method is built, a Gauss-Newton method is used for iterative solving, finally, a fitting front and back edge curve approximating the designed front and back edges is obtained, front edge radius errors are lowered to 0.007% from original 0.670%, and the back edge radius errors are lowered to 0.062% from original 1.018%. The fitting front and back edge and the blade back and blade basin achieve smooth connection, and the smooth section line curve is built. The method has the advantages of being high in calculation precision, high in convergence rate and effective in constraint.

Description

technical field [0001] The invention belongs to the field of manufacturing gas turbine blades, in particular to a method for fitting front and rear edges of a blade based on a center arc and smooth reconstruction of a section line. Background technique [0002] The blade is an important part in the aero-engine, and it is the main part of the compressor and the turbine. The working principles of the two are different, but the requirements for high-quality blades are the same. The blades with unqualified quality not only cannot meet the design tolerance requirements for contour errors, but also cannot meet the design requirements for aerodynamic parameters. As a result, not only the compression efficiency of the compressor is low, but also the working state of the turbine is affected. Therefore, manufacturing high-quality blades is an urgent problem to be solved in the current aviation manufacturing industry. [0003] Accurate modeling of blade shape is not only a guarantee...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/15
Inventor 侯尧华张定华张莹吴宝海罗明
Owner NORTHWESTERN POLYTECHNICAL UNIV
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