CN-121659488-B - Axial flow fan blade design method, system, equipment and storage medium

CN121659488BCN 121659488 BCN121659488 BCN 121659488BCN-121659488-B

Abstract

The present disclosure provides a method, system, apparatus, and storage medium for designing axial flow fan blades. Based on the target parameters defining the overall performance and structure of the axial flow fan, a corresponding target performance relationship is calculated and generated for at least one radial position of the fan blade, so as to characterize the interrelationship between at least two aerodynamic parameters. And taking the target performance relationship and a preset geometric constraint condition as filtering conditions, screening out airfoil sections meeting design requirements of performance and geometric shape from an airfoil performance database, and connecting the airfoil sections at different radial positions to generate a complete fan blade surface. The method converts the postpositive performance index for verification in the traditional flow into the prepositive constraint condition for screening, avoids repeated performance simulation or physical test on each candidate geometrical scheme, thereby obviously shortening the development period of fan blades and reducing the development cost.

Inventors

LIU FUSONG
ZHOU YU
CHEN LIANG
LI JIAN
LIU YAOWEN
ZHENG LIQIANG

Assignees

杭州康钡电机有限公司

Dates

Publication Date: 20260508
Application Date: 20260209

Claims (9)

1. The design method of the fan blade of the axial flow fan is characterized by comprising the following steps: obtaining target parameters for limiting the overall performance and structure of the axial flow fan; calculating and generating a corresponding target performance relationship for at least one radial position of the fan blade based on the target parameter; filtering an airfoil performance database containing a plurality of airfoil profiles based on the target performance relationship and a preset geometric constraint condition to identify one or more airfoil profiles that simultaneously satisfy the target performance relationship and the geometric constraint condition; wherein the target performance relationship characterizes a correlation between at least two aerodynamic parameters; the calculating to generate a corresponding target performance relationship for at least one radial position of the fan blade based on the target parameter includes: Calculating a plurality of discrete data points based on the target parameter, each data point corresponding to a set of values of the aerodynamic parameter; fitting the plurality of discrete data points by adopting a preset fitting method to generate a continuous function representing the target performance relationship; The airfoil profile meeting the target performance relationship and the geometric constraint condition at the same time refers to that if an actual performance curve of the airfoil profile, which is used for representing the relationship between the lift coefficient and the Reynolds number under different attack angles, can intersect with a function curve corresponding to the continuous function or pass through in a very close neighborhood, the airfoil profile is considered to meet the target performance relationship and the geometric constraint condition.
2. The axial flow fan blade design method of claim 1, wherein the geometric constraint condition is a differential constraint applied based on a position type of the radial position; And when the position type is a non-blade tip area, applying a second geometric constraint.
3. The method of designing an axial flow fan blade of claim 2, wherein the first geometric constraint includes a limit on airfoil profile thickness; the second geometric constraint includes a continuity constraint on the airfoil section maximum thickness position or maximum camber position relative to an adjacent radial position.
4. The method of designing an axial fan blade of claim 1, wherein the aerodynamic parameters include a lift coefficient and a reynolds number.
5. The method of designing an axial flow fan blade according to claim 1, further comprising: sorting the plurality of airfoil sections based on a third performance index if a plurality of airfoil sections are identified that simultaneously satisfy the target performance relationship and the geometric constraint condition; and selecting the airfoil profile with the optimal sequencing result as a final design.
6. The method of claim 5, wherein the third performance index is a lift-drag ratio.
7. An axial fan blade design system, the system comprising: The parameter acquisition module is used for acquiring target parameters for limiting the overall performance and structure of the axial flow fan; The data processing module is used for calculating and generating a corresponding target performance relation for at least one radial position of the fan blade based on the target parameters; the result generation module is used for filtering an airfoil performance database containing a plurality of airfoil profiles based on the target performance relation and the geometric constraint condition so as to identify one or more airfoil profiles which simultaneously meet the target performance relation and the geometric constraint condition; wherein the target performance relationship characterizes a correlation between at least two aerodynamic parameters; The calculating to generate a corresponding target performance relationship for at least one radial position of the fan blade based on the target parameter includes: Calculating a plurality of discrete data points based on the target parameter, each data point corresponding to a set of values of the aerodynamic parameter; fitting the plurality of discrete data points by adopting a preset fitting method to generate a continuous function representing the target performance relationship; The airfoil profile meeting the target performance relationship and the geometric constraint condition at the same time refers to that if an actual performance curve of the airfoil profile, which is used for representing the relationship between the lift coefficient and the Reynolds number under different attack angles, can intersect with a function curve corresponding to the continuous function or pass through in a very close neighborhood, the airfoil profile is considered to meet the target performance relationship and the geometric constraint condition.
8. A computer device comprising a processor and a memory and a computer program stored on the memory and executable on the processor, the processor implementing the axial fan blade design method of any one of claims 1-6 when the program is executed.
9. A computer readable storage medium storing at least one instruction for execution by a processor to implement the axial fan blade design method of any one of claims 1-6.

Description

Axial flow fan blade design method, system, equipment and storage medium Technical Field The disclosure relates to the technical field of ventilation and refrigeration, in particular to a method, a system, equipment and a storage medium for designing fan blades of an axial flow fan. Background The core component of the axial flow fan is the geometric surface design of the fan blade, which directly determines the overall performance of the fan, including key indexes such as air quantity, pressure, efficiency, noise and the like. In conventional axial flow fan blade design processes, an engineer is typically required to empirically construct an initial three-dimensional fan blade geometric model, and then verify the aerodynamic performance of the model by computational fluid dynamics (Computational Fluid Dynamics, CFD) simulation or physical testing. Whether CFD simulation or physical testing is used, if the verification result fails to reach the preset design goal, the engineer must return to the original design step, correct the geometric model by analysis of the verification result, and then perform performance verification again. This design-correction-verification process typically requires multiple iterations to converge to an acceptable design, consumes significant computing resources, has a lengthy development cycle, and has uncertainty in the design results. Disclosure of Invention The disclosure provides a method, a system, equipment and a storage medium for designing axial flow fan blades, which can solve the problems of huge calculation resource consumption, long development period and uncertainty of design results caused by repeated design, correction and verification processes by virtue of experience of engineers in the prior art. The technical scheme of the present disclosure is realized as follows: In a first aspect, the present disclosure provides a method for designing an axial flow fan blade, the method comprising: obtaining target parameters for limiting the overall performance and structure of the axial flow fan; Calculating and generating a corresponding target performance relation for at least one radial position of the fan blade based on the target parameter; Filtering an airfoil performance database containing a plurality of airfoil sections based on the target performance relationship and a preset geometric constraint condition to identify one or more airfoil sections which simultaneously meet the target performance relationship and the geometric constraint condition; wherein the target performance relationship characterizes a correlation between at least two aerodynamic parameters. In a second aspect, the present disclosure provides an axial flow fan blade design system, the system comprising: The parameter acquisition module is used for acquiring target parameters for limiting the overall performance and structure of the axial flow fan; the data processing module is used for calculating and generating a corresponding target performance relation for at least one radial position of the fan blade based on the target parameters; the result generation module is used for filtering an airfoil performance database containing a plurality of airfoil profiles based on the target performance relationship and the geometric constraint condition so as to identify one or more airfoil profiles which simultaneously meet the target performance relationship and the geometric constraint condition; wherein the target performance relationship characterizes a correlation between at least two aerodynamic parameters. In a third aspect, the present disclosure provides a computer device, including a processor, a memory, and a computer program stored on the memory and executable on the processor, where the processor implements the method for designing fan blades of an axial flow fan according to the first aspect when executing the program. In a fourth aspect, the present disclosure provides a computer readable storage medium storing at least one instruction for execution by a processor to implement the axial fan blade design method of the first aspect. The present disclosure provides a method, system, apparatus, and storage medium for designing axial flow fan blades. Firstly, obtaining target parameters defining the overall performance and structure of an axial flow fan, and calculating and generating a corresponding target performance relation for at least one radial position of a fan blade based on the target parameters so as to represent the interrelationship between at least two aerodynamic parameters. The target performance relationship is used as a performance constraint condition, the airfoil performance database is filtered together with a preset geometric constraint condition, airfoil sections meeting design requirements of performance and geometric shape can be screened, and the airfoil sections at different radial positions are connected to generate a complete fan blade surface. The method converts