CN-121980635-A - Impeller molded line precompensation method of high-speed miniature centrifugal pump based on fluid-solid coupling analysis

CN121980635ACN 121980635 ACN121980635 ACN 121980635ACN-121980635-A

Abstract

The invention relates to the technical field of high-speed micropumps, and discloses a high-speed miniature centrifugal pump impeller molded line precompensation method based on fluid-solid coupling analysis, which comprises the steps of constructing an impeller parameterized geometric model and extracting design variables, constructing a fluid-solid coupling sample library by adopting an optimized Latin hypercube sampling strategy, constructing a high-precision full-field deformation prediction model by combining a Gaussian process regression by using an intrinsic orthogonal decomposition technology, constructing a multi-objective optimization function based on the full-field deformation prediction model, optimizing by using a non-dominant sorting genetic algorithm to obtain a target thermal geometry considering both hydraulic performance and structural safety, and finally carrying out reverse iterative solution on the target thermal geometry by using a geometry-load mixed correction algorithm to obtain a cold manufacturing geometry in a static state. The invention obviously reduces the calculation cost through the agent model, eliminates the adverse effect of fluid-solid coupling deformation on the impeller performance from the manufacturing end by utilizing a reverse pre-compensation strategy, and effectively improves the actual operation efficiency and the lift stability of the high-speed miniature centrifugal pump.

Inventors

LIANG JUN
ZHANG ZHE
Zhou Gaozhe

Assignees

浙江新涛智控科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20251222

Claims (8)

1. The impeller profile precompensation method of the high-speed miniature centrifugal pump based on fluid-solid coupling analysis is characterized by comprising the following steps: s1, constructing an impeller parameterized geometric model, and extracting a design variable vector; s2, constructing a fluid-solid coupling sample library, performing fluid-solid coupling (FSI) simulation extraction on each sample to obtain stable response data and constructing a training data set; S3, constructing and training a full-field deformation prediction model based on the training data set; S4, establishing a multi-objective optimization function based on the full-field deformation prediction model, and obtaining a target thermal state geometry by using a non-dominant ordering genetic algorithm; s5, performing impeller geometric reverse pre-compensation on the target thermal geometry based on a geometric-load mixing correction (GLHC) algorithm to obtain the cold manufacturing geometry.
2. The impeller line precompensation method of the high-speed miniature centrifugal pump based on fluid-solid coupling analysis of claim 1, wherein the method comprises the following steps: the construction of the impeller parameterized geometric model is specifically as follows: constructing a hub and wheel cover meridian plane profile according to a third-order Bezier curve, generating a blade bone line by defining a distribution rule of a blade placing angle beta along a meridian streamline, and superposing blade thickness distribution on a bone line curved surface to construct an impeller parameterized geometric model; The design variable vector is: , wherein, Is the inlet mounting angle of the blade, Is the placement angle of the outlet of the blade, The wrap angle of the blade is the wrap angle of the blade, Is the maximum thickness of the blade.
3. The impeller line precompensation method of the high-speed miniature centrifugal pump based on fluid-solid coupling analysis of claim 2, which is characterized by comprising the following steps: the method for establishing the fluid-solid coupling sample library comprises the following steps: Space filling sampling within the definition range of the design variable vector X by adopting a strategy of Optimizing Latin Hypercube (OLHS) to generate a test design matrix S= Wherein A design parameter vector representing an ith sample point, N representing the total number of samples; the stability response data includes hydraulic efficiency Maximum stress of lift H and blade Three-dimensional node displacement field data 。
4. The impeller line precompensation method of the high-speed miniature centrifugal pump based on fluid-solid coupling analysis, which is characterized in that: the establishment process of the full-field deformation prediction model comprises the following steps: S3.1, based on training data set, aiming at hydraulic efficiency Lift H and maximum stress of blade An independent Gaussian process regression prediction model is respectively established and trained, and a response function to be predicted is as follows: Wherein, the Is a constant term which is used to determine the degree of freedom, Is a random process with zero mean and covariance structure; s3.2, three-dimensional node displacement field data based on fluid-solid coupling sample library After being arranged to form a snapshot matrix, the snapshot matrix performs eigen-orthogonal decomposition (POD) dimension reduction, which is expressed as a k-order main mode Is a linear combination of (a): Wherein, the The mode coefficient of the ith order; Then for each modal coefficient Training a mode coefficient Gaussian process regression model respectively; and S3.3, respectively carrying out precision evaluation and self-adaptive updating on each of the trained hydraulic efficiency Gaussian process regression prediction model, the lift Gaussian process regression prediction model, the blade maximum stress Gaussian process regression prediction model and the modal coefficient Gaussian process regression prediction model by adopting a left-behind cross validation method, and triggering a self-adaptive point adding strategy if the error exceeds a preset threshold value, expanding a sample library and retraining the model.
5. The fluid-solid coupling analysis-based high-speed miniature centrifugal pump impeller molded line precompensation method is characterized by comprising the following steps of: The multi-objective optimization function includes: The objective function F 1 (X) according to the maximization efficiency is: Wherein, the (X) a trained hydraulic efficiency Gaussian process regression prediction model; The objective function F 2 (X) according to the minimized lift is: Wherein, the In order to train a regression prediction model of the head Gaussian process, The lift is designed; Nonlinear constraint: Wherein, the Representing a trained blade maximum stress Gaussian process regression prediction model, Representing the yield strength of the impeller material; representing a safety factor.
6. The fluid-solid coupling analysis-based high-speed miniature centrifugal pump impeller line precompensation method is characterized by comprising the following steps of: The target thermal geometry is obtained by solving the multi-objective function through a non-dominant order genetic algorithm (NSGA-II) to obtain a Pareto non-dominant solution set, and selecting an inflection point solution as the target thermal geometry Xt.
7. The fluid-solid coupling analysis-based high-speed miniature centrifugal pump impeller line precompensation method is characterized by comprising the following steps of: the geometric reverse precompensation process of the impeller comprises the following steps: The method comprises the steps of taking a target thermal state geometry Xt as a target form, and reversely correcting the cold state manufacturing geometry of an impeller by adopting an iterative mode combining fluid-solid coupling simulation and cold state geometry reverse correction based on a geometry-load mixed correction algorithm until the actual running shape And the target thermal state geometry Xt meets a preset precision manufacturing tolerance threshold, so that a corresponding cold state manufacturing geometry is obtained.
8. The fluid-solid coupling analysis-based high-speed miniature centrifugal pump impeller line precompensation method of claim 7, characterized by: the cold state geometric reverse correction is as follows: Wherein, the In order to relax the factor of the process, For the cold geometry of the current iteration, Is of the actual running shape A full field node deviation vector between the target thermal geometry Xt; the precision manufacturing tolerance threshold is an infinite norm of the deviation vector 。

Description

Impeller molded line precompensation method of high-speed miniature centrifugal pump based on fluid-solid coupling analysis Technical Field The invention belongs to the technical field of high-speed micropumps, and particularly relates to a high-speed miniature centrifugal pump impeller molded line precompensation method based on fluid-solid coupling analysis. Background High-speed micro centrifugal pumps are used as a core power source for aerospace fuel delivery, micro propulsion systems and biomedical auxiliary circulation devices, and generally operate at extremely high rotational speeds. Limited by the small size and Fluid delivery requirements, impellers of such pumps often employ thin-walled structures with large tortuosity, and in actual operation, impellers face severe Fluid-to-Structure Interaction (FSI) challenges. On the one hand, the huge centrifugal load causes radial stretching and bending deformation of the blade, and on the other hand, the pressure difference generated by hydrodynamic pressure on the surface of the blade causes bending deformation. For low-rigidity miniature impellers, the nonlinear elastic deformation can cause drastic changes of blade tip clearances, flow separation and sharp attenuation of hydraulic efficiency, and even cause structural resonance, fatigue failure and other phenomena. The conventional design method mainly has the following limitation that the conventional design is based on rigid body assumption, and strength check is only carried out at the later stage. If deformation exceeds standard, a method for increasing the thickness of the blade is generally adopted, so that fluid blockage is increased, efficiency is reduced, larger centrifugation is possibly introduced due to mass increase, traditional design and checking modes depend on experience of engineers to repeatedly try mistakes, accurate target appearance after deformation is difficult to obtain through limited iterations, and although full-physical-field fluid-solid coupling (FSI) simulation can accurately predict deformation, huge calculation resources are needed for directly embedding the deformation into an optimization cycle, single optimization can take a plurality of weeks, and the requirement of engineering research and development period is difficult to meet. In view of this, there is a need for improvements in existing high-speed miniature centrifugal pump impeller line precompensation methods. Disclosure of Invention The technical problem to be solved by the invention is to provide a high-speed miniature centrifugal pump impeller molded line precompensation method based on fluid-solid coupling analysis, which is used for realizing accurate prediction of fluid-solid coupling with lower calculation cost and eliminating deformation influence reversely from a manufacturing end. In order to solve the technical problems, the invention provides a high-speed miniature centrifugal pump impeller molded line precompensation method based on fluid-solid coupling analysis, which comprises the following steps: s1, constructing an impeller parameterized geometric model, and extracting a design variable vector; s2, constructing a fluid-solid coupling sample library, performing fluid-solid coupling (FSI) simulation extraction on each sample to obtain stable response data and constructing a training data set; S3, constructing and training a full-field deformation prediction model based on the training data set; S4, establishing a multi-objective optimization function based on the full-field deformation prediction model, and obtaining a target thermal state geometry by using a non-dominant ordering genetic algorithm; s5, performing impeller geometric reverse pre-compensation on the target thermal geometry based on a geometric-load mixing correction (GLHC) algorithm to obtain the cold manufacturing geometry. As the improvement of the impeller line precompensation method of the high-speed miniature centrifugal pump based on fluid-solid coupling analysis, the invention has the advantages that: the construction of the impeller parameterized geometric model is specifically as follows: constructing a hub and wheel cover meridian plane profile according to a third-order Bezier curve, generating a blade bone line by defining a distribution rule of a blade placing angle beta along a meridian streamline, and superposing blade thickness distribution on a bone line curved surface to construct an impeller parameterized geometric model; The design variable vector is: , wherein, Is the inlet mounting angle of the blade,Is the placement angle of the outlet of the blade,The wrap angle of the blade is the wrap angle of the blade,Is the maximum thickness of the blade. As the further improvement of the impeller line precompensation method of the high-speed miniature centrifugal pump based on fluid-solid coupling analysis, disclosed by the invention: the method for establishing the fluid-solid coupling sample library comprises the