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Fluid machinery checking method

A fluid machinery and calibration technology, applied in computer-aided design, instrumentation, geometric CAD, etc., can solve problems such as lack of calculation accuracy, and achieve the effect of reducing the number of iterations, optimizing design, and improving reliability

Active Publication Date: 2021-05-28
ZHEJIANG PUMP GENERAL WORKS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Based on the analysis based on the steady calculation, the calculation accuracy is lacking

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0179] According to a specific embodiment of the present invention, the fluid domain calculation method of the present invention will be described in detail below.

[0180] Import the fluid domain grid into the fluid dynamics calculation software for fluid domain calculation, and obtain the aerodynamic parameters of the fluid domain; wherein, the time for the rotor to rotate through a blade channel is divided into multiple discrete time steps;

[0181] The fluid domain calculation includes the following steps:

[0182] Preset the total pressure value and the total temperature value of the equipment inlet in the software;

[0183] Preset the static value of the outlet of the equipment in the software;

[0184] Set the working medium as water or gas;

[0185] Given the speed of different working conditions, the speed range is 30% to 120% of the design working conditions;

[0186] The turbulence model selects the RNGκ-ε model;

[0187] Using the three-dimensional compressible...

Embodiment 2

[0212] According to a specific embodiment of the present invention, the calculation method of the solid domain of the present invention will be described in detail below.

[0213] The solid domain grid is imported into the solid mechanics calculation software for solid domain calculation, and the rotational speed of different working conditions is given to obtain the centrifugal prestress distribution of the blade.

[0214] Solid domain calculation includes the following steps:

[0215] Set the shaft part as fixed;

[0216] Set the working speed;

[0217] Using the implicit dynamic analysis method, the finite element discrete method is used to solve the governing equations, and the centrifugal prestress distribution of the blade is calculated.

[0218] The calculation of blade bearing centrifugal prestress distribution includes the following steps:

[0219] The mass of the blade is obtained according to the geometric and physical three-dimensional model of the blade and the...

Embodiment 3

[0228] According to a specific embodiment of the present invention, the calculation method of the air flow alternating stress distribution of the blade of the present invention under the prestressed state will be described in detail below.

[0229] According to the amplitude distribution field P of the pulsating flow field corresponding to the K-order exciting force on the surface of each blade k (x, y, z) and phase distribution field and the centrifugal prestress distribution of the blade, and the air flow alternating stress distribution of the blade under the prestressed state is obtained,

[0230] Specifically include the following steps:

[0231] S7100: The aerodynamic load P obtained in the form of amplitude and phase of each node calculated in S500 k (x, y, z) and Written in the form of real and imaginary parts;

[0232] S7200: According to the centrifugal prestress distribution of the blades calculated in S600, the surface pressure of the fluid domain is mapped to...

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Abstract

The invention provides a fluid machinery checking method and system, and belongs to the technical field of fluid machinery. The method comprises the following steps: establishing a solid domain model and a fluid domain model according to parameters of designed equipment, performing grid division, performing three-dimensional unsteady analysis on a fluid domain to obtain an unsteady aerodynamic load on the surface of the blade, further obtaining the surface pressure of each point, mapping the surface pressure of the fluid domain to the surface of the solid domain through node coordinates, and further obtaining the steady-state response of the blade structure; enabling a solid domain to adopt an implicit dynamic analysis method, calculating centrifugal prestress distribution borne by the blade, and further obtaining airflow bending stress of each point of the blade. The method can reflect transient three-dimensional stress conditions of the blade of an acting part in real time, a fatigue judgment method with a Goodman graph as a checking criterion is adopted, the fatigue life of the blade can be accurately judged in the blade design stage, the weak link of the blade in the design process is found out, and optimization design is facilitated.

Description

technical field [0001] The invention relates to the technical field of fluid machinery, in particular to a calibration method for fluid machinery. Background technique [0002] At present, the blade design of large flow pumps, water turbines, steam turbines, compressors, gas turbines, valves, etc. has always been one of the difficulties in the industrial field. Under the premise of satisfying performance, it is necessary to ensure the safety and reliability of the unit, especially the core working components--- The safety and reliability of the blade requires a new design of the blade. As the power of the unit is increasing and the efficiency requirements are getting higher and higher, higher requirements are placed on the blades. Fatigue fracture is the main failure mode of the blades, and the airflow bending stress is the core performance that must be satisfied when designing the fatigue reliability of the product. index. At present, most studies on the calculation of bl...

Claims

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Application Information

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IPC IPC(8): G06F30/17G06F30/23G06F30/28G06F113/08G06F119/02G06F119/14
CPCG06F30/17G06F30/23G06F30/28G06F2113/08G06F2119/02G06F2119/14Y02E10/72
Inventor 侯学金潘亦宁隋艺王军滕新伟何涛郭粉云
Owner ZHEJIANG PUMP GENERAL WORKS