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A fluid mechanical calibration method

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

Active Publication Date: 2021-11-23
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

[0180] According to a particular embodiment of the invention, the fluid domain calculation method of the present invention will be described in detail below.

[0181] Import the fluid domain grid into the fluid dynamics computing software for fluid domain calculation to obtain a pneumatic parameters of the fluid domain; where the rotor turns a rotor to a plurality of discrete time steps;

[0182] The fluid domain calculation includes the steps of:

[0183] The total pressure value and the total temperature value of the device inlet are preset in the software;

[0184] The static value of the device outlet is preset in the software;

[0185] Set the work quality as water or gas;

[0186] The speed of different working conditions is given, the speed range is 30% to 120% of the design conditions;

[0187] Turbulent model selection RNGκ-ε model;

[0188] The pneumatic parameters of the fluid domain are obtained by three-dimensional compuble non-normal calculation methods, and the pneu...

Embodiment 2

[0213] According to a specific embodiment of the invention, the solid domain calculation method of the present invention will be described in detail below.

[0214] Import solid domain grid into solid mechanics computing software for solid domain calculations, give different operating speeds, resulting in the deposition of the blade to withstand the centrifugal prestress,

[0215] Solid domain calculations include the following steps:

[0216] Set the shaft portion to a fixed type;

[0217] Set the working speed;

[0218] The implicit dynamic analysis method is used, and the finite element discrete method is used to control the approach to calculate the blade to withstand the centrifugal prestress distribution.

[0219] The calculation blade is subjected to centrifugal prestressing distribution comprises the steps of:

[0220] According to the geometric physical three-dimensional model of the blade and the density of the blade material, the blade is obtained;

[0221] According to...

Embodiment 3

[0229] According to a particular embodiment of the invention, the calculation method of the blades of the present invention in which the airflow alternating stress distribution in the prestressed state will be described in detail.

[0230] The amplitude distribution field of pulsating flow field corresponding to each blade surface k-stage k (x, y, z) and phase distribution field And the blade is subjected to centrifugal prestress distribution, and the airflow alternating stress distribution of blades in the prestressed state is obtained, which includes the following steps:

[0231] S7100: Pneumatic load P in the form of the amplitude phase of each node obtained in S500 k (x, y, z) and Write into the form of real and virtual parts;

[0232] S7200: According to the vane calculated in S600, the centrifugal prestressed distribution is performed, and the surface pressure of the fluid domain is mapped to the solid domain surface, and the steady state response of the blade structure is...

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Abstract

The invention provides a fluid machinery calibration method and system, belonging to the technical field of fluid machinery. The present invention establishes a solid domain model and a fluid domain model according to the parameters of the designed equipment, and performs grid division, uses three-dimensional unsteady analysis on the fluid domain to obtain the unsteady aerodynamic load on the surface of the blade, and then obtains the surface pressure of each point. The surface pressure of the fluid domain is mapped to the surface of the solid domain through the node coordinates, and then the steady-state response of the blade structure is obtained. The solid domain adopts the implicit dynamic analysis method to calculate the centrifugal prestress distribution of the blade, and then obtain the airflow bending stress at each point of the blade. The method can reflect the transient three-dimensional stress situation of the blade of the power component in real time, and adopts the fatigue evaluation method of the Goodman diagram as the check criterion, which can accurately judge the fatigue life of the blade in the design stage of the blade, and find out the weak link of the blade in the design process. Helps to optimize the design.

Description

Technical field [0001] The present invention relates to the field of fluid mechanical technology, and more particularly to a fluid mechanical examination method. Background technique [0002] At present, the blade design of large flow pumps, turbines, steam turbines, compressors, gas turbines, and valves is one of the difficulties in the industrial sector. Under the premise of meeting performance, ensure that the unit is safe and reliable, especially the core doing power parts --- The blade is safe and reliable, and the blade needs to be newly designed. Since the power of the unit is getting bigger and higher, the efficiency requirement is getting higher and higher, and the blade has put forward higher requirements, fatigue breaks are the main failure of the blade, and the gas flow bending force is the core performance that must be satisfied when product design fatigue reliability. index. At present, most of the calculation of the discharge stress of the leaves is used in convent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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