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CFD (computational fluid dynamics) based method for computing equivalent length of valve

A calculation method and equivalent technology, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problems of long development cycle, high development cost, low efficiency, etc., achieve the effects of stable calculation, improved measurement accuracy, and simplified analysis process

Active Publication Date: 2014-04-16
NEWAY VALVE SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For this reason, the present invention solves the problem of long development period and high development cost caused by the low efficiency of using the test method to calculate the equivalent length of the valve in the prior art, thereby proposing a method for calculating the equivalent length of the valve based on CFD. The analog calculation method calculates the equivalent length of the valve to improve development efficiency and save costs

Method used

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  • CFD (computational fluid dynamics) based method for computing equivalent length of valve
  • CFD (computational fluid dynamics) based method for computing equivalent length of valve
  • CFD (computational fluid dynamics) based method for computing equivalent length of valve

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Embodiment 1

[0040] A kind of valve equivalent length calculation method based on CFD described in the present invention, such as figure 1 Shown, comprise the following steps: set up the three-dimensional assembly model of valve, this method preferably adopts three-dimensional software SolidWorks to set up the three-dimensional assembly model of valve, as figure 2It is a three-dimensional assembly model of a valve in a specific embodiment; in order to simplify the analysis and calculation process, on the premise of not affecting the analysis results, the components that do not affect the generation of the flow channel and are not in direct contact with the fluid medium, and the small parts that do not affect the calculation results are removed. Components, only create a 3D model of the flow channel closure. At the same time, in order to fully develop the fluid medium, the measuring point can reach a stable state, and make the calculation stable, it is necessary to add an extension section...

Embodiment 2

[0046] On the basis of a CFD-based valve equivalent length calculation method described in Example 1, when setting volume flow boundary conditions, ensure that the inlet flow velocity is within a reasonable speed range of 3-8m / s, and at the same time ensure that complete turbulent flow is generated , the minimum Reynolds number is not less than 4×10 4 , the outlet pressure is set to 0; for a globe valve with a nominal diameter of DN25, when the volume flow boundary condition is set, the corresponding inlet volume flow value is selected from 4-12m3 / h and 5 values ​​are selected to obtain five working conditions:

[0047] Calculation working condition 1: set the volume flow Q1=4m3 / h at the inlet surface; set the pressure P=0 at the outlet surface;

[0048] Calculation working condition 2: set the volume flow Q2=6m3 / h at the inlet surface; set the pressure P=0 at the outlet surface;

[0049] Calculation working condition 3: set the volume flow Q3=8m3 / h at the inlet surface; set ...

Embodiment 3

[0065] In the above embodiments, the valve equivalent length calculation method based on CFD is realized. In the initial stage of valve design, it is in the virtual prototype stage. After calculating the equivalent length, it is necessary to further judge whether the equivalent length meets the requirements. If it meets the requirements, Then develop and produce according to the previous design. If the requirements are not met, the flow channel structure needs to be optimized. The specific implementation method is: compare the calculated equivalent length value with the limit value of the technical requirements. According to the relevant technical requirements, the limit value here is limited according to different valve types, such as the limit value requirements of globe valves and check valves. is 340, and the equivalent length of the cut-off valve with diameter DN25 in the above-mentioned embodiment 2 is calculated as 275, which is significantly smaller than the limit value...

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Abstract

The invention relates to a CFD (computational fluid dynamics) based method for computing equivalent length of a valve. The method includes the steps: establishing a three-dimensional assembly model of the valve, after an extension section is added to an entry and exit position of the valve model, importing the model into CFD software, working out pressure values of multiple working conditions by analog calculation of the CFD software and computing corresponding pressure differences; according to the pressure differences, respectively computing multiple flow coefficient values through a formula, and then computing an average flow coefficient value; computing an equivalent length value of the valve through a formula. Flow performance data of the valve are obtained by the aid of CFD technological analogue simulation, only drawings are needed to be used for completion in a virtual prototype phase in the initial stage of development, and the situations that manpower and material resources are wasted and development cycle is prolonged due to the fact that the valve must be manufactured and subjected to test measurement in order to detect flow performance of the valve in the prior art are avoided, so that development efficiency is greatly improved and cost is saved by the method.

Description

technical field [0001] The invention relates to a method for calculating the flow capacity of a valve, in particular to a method for calculating the equivalent length of a valve based on CFD. Background technique [0002] The equivalent length (L / D) of the valve is an important parameter to measure the flow capacity of the valve. It is used to characterize the pressure loss when the fluid passes through the valve. The smaller the value, the smaller the pressure loss of the fluid through the valve, and the greater the flow capacity of the valve. it is good. [0003] But at present, the calculation of the equivalent length (L / D) of the valve mainly uses the flow resistance test method, as disclosed in the Chinese patent document CN103076048A, a method for measuring the flow rate of the valve, including the following steps: A. Measuring the flow coefficient: measuring the valve at Record the flow coefficient at each opening degree; B. Measure the pressure difference: measure t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 陈天敏魏宏璞姚青吴敬普王龙骧高开科
Owner NEWAY VALVE SUZHOU
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