Trapped air mass thermodynamic characteristic simulation method based on three-dimensional CFD

A simulation method and thermodynamic technology, applied in 3D modeling, geometric CAD, special data processing applications, etc., can solve the problems of no temperature records, difficult to accurately measure the position and volume of air masses, etc.

Active Publication Date: 2017-06-13
HOHAI UNIV
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Problems solved by technology

For the air mass volume at any time, because the water-air interface is free to change, the high degree of air-water mixing makes it difficult to accurately measure the position and volume of the air mass
In addition,

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  • Trapped air mass thermodynamic characteristic simulation method based on three-dimensional CFD
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  • Trapped air mass thermodynamic characteristic simulation method based on three-dimensional CFD

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Embodiment Construction

[0043] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of this application.

[0044]Embodiment: In order to verify and analyze the simulation effect of the simulation method based on the CFD-based thermodynamic characteristics of the trapped air mass provided by the present invention, the water two-phase flow experimental device system designed and built by this research group in 2011 is selected for validating the method of the present invention The schematic diagram of its simplified experimental setup is shown in figure 1 . The system is mainly composed of pressure tank, steel...

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Abstract

The invention discloses a method for simulating trapped air mass thermodynamic characteristic in the pipeline rapid water filling process on the basis of computational fluid dynamics (CFD). Firstly, three-dimensional modeling and mesh generation are conducted, and a volume of fluid (VOF) method is adopted for conducting gas and water two-phase transient flow calculation; finally, post-processing software is used for processing a calculated result. According to the method, on the basis that the compressibility of water and the compressibility of gas are considered at the same time, the heat conduction among water, gas and a solid wall surface and the convective heat transferring effect are considered, energy dissipation in the rapid water filling process can be more accurately simulated, and then the gas-water coupling effect and the air mass thermodynamic characteristic in the process are more deeply studied.

Description

technical field [0001] The invention relates to a three-dimensional simulation method for air mass thermodynamic characteristics when water flow impacts and retains air mass in a water delivery overcurrent system, and belongs to the technical field of hydraulic numerical simulation of hydropower stations (pumping stations). Background technique [0002] In actual water pipeline systems such as hydropower stations and pumping stations, air masses may be trapped in the raised sections, closed ends, and vented maintenance sections along the lines. The hydraulic transients caused by expansion deformation, fission and collapse will cause pressure fluctuations and vibrations in the pipeline system, and even cause damage to the pipeline system. Most of the destruction accidents in the actual water delivery system are related to the transient flow with trapped air mass. However, so far, the design standards of the actual pipeline system only consider the situation that the pipeline...

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Application Information

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IPC IPC(8): G06F17/50G06T17/00
CPCG06F30/17G06F2113/14G06F2119/06G06T17/00
Inventor 周领王欢潘天文马佳杰刘德有王沛
Owner HOHAI UNIV
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