Liquid column separation-bridged water hammer simulation method based on three-dimensional CFD (Computational Fluid Dynamics)

A liquid column separation and simulation method technology, applied in the field of hydraulic numerical simulation of hydropower stations, can solve the problems of complex hydraulic transition process, difficult to simulate one-dimensional model, unable to effectively simulate cavity shape and position change, etc., to simplify the solution. method to ensure high computational efficiency

Active Publication Date: 2016-02-03
HOHAI UNIV +1
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Problems solved by technology

The existing one-dimensional model cannot effectively simulate the shape and position of the cavity during the liquid column separation process
In particular, the liquid column separation phenomenon in the draft tube of the hydropower station and the pumped storage power station will have a more complicated

Method used

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  • Liquid column separation-bridged water hammer simulation method based on three-dimensional CFD (Computational Fluid Dynamics)
  • Liquid column separation-bridged water hammer simulation method based on three-dimensional CFD (Computational Fluid Dynamics)
  • Liquid column separation-bridged water hammer simulation method based on three-dimensional CFD (Computational Fluid Dynamics)

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Embodiment Construction

[0036] 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 the present application.

[0037] Embodiment: in order to verify and analyze the simulated effect of the CFD-based liquid column separation-bridging water hammer simulation method provided by the present invention, the liquid column separation-bridging water hammer experimental device system designed and built by Simpson in 1986 is used to verify this The effectiveness of the inventive method, its simplified schematic diagram of the experimental device is shown in figure 1 . The system consists of upstream pressure water t...

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Abstract

The invention discloses a liquid column separation-bridged water hammer simulation method based on three-dimensional CFD (Computational Fluid Dynamics). The liquid column separation-bridged water hammer simulation method comprises the following steps: by carrying out three-dimensional modeling and mesh generation, firstly, carrying out single-phase compressible stable-state calculation of a water body to obtain a stable-state fluid field; then carrying out liquid column separation gas-liquid two-phase transient flowing calculation; and finally, processing a computed result by using post-processing software. According to the liquid column separation-bridged water hammer simulation method, on the basis of simultaneously considering the compressibility of the water body and steam, the mass transfer between gas and liquid is considered, and liquid column separation types do not need to be distinguished, so that a mathematical model and a solving method thereof are simplified to a certain extent and the simulation accuracy is relatively high; and unreal pressure pulse similar with one-dimensional simulation is not formed, and visualization of primary formation, development and collapsing processes of a hollow hole in a liquid column separation process is realized.

Description

technical field [0001] The invention relates to a three-dimensional simulation method when liquid column separation-bridging water hammer gas-liquid two-phase transient flow occurs in a water delivery overcurrent system, and belongs to the technical field of hydraulic numerical simulation of hydropower stations (pump stations). Background technique [0002] In the water delivery overcurrent system, the sudden load shedding of the hydropower unit, the start and stop of the water pump unit, the shutdown of the accident condition, and the sudden action of the regulating valve can all cause rapid changes in flow and pressure. When the pressure drops below the vaporization pressure, the liquid vaporizes to form cavitation bubbles. Cavitation bubbles flow with the liquid, and may even develop and accumulate to occupy the entire cross-section of the flow, breaking the liquid column and causing liquid column separation. When the pressure in the tube rises, the cavity collapses, and...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06T17/00
Inventor 周领王欢马佳杰刘德有王沛夏林潘天文
Owner HOHAI UNIV
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