Analogy method of water-gas coupling transient flow in pipeline
An analog method, a gas-coupled technology, applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve problems such as tedious interpolation and complex interpolation.
Active Publication Date: 2016-04-06
HOHAI UNIV
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[0006] Purpose: In order to make up for the shortcomings of the existing elastic water body model, such as complex interpolation, the present invention provides a simulation method for water-air coupling transient flow in pipelines, based on the finite volume method, the algorithm is simple, easy to implement, and the convection item can be fully considered , tail water and other factors, and avoid cumbersome interpolation and other problems
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[0048] The present invention will be further described below in conjunction with specific examples.
[0049] Such as figure 1 As shown, a simulation method of water-air coupled transient flow in pipeline based on finite volume method is carried out as follows: the transient flow in the pipeline system is divided into three major categories: water body, water-gas interface, and trapped air mass. Part, and establish the corresponding governing equations, determine the initial conditions and boundary conditions according to engineering examples; divide the calculation grid according to the finite volume method, and establish the discrete equation; use the Godunov scheme to solve the numerical flux of the discrete equation of the water body, and obtain the second order Accuracy; by solving the numerical integral term of the discrete equation of the water body based on the Runge-Kutta method, the Godunov scheme of the second-order explicit finite volume method is obtained; the CFL ...
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The invention discloses an analogy method of water-gas coupling transient flow in a pipeline on the basis of a finite volume method, and considers the influence of the convective term and the tailwater depth of an impact water body in a water-gas coupling function process. Firstly, a computational domain is divided into three parts including the impact water body, a water-gas interface and a retention air mass. Firstly, the water body computational domain is firstly dispersed into a computation grid unit by aiming at a water body part, a discrete format of a transient flow basic differential equation is established, and then, a Godunov format is adopted to solve the numerical flux of a water body unit control volume. A Runge-Kutta method is adopted to solve the numerical value integral term of a water body discrete equation. A Godunov format and an ideal gas state equation are simultaneous to realize the dynamic tracking of a water-gas interface. A slope restrictor is introduced to restrict false numerical value oscillation so as to realize two-order precision simulation. The water-gas coupling function hydraulic phenomenon of a stream impact trapped air mass in a water pipeline system can be subjected to strict and accurate numerical value analogy and transient analysis.
Description
technical field [0001] The invention relates to a simulating method of water-gas coupling transient flow in a pipeline based on a finite volume method, and belongs to the technical field of hydraulic numerical calculation of a hydropower station (pumping station). Background technique [0002] In actual water pipeline systems such as hydropower stations and pumping stations, air masses may often remain in the raised sections, closed ends, and vented maintenance sections along the lines, and water- The complex hydraulic transient phenomenon of gas coupling, and its corresponding abnormal water hammer (or: gas-water hammer) may be large enough to cause pipeline explosion. 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 is full of water, and do not consider the existence and harm of trap...
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Login to View More IPC IPC(8): G06F17/50
CPCG06F30/367G06F2113/14
Inventor周领王欢马佳杰潘天文刘德有王沛夏林
OwnerHOHAI UNIV