Three-dimensional multi-field coupling simulation method for flow characteristics of multiple metal particles in GIS equipment

Abstract

The invention belongs to the field of insulation design and numerical simulation of high-voltage switch equipment, and particularly relates to a three-dimensional multi-field coupling simulation method for flow characteristics of multiple metal particles in GIS equipment. An Euler-Lagrange model and geometric modeling of particle flow under a coaxial cylindrical structure electric field are completed by writing open source codes of a CFDEM, and meanwhile numerical coupling of FVM and DEM algorithms is achieved. Calculation is completed on the basis of comprehensively considering a series of interactions of collision between particles, between particles and fluid, between particles and an electric field and between particles and an electrode and a shell and physical processes of charge and charge transfer when the particles collide with the electrode or between the particles, and characteristic parameters of particle flow characteristicssuch as the electric quantity, the speed, the displacement and the received acting force, are obtained. the dynamic distribution of multiple particles under two voltages of direct current and alternating current and the rolling state of the linear particles are finally observed through the post-treatment of the combination of the number and the shape, .

Description

technical field [0001] The invention relates to the technical field of insulation design and numerical simulation of high-voltage switchgear, in particular to a three-dimensional multi-field coupling simulation method for the flow characteristics of multi-metal particles inside GIS equipment. Background technique [0002] The movement of charged particles is generally considered to be one of the dangerous behaviors that threaten the insulation of gas-insulated switchgear (GIS) equipment. However, there are very few studies on the simulation or numerical calculation of particle motion behavior, and the theoretical derivation of the force analysis of charged particles is not perfect. The main reasons are the following three aspects: First, the physical modeling of particle motion is complex , the shape of the particle itself, the material properties, the external environment and other natural factors vary widely. Various random collision behaviors occur during the particle mot...

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Problems solved by technology

However, there are very few studies on the simulation or numerical calculation of particle motion behavior, and the theoretical derivation of the force analysis of charged particles is not perfect. The main reasons are the following three aspects: First, the physical modeling of particle motion is complex , the shape of the particle itself, the material properties, the external environment and other natural factors vary widely. Various random collision behaviors occur during the particle motion, causing the particle to rotate, so that the particle is affected by the Magnus force. At this time, the particle that originally moved in a straight line Due to the influence of the Magnus force, the trajectory shifts or even becomes an arc. For charged particles, the charge transfer phenomenon will also occur when a collision occurs; second, even if the various forces are fully considered, the boundaries of various walls Conditional particle motion model, because this problem involves the coupling solution of continuous phase (fluid and electric field) and discrete phase (particle), while the traditional FEM (finite element), FVM (finite volume) method has no advantage in solving the discrete phase model, so it is necessary to find a new and suitable algorithm; third, establish a complete boundary condition and particle model at the same time, and then consider the effects of all forces, such Calculation amount of calculation example will be very complex

The traditional Euler method (such as FEM) is usually difficult to realize the above process, and it is also difficult to intuitively and vividly describe the flow details of such discrete particles

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