CN-121980981-A - Multi-physical-field coupling method, system, equipment and medium for ion wind flow field

CN121980981ACN 121980981 ACN121980981 ACN 121980981ACN-121980981-A

Abstract

The invention discloses a multi-physical field coupling method, a system, equipment and a medium of an ion wind field, which comprise the steps of obtaining a multi-physical field model with initial boundary setting by setting boundary conditions comprising space charge density initial values for electrostatic fields, charge fields and air flow fields, obtaining a bidirectional coupling system for realizing the electric fields, the charge fields and the flow fields by introducing a current physical force determined by the charge density and the electric field strength into a Navier-Stokes equation as a source item and establishing a feedback relation between the charge convection and the flow field speed, and obtaining an ion wind field result by carrying out numerical solution and carrying out iterative verification on the surface electric field strength of a corona electrode according to a Pek formula and a Carpezoff assumption. The invention obviously improves the physical reality, the calculation stability and the engineering applicability of the simulation of the ion wind flow field.

Inventors

WU YU
ZHENG SHUYI
Nie Xianglun
YIN FANGHUI
LIAO YONGLI
XIE TAO
ZHOU WENXUAN
ZHOU LIN
LI YI
ZHENG XIAOHU
LIU QING

Assignees

贵州电网有限责任公司

Dates

Publication Date: 20260505
Application Date: 20251201

Claims (10)

1. An ion wind flow field multi-physical field coupling method is characterized by comprising the following steps: Acquiring voltage, corona onset voltage and geometric parameters of a corona electrode, calculating corona current according to a difference value of the voltage and the corona onset voltage, and determining initial estimation of space charge distribution by combining corona onset field intensity and electrode length to obtain a space charge density initial value; based on the space charge density initial value, a multi-physical field model with initial boundary setting is obtained by setting boundary conditions comprising the space charge density initial value for an electrostatic field, a charge field and an air flow field; Based on a multi-physical field model, a current force determined by charge density and electric field strength is used as a source term to be introduced into a Naviet-Stokes equation, and a feedback relation between charge convection and flow field speed is established, so that a bidirectional coupling system for realizing electric field, charge field and flow field is obtained; based on a bidirectional coupling system, an ionic wind flow field result is obtained by carrying out numerical solution and carrying out iterative verification on the surface electric field intensity of the corona electrode according to a Peak formula and a Carpezoff hypothesis.
2. The method for coupling multiple physical fields of an ion wind field of claim 1, wherein the obtaining initial values of space charge density comprises: Based on the curvature radius, the surface state and the environmental condition of the corona electrode, determining the corona onset field intensity required by corona discharge by utilizing a Peak formula; calculating corona onset voltage according to the corona onset field intensity, the curvature radius of the corona electrode and the distance between the corona electrode and the counter electrode; And estimating corona current based on the difference value of the actually applied corona electrode voltage and the corona onset voltage, and deducing a space charge density initial value by combining the corona onset field intensity, the corona current and the effective discharge length of the corona electrode.
3. The method for coupling multiple physical fields of an ion wind field according to claim 1 or 2, wherein the obtaining the multiple physical fields model with initial boundary setting comprises: inputting the initial value of the space charge density as the boundary of a charge field on the surface of a corona electrode; Setting a zero potential boundary condition at the grounding electrode based on the charge field boundary and the voltage configuration of the corona electrode and the grounding electrode, and constructing an electrostatic field solving domain containing space charge influence; and determining the range of a flow field calculation domain according to the action area of the electrostatic field and the charge field, setting a speed boundary condition and a pressure boundary condition matched with the actual airflow environment at the outer boundary of the flow field calculation domain, and completing the cooperative initial boundary configuration of the three physical fields.
4. The method for coupling multiple physical fields of an ion wind field according to claim 3, wherein said obtaining a bidirectional coupling system between an electric field, a charge field and a flow field comprises: expressing the electrofluid force as the product of the charge density and the electric field strength, and adding the product as a momentum source term into a Navie-Stokes equation; introducing flow field speed as a convection term in a charge transport equation; And solving an electrostatic field equation according to the updated charge distribution to obtain electric field distribution, and calculating the current force in the next iteration based on the electric field distribution and the corresponding charge density to form an iterative coupling loop among the electric field, the charge field and the flow field.
5. The method for coupling multiple physical fields of an ion wind field of claim 4, wherein said obtaining an ion wind field result comprises: extracting the average electric field intensity of the surface of the corona electrode after each numerical solution; judging whether the deviation of the average electric field strength and the corona onset field strength exceeds a preset threshold value according to a carpzoff hypothesis, wherein the corona onset field strength is predetermined by a Peak formula; if the average electric field intensity is larger than the corona onset field intensity, increasing a space charge density initial value, if the average electric field intensity is smaller than the corona onset field intensity, reducing the space charge density initial value, and re-executing multi-physical field coupling solution based on the adjusted space charge density initial value; And when the deviation does not exceed the preset threshold value, determining the air flow field obtained by current solving as an ion wind flow field result.
6. The method of claim 5, wherein the corona electrode is a needle electrode, and the counter electrode is one of a planar electrode and a mesh electrode; The corona onset voltage is determined by the corona onset field intensity, the radius of curvature of the corona electrode and the electrode spacing based on an electric field distribution model of the needle-plane symmetric electrode; the corona current is estimated by adopting an exponential nonlinear empirical relationship according to the difference value between the actual applied voltage and the corona onset voltage.
7. The method of claim 6, wherein at least one of the following modeling operations is performed in constructing the bi-directional coupling system: when solving the Navier-Stokes equation, an incompressible fluid model is adopted, and the influence of density change on the momentum equation is ignored; In the charge transport equation, the ion mobility is set to a constant independent of the electric field strength and temperature; In the coupling solving process, the Joule heat caused by space charge is not calculated, and the gas temperature is regarded as constant; in charge field modeling, only space charges of a single polarity are introduced, and the generation and recombination processes of anisotropic charges are ignored.
8. An ionic wind field multi-physical field coupling system employing the method of any of claims 1-7, comprising: The space charge initial value estimation module is used for acquiring the voltage, the corona onset voltage and the geometric parameters of the corona electrode, calculating corona current according to the difference value of the voltage and the corona onset voltage, and determining initial estimation of space charge distribution by combining the corona onset field intensity and the electrode length to obtain a space charge density initial value; The multi-physical field initial boundary configuration module is used for obtaining a multi-physical field model with initial boundary setting by setting boundary conditions comprising space charge density initial values for an electrostatic field, a charge field and an air flow field based on the space charge density initial values; The bidirectional coupling modeling module is used for obtaining a bidirectional coupling system for realizing an electric field, an electric field and a flow field based on a multi-physical field model by taking an electric fluid force determined by the electric charge density and the electric field strength as a source term to introduce a Navier-Stokes equation and establishing a feedback relation between the electric charge convection and the flow field speed; and the physical constraint iteration verification module is used for carrying out numerical solution based on a bidirectional coupling system, and carrying out iteration verification on the electric field intensity of the corona electrode surface according to a Peak formula and a Carpezoff assumption to obtain an ion wind flow field result.
9. An electronic device, comprising: a memory for storing a program; a processor for loading the program to perform the steps of the method according to any one of claims 1-7.
10. A computer readable storage medium storing a program, which when executed by a processor, implements the steps of the method according to any one of claims 1-7.

Description

Multi-physical-field coupling method, system, equipment and medium for ion wind flow field Technical Field The invention relates to the technical field of corona discharge analysis, in particular to a multi-physical-field coupling method, a system, equipment and a medium for an ion wind flow field. Background Corona discharge is a common gas discharge phenomenon that can be frequently achieved in high-voltage electrical equipment, electrostatic precipitator devices, ion blowers, and laboratories. When a strong electric field is applied to the upper head of the gas, gas molecules are ionized, the generated charged particles start to run in an accelerating way under the pushing of the electric field force, and collide with neutral gas molecules while running, so that a macroscopic airflow is formed, and the macroscopic airflow is called as ion wind. This wind not only changes the local flow field structure, but also adversely affects how the charges are distributed in space and what the electric field is, and as a result, a particularly complex set of "charge-flow" multi-physical field mutual coupling effects is achieved. When the ion wind flow field simulation is performed at present, people often adopt a unidirectional coupling method, or do some simplifying assumptions, such as directly neglecting the feedback effect of a flow field on charge transport, or do static solution by using a fixed space charge boundary condition. The method is difficult to truly restore the dynamic interaction between the electric field, the electric charge and the flow field which you come and go in the corona discharge process, so that the calculated result has small deviation from the actual physical process. Moreover, the existing model often lacks a self-consistent verification mechanism for corona initial conditions, and cannot guarantee that the calculated electric field strength truly accords with the basic physical rule of gas discharge, such as Peek corona starting criterion or Kaptzov assumption, so that the speed and direction of ion wind and the prediction accuracy of spatial distribution are also compromised. Disclosure of Invention The present invention has been made in view of the above-described problems occurring in the prior art. Therefore, the invention provides a multi-physical field coupling method, a system, equipment and a medium for an ion wind field, which solve the problem that the existing simulation method is difficult to accurately couple an electric field, a charge field and a flow field. In order to solve the technical problems, the invention provides the following technical scheme: in a first aspect, the present invention provides a method for coupling multiple physical fields of an ion wind flow field, including: Acquiring voltage, corona onset voltage and geometric parameters of a corona electrode, calculating corona current according to a difference value of the voltage and the corona onset voltage, and determining initial estimation of space charge distribution by combining corona onset field intensity and electrode length to obtain a space charge density initial value; based on the space charge density initial value, a multi-physical field model with initial boundary setting is obtained by setting boundary conditions comprising the space charge density initial value for an electrostatic field, a charge field and an air flow field; Based on a multi-physical field model, a current force determined by charge density and electric field strength is used as a source term to be introduced into a Naviet-Stokes equation, and a feedback relation between charge convection and flow field speed is established, so that a bidirectional coupling system for realizing electric field, charge field and flow field is obtained; based on a bidirectional coupling system, an ionic wind flow field result is obtained by carrying out numerical solution and carrying out iterative verification on the surface electric field intensity of the corona electrode according to a Peak formula and a Carpezoff hypothesis. As a preferable scheme of the ion wind flow field multi-physical field coupling method, the method comprises the steps of: Based on the curvature radius, the surface state and the environmental condition of the corona electrode, determining the corona onset field intensity required by corona discharge by utilizing a Peak formula; calculating corona onset voltage according to the corona onset field intensity, the curvature radius of the corona electrode and the distance between the corona electrode and the counter electrode; And estimating corona current based on the difference value of the actually applied corona electrode voltage and the corona onset voltage, and deducing a space charge density initial value by combining the corona onset field intensity, the corona current and the effective discharge length of the corona electrode. As a preferable scheme of the ion wind flow field multi-physical field coupling me