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Charge exchange collision MCC method used for ion thruster numerical simulation

An ion thruster and charge exchange technology, applied in instruments, geometric CAD, electrical and digital data processing, etc., can solve the problems of time-consuming and low-efficiency calculation, and achieve the effect of saving calculation time and improving calculation efficiency.

Active Publication Date: 2018-09-18
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0009] In view of the above existing problems or deficiencies, in order to solve the problems of low efficiency and time-consuming calculation in the application of the MCC method in the numerical simulation of ion thruster charge exchange collision, the present invention utilizes the hardware architecture characteristics of the graphics processor GPU to provide a Charge Exchange Collision MCC Method for Numerical Simulation of Ion Thrusters

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  • Charge exchange collision MCC method used for ion thruster numerical simulation
  • Charge exchange collision MCC method used for ion thruster numerical simulation
  • Charge exchange collision MCC method used for ion thruster numerical simulation

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with accompanying drawings and examples.

[0025] In the example, a two-dimensional axisymmetric plume model was tested, using xenon gas as the example of an ion thruster as the propellant. Its cross-sectional diagram is shown in Figure 4 As shown, the charge exchange collision of the ion thruster is simulated in the way of 2D3V. The number of simulated xenon ions is 1 million, and the initial velocity of xenon ions is υ bi , the initial positions of xenon ions are evenly distributed at the gate exit, and the collision cross section of charge exchange collision between xenon ions and xenon atoms is expressed as:

[0026] σ cex =(k 1 lnυ bi +k 2 ) 2 ×10 -20 m 2 (1)

[0027] For xenon ions, the constant coefficient k in the formula 1 =-0.8821,k 2 = 15.1262.

[0028] The probability of a charge exchange collision occurring is expressed as:

[0029] P=1-exp(-n 0 σ cex υ bi Δt) ...

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Abstract

The invention relates to the field of ion thruster numerical simulation, in particular to a charge exchange collision MCC method used for ion thruster numerical simulation. By utilizing a physical characteristic of charge exchange collision of an ion thruster, and in combination with a single-instruction multi-thread characteristic of a graphic processing unit (GPU) in the field of computers, parallel execution of single instruction multiple data of a charge exchange collision MCC algorithm for the ion thruster is realized, so that the calculation efficiency is greatly improved and the calculation time is shortened.

Description

technical field [0001] The invention relates to the field of ion thruster numerical simulation, in particular to a charge exchange collision MCC method for ion thruster numerical simulation. Background technique [0002] Electric propulsion is a technology that uses electric energy to ionize propellants to generate high jet velocity to achieve thrust. The specific impulse of electric propulsion is higher than that of traditional chemical propulsion technology, which is 10 times or more than that of traditional propulsion systems, so it can greatly reduce the amount of propellant carried by spacecraft, thereby significantly increasing the payload of spacecraft. Generally, electric propulsion devices are divided into three types: electrostatic, electrothermal and electromagnetic. The ion thruster is a kind of electrostatic thruster. Compared with other thrusters, the biggest advantage of ion thrusters is that the specific impulse and efficiency are higher than other thrusters...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/15
Inventor 金晓林叶晓辉李斌杨中海
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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