基于ANSYS的空气电弧放电等离子体温度数值模拟

Numerical simulation of arc plasma temperature based on ANSYS

吸入一氧化氮(NO)疗法因其具有疗效快、非创伤性及高选择性等优点,在临床救治新生儿急性肺损伤和持续肺动脉高压等相关疾病方面逐步得到广泛应用。电弧放电是产生NO的一种新方法。因此,研究控制空气电弧放电合成NO的等离子体参数,对实现电弧放电合成医用NO在临床上的应用具有重要意义。本文根据磁流体动力学理论,建立了脉冲电弧放电等离子体轴对称数学模型,运用ANSYS软件,对电弧放电等离子体温度场分布和电流密度进行了数值模拟。结果表明,当电流增大时,阳极附近温度增大,阳极电流密度增大;当弧长增加时,阳极附近温度增大,阳极表面电流密度增大,阴极电流密度略变小。温度的升高,有利于NO的合成及抑制NO2的生成。

Inhaled NO has good curative effect,non-traumatic and high selectivity,and is gradually widely used in clinical treatment of neonatal with acute lung injury and persistent pulmonary hypertension. Arc discharge is a new method of producing NO. So research on control of plasma parameters is of great significance in the clinical application of NO generated by arc discharge. Based on the theory of magnetic fluid dynamics,this paper established an axial symmetry mathematical model of pulsed arc plasma,and simulated the plasma temperature distribution and current density of arc-discharge by using ANSYS. The results show that,when the current increases,temperature near the anode and anode current density increase; when the arc length increases,temperature near the anode and anode current density increase,and cathode current density decreases slightly. The increase on temperature is beneficial to the formation of NO but goes against the generation of NO2.