水中放电等离子体特性的理论研究

水中放电等离子体(PPDW)具有高压、高密度和低温、低电离度的特点，人们对其辐射是否具有黑体辐射的特点一直观点不一．本计算了当通道压力为10^6pa、10^8Pa、10^9Pa，温度从3000K到60000K时PPDW的弹性、非弹性碰撞特征时间及辐射平均自由程．计算结果表明，当通道压力为10^6Pa时，通道辐射在所计算的温度范围内不能看作黑体辐射．当通道压力为10^8Pa时，通道辐射在温度从16000K到35000K范围内可看作黑体辐射．通道压力达10^9pa时，通道辐射在12000K以上均可看作黑体辐射．中还对通道电导率与其自身磁场的关系作了数值分析，结果表明只有在很低的温度和通道压力情况下才必须考虑自身磁场的影响，通常可不考虑其影响．

Theory of Plasma Character in a Pulsed ischarge in Water

Plasma in a pulsed discharge in water (PPDW) has the character of high pressure, high density and low temperature, low ionized degree. Whether its radiation is blackbody radiation, there is no agreement. This paper computes the radiation free path and the characteristic time of elastic collision and inelastic collision, when the channel pressure is given and channel temperature changes from 3000K to 60000K. The result indicates that PPDW radiation is not blackbody radiation when channel pressure is 10 6Pa. But its radiation can be regard as blackbody radiation when channel pressure is 108Pa and temperature changes from 16000K to 35000K. And while channel pressure is 10 9Pa, its radiation is blackbody radiation only if channel temperature is higher than 12000K. The channel conductance is affected by channel self magnetic obviously only when the channel temperature and channel pressure are very low. At most condition, it can be neglected.