底喷式等离子体发生器射流的输出特性

Plasma Jet Characteristics of Bottom Jet Plasma Generator

通过自行设计的可以综合评定等离子体射流速度、温度、压力分布等特性的实验装置,研究了底喷式等离子体射流特性。采用压电测量装置、光电测量装置和数字高速摄影研究了射流在一定距离上的压力分布特性、射流速度及射流形貌特征。结果表明,该发生器所产生等离子体射流随着距射流中心位置距离的增大迅速衰减,等离子体射流速度约500m/s,射流运动过程可分为两个阶段:第一阶段是电爆炸丝产生高温、高压等离子体射流;第二阶段是消融管消融所产生的射流。

An equipment of evaluating plasma jet characterisitcs, including velocity, temperature and pressure distribution was designed for understanding the plasma jet characteristic. The pressure distributing characteristic, velocity of plasma jet and plasma jet shape were determined with piezoelectric pressure measurement, photoelectric cell measurement and digital high speed camera. The results indicate that the pressure of plasma jet would attenuate rapidly with increasing of the distance to the center of plasma jet. The velocity of plasma jet is about 500 m/s under the condition of the test. The movement process of the plasma can be divided into two stages, the explodig fine copper wire produces high temperature and high pressure plasma jet after discharge at the first stage, and the melting capillary produces a jet at another stage.