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采用红外摄象微机图象处理法对直流、高频脉冲微束等离子弧的温度场进行了测试;用激光显示技术观察了电弧与周围气流的形态;用微压测量器测量了电弧轴向压力。结果表明,高频电弧中心的轴向温度梯度低于直流电弧中心的轴向温度梯度。当脉冲频率大于10kHz时,随着脉冲频率的增加,高频电弧的直径逐渐缩小,小电流时尤为明显。高频电弧周围的气流具有与直流电弧周围气流相似的稳定性。高频电弧的最大轴向压力大于直流电弧。当脉冲频率大于10kHz时,脉冲频率增加,电弧最大轴向压力减小。
The temperature field of direct current, high frequency pulsed micro-beam plasma arc was tested by infrared camera computer image processing method. The laser arc was used to observe the shape of the arc and the ambient air flow. The micro-pressure measuring instrument was used to measure the arc axial pressure . The results show that the axial temperature gradient of high frequency arc center is lower than the axial temperature gradient of DC arc center. When the pulse frequency is greater than 10kHz, with the increase of pulse frequency, the diameter of high frequency arc is gradually reduced, especially when the current is small. The airflow around the high-frequency arc has similar stability to the airflow around the DC arc. The maximum axial pressure of high-frequency arc is greater than the DC arc. When the pulse frequency is greater than 10kHz, the pulse frequency increases, the maximum axial arc pressure decreases.