等离子体点火器设计及其放电特性研究

基于等离子体放电理论，设计了3种不同形式的等离子体点火器:环形等离子体点火器、碟形等离子体点火器和圆柱等离子体点火器。对于不同的等离子体点火器，研究了在电源激励形式、电压、气体压力变化时的点火器放电特性，并将等离子体点火器与普通火花塞点火器的点火进行了对比分析。结果表明:设计的3种等离子体点火器能够有效地产生等离子体放电流注；随着放电环境的空气气压的逐渐升高，等离子体点火器的临界放电电压不断增大；在低气压时，击穿阈值电压随气压增加呈线性上升，基本符合帕邢定律的放电公式，在高气压时 ，放电阈值电压会偏离帕邢定律。

Design of Plasma Igniter and Research on Discharge Characteristics

Based on the plasma discharge theory, three different forms of plasma igniters are designed, i.e. toroidal plasma igniter, disc and cylindrical plasma igniters. For different plasma igniters, the discharge characteristics of the igniters are investigated under the different forms of excitation power, voltage and gas pressure. The plasma igniters are compared with spark ignition. The results show that the plasma discharge stream can be produced by the plasma igniters. The discharge threshold voltage increases with the increasing air pressure. At low pressure, the discharge threshold voltage increases with the increasing pressure linearly, which is in accordance with the Paschen law. At high pressure, the discharge threshold voltage will deviate from the Paschen law.