氩等离子体射流冲击平板壁面处电子温度的测量

本文对空气环境中氩等离子体射流冲击平板条件下冷壁附近的电子温度，采用静电探针方法进行了测量．研究了等离子体温度、速度以及平板至发生器出口距离等参数的影响．实验结果表明，在冷壁面附近，电子温度总是明显高于相应的重粒子温度，从而证明在等离子体射流冲击平板条件下冷壁附近的边界层显著偏离局域热力学平衡（ＬＴＥ）状态．实验结果还表明，探针污染是影响测量结果可靠性的一个重要因素．

MEASUREMENTS OF THE ELECTRON TEMPERATURE NEAR A FLAT PLATE IMPINGED BY AN ARGON PLASMA JET

Electron temperatures in the region near a water--cooling flat plate impinged by an argonplasma jet and located in the air ambience have been measured by using an electrostaticprobe. Different plasma temperatures and velocities as well as different distances from theplate surface to the exit section of the plasma torch are covered in the measurements. Themeasured data show that electron temperatures in the near--wan region of the plate are alwaysmuch higher than corresponding heavy--Particle temperatures. This fact demonstrates thatthe near--wall boundary layer is in the state of highly thermodynamic non-equilibrium. Theexperimental results also show that the surface contamination of the electrostatic probe isthe key factor which affects the measuring accuracy of the electron temperatures.