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通过构建等离子体数字测控系统,测量了等离子体发生器不同工况下的工作参数,包括工作气体流量、冷却水温升、弧电压与弧电流等。运用能量平衡原理,计算了等离子体发生器出口射流平均焓值、平均温度及其分布。结果表明,在等离子体发生器的出口处,射流温度呈抛物线分布,增加主气气体流量,射流焓值与温度呈下降趋势,而添加氢气为辅助工作气体时,射流焓值与温度将会得到显著提高。

The study of plasma jet characteristics

The operating parameters of plasma generator under various regimes were measured by a newly developed digital plasma measurement system,which can test the flowrate of working gas,temperature rise of cooling water,arc voltage and arc current.According to energy balance principle,plasma average enthalpy,plasma average temperature and its distribution at the plasma generator exit were calculated.The results show that at the plasma generator exit,the distribution of jet temperature is parabolic.Increasing gas flowrate,plasma jet enthalpy and temperature will decline,and while adding hydrogen as a supplementary gas,the enthalpy and temperature will increase significantly.