Analysis of the enthalpy probe technique for thermal plasma diagnostics
Analysis of the enthalpy probe technique for thermal plasma diagnostics
复制标题
热等离子体诊断中的焓探针技术分析
DOI：
10.1063/1.1145517
复制
发表时间：
1995
影响因子：
1.6
通讯作者：
M. Boulos
中科院分区：
文献类型：
--
作者：
M. Rahmane;G. Soucy;M. Boulos
本文对热等离子体诊断中的焓探针技术进行了实验分析。重点是探头的灵敏度，它的准确性，以及它对等离子体流的影响。该研究是使用直流（dc）等离子体炬与Ar/H2混合物（1%H2）在两个不同的反应室压力，400和200 ℃下操作。结果表明，在探针针尖上涂覆热障涂层后，由于减少了探针表面的热流密度，从而提高了灵敏度。因此，即使在气体采样流率的低值下，探头仍然可以提供具有可接受的精度的测量，同时继续遵守等速采样条件。发射光谱结果表明，探针对等离子体射流温度场的影响可以忽略不计。
An experimental analysis of the enthalpy probe technique for thermal plasma diagnostics is presented. Emphasis is given to the probe sensitivity, its accuracy, and its effect on the plasma flow. The study was carried out using a direct current (dc) plasma torch operated with Ar/H2 mixture (1% H2) under two different reactor chamber pressures, 400 and 200 torr. The results show that when the probe tip is coated with a thermal barrier coating, the sensitivity is improved because of the reduction of the tare heat flux to the probe surface. Thus, even at low values of gas sampling flow rate, the probe can still provide measurements with acceptable accuracy while the isokinetic sampling condition continues to be respected. Emission spectroscopic results show that the probe has negligible effect on the temperature field of the plasma jet.