It was found that the gas temperatures at arcroot and arc tip are equal and they decrease with the argon flow rate increasing.
实验发现弧根和弧梢处的气体温度相等，并随着气体流量的增大而下降。
2
With gas flow rate increasing, the vibrational temperature at both tip and root decreases, but the decreasing rate at arc tip is faster than that at arcroot.
随着气体流量的增大，弧梢处与弧根处的振动温度均下降，但弧梢处下降速率较快。
3
The results show that the number of OH radicals decreases rapidly and the number of o atoms follows a rule of increasing firstly and then decreasing from arcroot to arc tip.