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。

It was found that the gas temperatures at arc root and arc tip are equal and they decrease with the argon flow rate increasing.

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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。

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 arc root.

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结果表明：沿等离子体从弧根到弧梢位置，OH自由基数量迅速减少，O原子数量呈现先增多后减少的规律。

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 arc root to arc tip.

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