Abstract
The ignition characteristics of N 2/O 2 plasma jet (PJ) in a high-speed flow were experimentally and analytically investigated. The effect of NO x , which was the major component in the N 2/O 2 PJ, on ignition was investigated by analyzing the ignition delay time. Results indicated that NO x had a strong catalytic effect on combustion reactions of H 2 and low-hydrocarbon fuels such as CH 4 and C 2H 4 at high pressure. Therefore, these results suggested that the N 2/O 2 PJ potentially had higher ignition ability than a pure O 2 or a pure N 2 PJ at high pressure. In the ignition test at atmospheric pressure, however, the PJ whose feedstock was composed of a larger mole fraction of O 2 more greatly enhanced ignition, and the O 2 PJ was most effective. A gas sampling showed that amount of the NO x in the N 2/O 2 PJ was much more than those in pure O 2 and N 2 PJs. These experimental results indicate atmospheric pressure was not high for appearance of the NO x catalytic effect. A local O 2 concentration around the ignition site was very important for successful ignition at low pressure, where the NO x catalytic effect was not strong.
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