The paper presents the results of studies of longitudinal electric discharges in a supersonic air flow with a Mach number of M = 2 in the range of static pressures (2.94−4.9) × 10⁴ Pa (∼220−367 Torr) and discharge currents of ∼1.5−1.8 A during the injection of propane, ethylene, and hydrogen, along with oxygen, into the discharge zone through the two types of upstream electrodes (anodes). The design of the electric-discharge modules was such that the discharge was carried downstream by the supersonic flow and closed, mainly to the cathode located downstream. Emission spectroscopy was used to obtain data on the composition of the emitting products that arose in the processes of converting a fuel-air mixture in a discharge and their spatial distribution. In particular, data on the distribution of the radiation intensity of CN, C₂ molecules, and OH radical, as well as atomic hydrogen and oxygen in a number of sections of the discharge channel, are presented. The used methodology allowed us to determine the change in the transverse dimensions of the discharge channels along the length and the value of the rotational temperature of molecule C₂ for discharges with the injection of propane and ethylene into the discharge zone. The relationship between its value and the conditions for the formation of the discharge and the coefficient of excess oxygen injected into the discharge is established.

中文翻译：

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丙烷，乙烯和氧气注入放电区域中超音速气流中纵向放电的光谱学研究

本文介绍了在静态压力（2.94−4.9）×10 ⁴范围内马赫数M = 2的超声速气流中纵向放电的研究结果。Pa（〜220-367 Torr），在丙烷，乙烯和氢气以及氧气通过两种上游电极（阳极）注入放电区期间，放电电流约为1.5-1.8A。放电模块的设计应使放电由超声波流向下游进行，并主要关闭至位于下游的阴极。发射光谱用于获得有关在排放中将燃料-空气混合物转化的过程中产生的发射产物组成及其空间分布的数据。特别是有关CN，C ₂的辐射强度分布的数据分子，OH自由基，以及放电通道许多部分中的氢原子和氧原子都被列出。使用的方法学使我们能够确定沿丙烷C和乙烯注入到放电区中进行放电的沿通道C ₂长度的放电通道横向尺寸的变化以及分子C ₂的旋转温度值。建立其值与放电形成条件和注入到放电中的过量氧气系数之间的关系。