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为研究空气等离子体射流点火器的光谱特性,以空气作为点火器的工作介质进行了等离子体点火器射流实验。测量了以空气为工作介质的等离子体点火器的发射光谱,计算了等离子体点火射流的电子温度、转动温度和点火射流温度,研究了工作介质质量流量、点火驱动电源输出电流对电子温度和点火射流温度特性的影响。实验结果表明:空气等离子体射流点火器喷出的等离子体射流发射光谱中主要包括2 2NO(BΠ→XΠ)的β带谱线和2 2NO(A XΠ)+Σ→的γ带谱线、氮气第二正带系3 32 uN(CΠBΠ)g→的振动态谱线、氮气离子第一负系2 22N(B X)u g+++Σ→Σ的振动态谱线,以及氧原子、氮原子谱线;通过对发射光谱中氮气离子第一负系2 22N(B X)u g+++Σ→Σ谱带在390~391.6 nm范围进行拟合,典型状态下,等离子体点火器射流的转动温度为3 500 K;电子温度和点火器的射流温度随射流远离阳极喷口先升高后降低,随工作介质质量流量的增大而逐渐降低,随点火驱动电源输出电流的增大而升高。
In order to study the spectral characteristics of air plasma jet igniter, the plasma ignition jet experiment was carried out using air as the working medium of the igniter. The emission spectra of the plasma igniter with air as the working medium were measured. The electron temperature, the rotation temperature and the jet temperature of the plasma jet were calculated. The effects of the working medium mass flow rate, the output current of the ignition driving source on the electron temperature and ignition Influence of jet temperature characteristics. The experimental results show that the emission spectrum of the plasma jet emitted by the air plasma jet igniter mainly includes the β band spectrum of 2 2 NO (BΠ → XΠ) and the γ band spectrum of 2 2 NO (A XΠ) + Σ →, and the nitrogen The second positive band is the vibrational state line of 3 32 uN (CΠBΠ) g →, the vibrational state line of the first negative line of nitrogen ion 2222N (BX) u g +++ Σ → Σ, and the vibrational state line of oxygen atom, nitrogen atom Spectral line; by fitting the first negative line of nitrogen ion 2222N (BX) ug +++Σ → Σ band in the emission spectrum in the range of 390-391.6 nm, under typical conditions, the rotation of the plasma igniter jet The temperature is 3 500 K; the temperature of the electron and the temperature of the jet of the igniter increase first and then decrease as the jet flows far away from the anode jet orifice, and gradually decrease with the increase of the working medium mass flow rate, and increase with the increase of the output current of the ignition driving power.