基金项目:
国家自然科学基金(51477135;
51607003;
11575003;
81372076;
51677146;
51521065);
陕西省自然科学基础研究计划项目(2014JQ7254);
安徽省高校自然科学基金重点项目(KJ2016A194);
Project supported by National Natural Science Foundation of China (51477135, 51607003, 11575003, 81372076, 51677146, 51521065), Natural Science Basic Research Plan in Shaanxi Province of China (2014JQ7254), Key University Science Research Project of Anhui Province (KJ2016A194);
In order to deeply understand the differences of DBD characteristics of methane gas between plate-to-plate and multi-needles to plate electrode structures in low pressure, we mainly measured the discharge properties of the two kinds of electrode structures, and investigated the variation trend of discharge electric parameters as a function of different pressures. The emission spectrum of discharge was measured by iStar DH 334T, and the rotational temperature of CH molecule was diagnosed. The variation regularity of gas temperature can be obtained by the law that rotational temperature, which is similar to gas temperature. The results shows that when the air gap is constant, the two electrode structures gradually transit to unstable status with the increase of gas pressure. Discharge radius gradually decrease, and present an obvious appearance of concentric circles. Compared to plate-to-plate electrode structures, multi-needles to plate electrode array structures have a higher discharge current in the positive half cycle of voltage and a lower discharge current in the negative half cycle of voltage, respectively. When gas pressure is relatively high, the ignition voltage of multi-needles to plate electrode array structures is relatively low. The spectrum calculation results indicate that gas temperature of multi-needles to plate electrode array structures is low.
KEY WORDS :low pressure;dielectric barrier discharge;pattern;discharge characteristic;spectral characteristic;discharge morphology;
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