基金项目:
国家自然科学基金 (21276232;
21507043);
广东省自然科学基金 (2014A030310196;
2016A030307009);
Project supported by National Natural Science Foundation of China (21276232, 21507043), Natural Science Foundation of Guangdong Province (2014A030310196, 2016A030307009);
For the realization of a well combination of plasma and catalyst, a back corona discharge (BCD) system was built with discharge electrode, auxiliary electrode, catalyst and grounded electrode. The process of back corona discharge and the characteristics of plasma generated were studied by using voltage-current curve, imaging analysis, spectrum analysis, and particle image velocimetry (PIV). The experimental results show that, based on the DC corona discharge, back corona plasma can be generated by the secondary discharge in the particle layer or in the surface layer and channel of honeycomb. The discharge current increases significantly as the BCD occurs, and the current is more than twice that of a typical corona discharge at the same applied voltage. The second positive system of N2 is the mainly active species in BCD zone, and the strong emission lines with wavelength of 337.13 nm and 357.69 can be observed. The flow field distribution will be completely changed and the ions wind with the velocity more than 1.0 m/s is generated when BCD occurs. The propagation of streamer to spark will be reduced by using the auxiliary electrode, so that the stable BCD is realized.
KEY WORDS :corona discharge;back corona;honeycomb channel discharge;catalysis;flow field;non-thermal plasma;
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