On pulse-to-pulse coupling in low-temperature filamentary plasma-assisted ignition in methane-air flows

被引:5
|
作者
Patel, Ravi [1 ,2 ]
van Oijen, Jeroen [2 ]
Nijdam, Sander [1 ]
Dam, Nico [2 ]
机构
[1] Eindhoven Univ Technol, Dept Appl Phys, POB 513, NL-5600 MB Eindhoven, Netherlands
[2] Eindhoven Univ Technol, Dept Mech Engn, POB 513, NL-5600 MB Eindhoven, Netherlands
来源
PLASMA SOURCES SCIENCE & TECHNOLOGY | 2023年 / 32卷 / 06期
关键词
nanosecond pulsed DBD plasma; plasma-assisted combustion; plasma spectroscopy; TURBULENT PREMIXED FLAME; NANOSECOND; DISCHARGE; COMBUSTION; STABILIZATION; DIAGNOSTICS;
D O I
10.1088/1361-6595/acd65c
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
This work aims to characterize the effects of pulse repetition rate (PRR) and flow speed on dielectric barrier discharge (DBD) plasma pulse-to-pulse coupling and its ability to ignite methane-air flows. Experiments are performed on a homemade DBD flow reactor with 5 mm discharge gap. Pressure and equivalence ratio are kept constant at 700 mbar and 0.6. First, we perform high-speed intensified imaging to visualize pulse-to-pulse plasma behavior and ignition kernel development. In air flows, plasma morphology changes from multiple weak filaments to a few stronger filaments indicating plasma pulse-to-pulse coupling. This leads to plasma energy addition in nearly the same gas volume as the previous discharge. The study performed in methane-air flows highlights the importance of plasma pulse-to-pulse coupling for ignition. We find a critical PRR and a minimum number of pulses required to achieve a strong enough coupling to develop a successful ignition kernel. Ignition probability and kernel growth are also evaluated for various conditions. Finally, plasma pulse-to-pulse coupling is quantified by measuring the plasma parameters such as gas temperature and reduced electric field from an optical emission spectroscopy.
引用
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页数:17
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