Effect of Plasma-Enhanced Low-Temperature Chemistry on Deflagration-to-Detonation Transition in a Microchannel
Effect of Plasma-Enhanced Low-Temperature Chemistry on Deflagration-to-Detonation Transition in a Microchannel
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DOI：
10.2514/1.j062966
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发表时间：
2023-08
期刊：
影响因子：
2.5
通讯作者：
Madeline Vorenkamp;S. Steinmetz;Xingqian Mao;Zhiyu Shi;A. Starikovskiy;Y. Ju;C. Kliewer
中科院分区：
文献类型：
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作者：
Madeline Vorenkamp;S. Steinmetz;Xingqian Mao;Zhiyu Shi;A. Starikovskiy;Y. Ju;C. Kliewer
这项研究考察了纳秒介质阻挡放电(ns-DBD)等离子体对二甲醚(DME)/氧[公式：见文本](Ar)预混料在微通道中用于爆燃转爆轰(DDT)的低温化学(LTC)强化。研究发现，非平衡等离子体产生活性物种，动力学地加速了DME和DDT的LTC。激光原位诊断和计算模型使用甲醛([公式：见文本])、激光诱导荧光(LIF)和高速成像检测了ns-DBDS对DME和DDT的LTC的影响。首先，利用高速成像和激光诱导荧光相结合的方法，跟踪LTC在整个火焰传播和DDT过程中的存在。然后，用激光诱导函数研究了等离子体强化点火LTC与等离子体辅助部分燃料氧化降低燃烧放热率之间的竞争关系。借助详细的动力学模拟，解释了等离子体增强LTC对DDT的影响。结果表明，适量的ns-DBD提高了DME的LTC，增加了[式：见文本]的生成和低温着火，加速了DDT。此外，研究还发现，随着ns-DBD的增多，[公式：见正文]浓度降低，表明过量排放可能会加速燃料在预混料中的氧化，减少放热，减弱冲击-点火耦合，抑制DDT。
This study examines low-temperature chemistry (LTC) enhancement by nanosecond dielectric barrier discharge (ns-DBD) plasma on a dimethyl ether (DME)/oxygen [Formula: see text] (Ar) premixture for deflagration-to-detonation transition (DDT) in a microchannel. It is found that non-equilibrium plasma generates active species and kinetically accelerates LTC of DME and DDT. In situ laser diagnostics and computational modeling examine the influence of the ns-DBDs on the LTC of DME and DDT using formaldehyde ([Formula: see text]) laser-induced fluorescence (LIF) and high-speed imaging. Firstly, high-speed imaging in combination with LIF is used to trace the presence of LTC throughout the flame front propagation and DDT. Then, competition between plasma-enhanced LTC of ignition and reduced heat release rate of combustion due to plasma-assisted partial fuel oxidation is studied with LIF. Observations of plasma-enhanced LTC effects on DDT are interpreted with the aid of detailed kinetic simulations. The results show that an appropriate number of ns-DBDs enhances LTC of DME and increases [Formula: see text] formation and low-temperature ignition, accelerating DDT. Moreover, it is found that, with many ns-DBDs, [Formula: see text] concentration decreases, indicating that excessive discharges may accelerate fuel oxidation in the premixture, reducing heat release and weakening shock–ignition coupling, inhibiting DDT.