Large Eddy Simulation of nanosecond plasma enhanced ignition of H2 jets injected into supersonic O2 crossflow

Sharath Nagaraja, Liwei Zhang, Vigor Yang

研究成果: Conference contribution

摘要

The ignition and combustion of H2 jets injected into a supersonic O2 crossflow is investigated using high fidelity Large Eddy Simulations. Nanosecond plasma discharges are studied for their potential to produce radicals and impact on the flame-holding process. A subsonic H2 jet is injected at an angle of 60° to the vertical axis upstream of the plasma zone, whereas a sonic jet was injected transversely downstream, with the jet momentum ratios of 0.1 and 3.0 respectively. The discharge pulses are simulated using a reduced-order plasma model. The discharge domain was assumed to be a cubic region of dimensions 10×3×4 mm3 with pre-specified constant values of E/N and electron density. It is observed that atomic oxygen is the primary radical produced by the plasma pulses through electron impact dissociation of O2. The O atoms produced by the discharge and fuel from the jet are spread by the jet vortices, which then aid in rapid ignition and heat release. Radicals generated by the discharge process result in improved ignition just upstream of the second jet near the boundary regions as well at higher z/D locations. The presence of a large combustion zone at x/D = 12 excites instabilities along the jet periphery which grow downstream resulting in folding up of the shear layer and improved fuel-oxidizer mixing and combustion. Two distinct flames are observed downstream of each of the injector with the plasma source switched on. The first flame is weaker and less spread out, and acts as a source of radicals and partial products in igniting and holding a stronger flame downstream.

原文English
主出版物標題45th AIAA Plasmadynamics and Lasers Conference
發行者American Institute of Aeronautics and Astronautics Inc.
ISBN(列印)9781624102905
出版狀態Published - 2014
事件45th AIAA Plasmadynamics and Lasers Conference 2014 - Atlanta, GA, United States
持續時間: 2014 六月 162014 六月 20

出版系列

名字45th AIAA Plasmadynamics and Lasers Conference

Conference

Conference45th AIAA Plasmadynamics and Lasers Conference 2014
國家/地區United States
城市Atlanta, GA
期間14-06-1614-06-20

All Science Journal Classification (ASJC) codes

  • 電氣與電子工程
  • 凝聚態物理學

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