This paper considers the modes of plasma-stabilized supersonic combustion in a cavity-based flameholding configuration. The testing was performed in the SBR-50 supersonic facility at the University of Notre Dame under the following conditions: Mach number M = 2, stagnation pressure and temperature P₀ = 1–3.2 bar, T₀ = 295–750 K, and an ethylene injection rate of ṁ_C2H4 = 0–8 g/s. A rail type electric discharge is employed in this work, which represents a modification of the previously explored quasi-DC (Q-DC) configuration. Two principally different cases are realized and described in detail: in- or over-the-cavity combustion, and bulk combustion characterized by a significant increase of pressure downstream of the fuel injection ports. Rail discharge performance is compared to the performance of Plasma-Injection Modules (PIMs) using a 1D analysis. Dimensionless analysis of the plasma-assisted combustor performance indicates reasonable agreement of the in-cavity combustion mode with the Ozawa stability diagram, while the plasma-assisted bulk combustion is essentially distinct from this formalism.

本文考虑了基于腔的火焰保持构造中等离子体稳定的超音速燃烧的模式。测试是在以下条件下在圣母大学的SBR-50超音速设施中进行的：马赫数M = 2，停滞压力和温度P ₀  = 1–3.2 bar，T ₀  = 295–750 K，以及M的乙烯注入速率_C2H4 = 0–8 g / s。在这项工作中采用了轨道式放电，这是对先前探索的准DC（Q-DC）配置的修改。实现并详细描述了两种主要不同的情况：腔内燃烧或腔内燃烧，以及以燃料喷射口下游的压力显着增加为特征的整体燃烧。使用一维分析将轨道放电性能与等离子注入模块（PIM）的性能进行比较。等离子体辅助燃烧器性能的无量纲分析表明腔内燃烧模式与Ozawa稳定性图合理吻合，而等离子体辅助本体燃烧与这种形式主义本质上是不同的。