This study is focused on the morphology of a quasi-DC discharge generated concurrently with a jet of fuel injected normally into Mach 2 crossflow. It was observed that the filamentary plasma follows the local flowfield and localizes in the shear layer between the core flow and fuel jet. The details of behavior were explored by means of stereoscopic two-dimensional imaging with subsequent image processing and three-dimensional reconstruction of the plasma filament shape. On average, the plasma filament generated by the plasma-injection module has a total length over 100 mm and a plasma power on the order of 5 kW with a typical duration of 100 ms. Specifically, the discharge is located in a mixing layer, where the fuel–oxidizer ratio varies from $1:1$ down to stoichiometric ratio further downstream. Such a behavior of filamentary plasma promotes the fuel–air mixing, and is favorable for fuel ignition and flameholding. Tests were performed in the SBR-50 supersonic wind tunnel at the University of Notre Dame.

这项研究的重点是与通常注入2马赫错流的燃料喷射同时产生的准DC放电的形态。观察到，丝状等离子体遵循局部流场，并位于岩心流和燃料射流之间的剪切层中。通过立体二维成像，随后的图像处理以及等离子灯丝形状的三维重建来探索行为的细节。平均而言，由等离子注入模块生成的等离子灯丝的总长度超过100毫米，等离子功率约为5 kW，典型持续时间为100 ms。具体来说，放电位于混合层中，燃料与氧化剂的比例从$\mathrm{1个}：\mathrm{1个}$下降到化学计量比更下游。丝状等离子体的这种行为促进了燃料与空气的混合，并有利于燃料着火和火焰保持。测试是在圣母大学的SBR-50超音速风洞中进行的。