Experimental studies of the combustion process of circular transverse methane jets in crossflow are carried out both at stable combustion conditions and approaching flameout. It is found that under stable combustion, a steady recirculation zone is formed downstream of the jet, and the mixing coefficient is basically constant under different conditions. Thus, the excess air coefficient in the recirculation zone is also basically constant, and the combustion temperature and combustion efficiency almost don't change with the overall excess air coefficient, especially in the back half of the recirculation zone, within the experiment extent. Under stable combustion, high combustion efficiency is observed at a short distance downstream of the jet. When the flame approaches to extinguished, the recirculation zone cannot exist steady, resulting in a sharp increase of the excess air coefficient and a sharp decrease of the combustion temperature in the combustion zone. Approaching flameout, the flame oscillates distinctly, dissipates heat and energy during the oscillation process, then goes out.

在稳定燃烧条件和接近熄火条件下，对圆形横向甲烷射流在横流中的燃烧过程进行了实验研究。研究发现，在稳定燃烧下，射流下游形成稳定回流区，混合系数在不同条件下基本恒定。由此可见，回流区的过量空气系数也基本恒定，燃烧温度和燃烧效率几乎不随整体过量空气系数的变化而变化，特别是回流区的后半部分，在实验范围内。在稳定燃烧下，在射流下游的短距离处观察到高燃烧效率。当火焰接近熄灭时，回流区无法稳定存在，导致燃烧区过量空气系数急剧增加，燃烧温度急剧下降。接近熄火时，火焰明显震荡，在震荡过程中散发热量和能量，然后熄灭。