关键词: 燃烧室；不均匀流；火焰稳定器；总压损失；燃烧性能

Abstract: To conduct the ramjet combustor design under non-uniform flow，experiments，from which combustion characteristics were obtained，were carried out on a V-gutter flameholder under 2D non-uniform incoming flows with different inlet velocity coefficient，temperature and fuel/air ratio (FAR). Results show that the ignition FAR increases initially and then drops off along with the growth of inlet velocity coefficient when the inlet flow is uniform，h/H=3/6(h/H stands for relative Vmax position) and h/H=5/6，except h/H=4/6 under which the ignition FAR always increases. Besides，the best ignition performance is obtained under the uniform incoming condition. In addition，the ignition FAR rises as the non-uniformity degree increased under conditions of h/H=3/6，h/H=4/6 and h/H=5/6. On lean blow-off(LBO) aspects，the LBO FAR increases firstly and then goes oppositely as the non-uniformity degree increases when h/H=3/6 and h/H=4/6. Finally，if the velocity coefficient equal to 0.10，the best combustion performance shows up at uniform incoming flow and h/H=3/6，while the worst at h/H=5/6.

Key words: Combustor；Non-uniform inlet flows；Flameholder；Total pressure loss；Combustion performance