不均匀流对V型火焰稳定器燃烧性能的影响

Effects of Non-Uniform Incoming Flows on Combustion Characteristics of a V-Gutter Flameholder

关键词:  燃烧室  不均匀流  火焰稳定器  总压损失  燃烧性能

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

摘要:

为指导畸变进气条件下的冲压发动机燃烧室设计，对V型火焰稳定器在二维不均匀来流条件下的燃烧性能进行了试验研究，获得了不同进口速度系数、温度和油气比下的燃烧性能。研究结果表明:在进口速度均匀，h/H=3/6(h/H表示进口最大速度相对位置)和h/H=5/6分布时，随着进口速度系数的增加，点火油气比先增加后减小，在h/H=4/6分布时，点火油气比逐渐增加；当进口速度均匀分布时点火性能最好；在h/H=3/6，h/H=4/6和h/H=5/6分布时，随着速度不均匀度的增加，点火油气比增大；在h/H=3/6和h/H=4/6分布时，随着速度不均匀度的增加，熄火油气比先增大后减小；当速度系数为0.1时，进口速度均匀和h/H=3/6分布时燃烧效率较高，h/H=5/6分布时燃烧效率最低。

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.