高速气流条件下的喷嘴与火焰稳定器匹配特性研究

The Investigation of Matching of Injectors and Flameholder in High Speed Airflow

针对亚燃冲压发动机燃烧室内部流动特点,在二元稳定器气流试验装置中使用拍摄OH基自发光辐射的方法,研究了火焰稳定器与喷嘴以不同间距匹配情况下的燃烧特性,利用气液两相流模型数值仿真手段,分析了试验工况下燃油雾化液滴与稳定器后方油气比的分布情况。通过对比分析认为,高速气流条件下喷嘴与火焰稳定器间距变化对反应流场影响明显,喷-稳距离增大使火焰前沿位置靠近稳定器尾缘,气流速度较低时出现回火。喷-稳距离减小能够避免回火现象,且气流速度较高时火焰悬停距离大。喷-稳距离增大有利于燃油液滴的蒸发和掺混是影响匹配试验火焰前沿位置靠近稳定器的根本因素。

Based on the flow characteristics of ramjet combustion chamber,combustion characters match of the flameholder and injectors is investigated by means of photography of using OH spontaneous radiation,and the two-phase flow numerical simulation.The influence of distance between the flameholder and the injectors on the fuel-air equivalence ratio distribution behind the flameholder is analyzed.The experiment results indicate that the space between the flameholder and injectors has signiticant influence on the reaction flow.When the space between the flameholder and injectors increased,the flame was closed to flameholder.And the flame flashed back when the velocity of air was low.when the space between the flameholder and injectors shortened,the flame flash back could avoided and the lift-off distance of the flame became small.The flame located close to the flameholder was due to improved vaporization and mixing at a big space between the flameholder and injectors.