不同头部间距下三头部燃烧室点火过程研究

Research on Ignition Process of Triple-dome Combustor with Different Distances between Each Dome

为了探讨不同头部间距对某型航空发动机燃烧室点火过程中火焰传播特性的影响,建立三头部燃烧室燃烧试验系统,开展流动与点火过程中火焰传播特性、头部间距对周向点火过程影响规律的实验研究。研究表明:燃烧室的周向点火过程具有阶段性,在初始火焰发展阶段,火焰首先顺着流线方向传递,待燃烧强度增大到一定值时,火焰才开始向其他区域延伸;在相同工况下,头部间距较小时,相邻旋流器之间的局部回流区相互影响增大,油气掺混效果增强;随头部间距增加,流动因素对火焰传播的作用减小。

A series of optical experiments were conducted to investigate the effect of different distances between each dome on the flame ignition and propagation process of earoengine with triple-dome combustor.The results show that the ignition process is staged.Initial flame core developes in the direction of local flow and it starts to propagate into other regions with the increase of combustion intensity.Under the same conditions,when the distance between each dome is closer,the mutual influence over the local recirculation zone between adjacent swirlers will increase,and the oil and gas mixing effect increases as well.When the distances between each dome increases,the effect of flow factors on flame propagation decreases.