In order to explore the influence of low pressure on ignition process, the ignition performance of a linear combustor with five burners was experimentally investigated at ambient temperature and low pressure. At air pressure drops of 1%, 2% and 3%, the influence of low pressure on the lower boundary of the ignition equivalence ratio and ignition delay have been carried, and the high-speed camera was used to record the flame propagation at various time. The results indicate that the minimum ignition equivalence ratio increases with the decrease of pressure. And, the lower the pressure, the more obvious the influence of pressure on the ignition boundary. At the same air pressure, the minimum ignition equivalent ratio decreases with the increase of the air pressure drop. For the process of ignition delay, the air pressure mainly affects the evaporation of droplets and the chemical delay process, and the air pressure drop mainly affects the physical delay stage. For the process of flame propagation, the flame moves between adjacent burners in a symmetrical pattern under various pressures. The air pressure mainly affects the ignition delay process, and the air pressure drop influences the ignition delay and the flame propagation in the early stage (the light-around from single burner to three-burners). The time needed to achieve stable combustion is the shortest at the air pressure drop of 2%.

为了探索低压对点火过程的影响，在环境温度和低压下，对具有五个燃烧器的线性燃烧器的点火性能进行了实验研究。在气压分别下降1％，2％和3％时，已承受了低压对点火当量比和点火延迟下限的影响，并使用高速摄像机记录了各种条件下火焰的传播时间。结果表明，最小点火当量比随压力的降低而增大。并且，压力越低，压力对点火边界的影响就越明显。在相同气压下，最小点火当量比随着气压下降的增加而减小。对于点火延迟的过程，气压主要影响液滴的蒸发和化学延迟过程，气压下降主要影响物理延迟阶段。对于火焰传播的过程，火焰在各种压力下以对称方式在相邻的燃烧器之间移动。气压主要影响点火延迟过程，而气压下降会影响点火延迟和早期火焰传播（从单燃烧器到三燃烧器的轻微燃烧）。在2％的气压下降时，实现稳定燃烧所需的时间最短。气压主要影响点火延迟过程，而气压下降会影响点火延迟和早期火焰传播（从单燃烧器到三燃烧器的轻微燃烧）。在2％的气压下降时，实现稳定燃烧所需的时间最短。气压主要影响点火延迟过程，而气压下降会影响点火延迟和早期火焰传播（从单燃烧器到三燃烧器的轻微燃烧）。在2％的气压下降时，实现稳定燃烧所需的时间最短。