论文部分内容阅读
为了研究进口参数对等离子体点火过程的影响规律,建立了燃烧室等离子体点火的数值计算模型,对燃烧室内等离子体点火时的化学反应和流场进行了数值模拟。进而分析了等离子体点火器喷出的射流速度、射流温度和混合气的进口速度等进口参数的变化对燃烧室等离子体点火过程的影响规律。结果表明:在等离子体点火器喷出的高温射流进入燃烧室后,燃烧区域向上游的扩展程度远大于向下游的扩展程度,首先在上游形成稳定燃烧;等离子体射流速度对点火延迟时间的影响相对较小,但可以增强等离子体射流的穿透能力;混合气的点火延迟时间随射流温度的升高而减小,随混合气进口速度的增大而增长。
In order to study the influence of inlet parameters on the ignition process of plasma, a numerical model for igniting the plasma of the combustion chamber was set up to simulate the chemical reaction and the flow field when the plasma ignited in the combustion chamber. Furthermore, the influence of the change of the inlet parameters such as the jet velocity, the jet temperature and the inlet velocity of the mixture on the ignition process of the plasma of the combustion chamber is analyzed. The results show that after the high temperature jet from the plasma igniter enters the combustion chamber, the expansion of the combustion zone to the upper reaches is much larger than that to the lower reaches, and stable combustion is formed upstream. The influence of plasma jet velocity on the ignition delay time But it can enhance the penetration ability of plasma jet. Ignition delay time of mixed gas decreases with the increase of jet temperature and increases with the increase of mixed gas inlet velocity.