【摘要】 氨燃料点火困难、燃烧速度慢，是氨燃料发展的主要技术瓶颈．基于定容弹实验系统，通过小孔径预燃室产生无焰强湍流射流提高主燃烧室气流湍流强度，在射流中分别采用火花塞点火(TJ-PSI)、微波辅助点火(TJMAI)和湍流射流点火(湍流增强TJI)等点火方式引燃主燃室混合气，并分析了不同点火策略下的氨/空气混合气燃烧特性．实验结果表明，TJ-PSI,TJ-MAI和湍流增强TJI等点火方式都可以大幅提升氨燃料的着火能力和燃烧速度．其中湍流增强TJI点火方式对氨燃烧的增强效果最显著，与层流球型火焰传播相比，主燃室氨/空气混合气峰值压力和峰值放热率分别提高15.2%和359%，燃烧持续期缩短81%，是一种很有前景的氨燃料发动机燃烧强化策略．更多还原

【Abstract】 The ignition difficulty and slow combustion speed of ammonia fuel are the main technical bottlenecks in the development of ammonia fuel. Based on the constant volume bomb experimental system,strong flameless turbulent jet was generated through a small-orifice pre-chamber to improve the turbulence intensity of the main combustion chamber. Spark ignition(TJ-PSI),microwave assisted ignition(TJ-MAI) and turbulent jet ignition(Turbulence-enhanced TJI) were adopted to ignite the mixed gas in the main combustion chamber. The combustion characteristics of ammonia/air mixture under different ignition strategies were analyzed. The experimental results show that TJ-PSI,TJ-MAI and turbulence-enhanced TJI can all greatly improve the ignition ability and combustion speed of ammonia fuel. Among them,the turbulence-enhanced TJI mode has the most significant enhancement effect on ammonia combustion. Compared with laminar spherical flame propagation,the peak pressure and peak heat release rate of ammonia/air mixture in the main combustion chamber are increased by 15.2% and 359%,respectively,and the combustion duration is shortened by 81%. Therefore,turbulence-enhanced TJI is a promising combustion enhancement strategy for ammonia fuel engines.更多还原