冯钟辉,周磊,刘培林,等.不同预燃室结构对甲烷湍流射流点火燃烧的影响[J].内燃机工程,2021,42(5):29-35.
不同预燃室结构对甲烷湍流射流点火燃烧的影响
Effect of turbulent jet ignition based on different pre-chamber structures on the combustion characteristics for methane fuel
DOI：10.13949/j.cnki.nrjgc.2021.05.005
关键词:甲烷  湍流射流点火  多级加速预燃室  火焰传播速度  着火机理
Key Words:Methane  Turbulent Jet Ignition(TJI)  Multi-stage accelerated pre-chamber  Flame velocity  Ignition mechanism
基金项目:国家自然科学基金资助项目(91641203);国家杰出青年科学基金(51825603)
作者单位E-mail
冯钟辉 天津大学 内燃机燃烧学国家重点实验室 18940130966@163.com 
周磊* 天津大学 内燃机燃烧学国家重点实验室 lei.zhou@tju.edu.cn 
刘培林 天津大学 内燃机燃烧学国家重点实验室  
高强 天津大学 内燃机燃烧学国家重点实验室  
李匡迪 天津大学 内燃机燃烧学国家重点实验室  
卫海桥 天津大学 内燃机燃烧学国家重点实验室  
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摘要:基于光学定容燃烧弹实验平台,通过高速纹影摄像系统在甲烷燃料相同初始温度、压力及混合气浓度下,定量分析了不同结构预燃室TJI点火的燃烧特性,包括火焰传播速度、火焰面积、火焰形态及燃烧压力等参数。研究结果表明,预燃室孔径越小相同时间内火焰传播得越远,火焰传播速度和火焰面积增长速度越快,燃烧压力峰值越高。随着预燃室孔径减小着火机理会由射流中带有火焰的火焰点火,转变为火焰过孔时熄灭的喷射点火。喷射点火与火焰点火相比着火时刻延迟,初始火焰速度减慢,但燃烧压力峰值受影响不大。多级加速预燃室压力升高率与压力峰值与单孔预燃室相比变化不大,虽然火焰出口时速度较慢,但是火焰出口时刻提前且速度衰减较弱,因此,多级加速预燃室火焰速度在短时间内超过单孔预燃室,并且压力和火焰面积也更早达到最大值。
Abstract:The combustion characteristics of methane fuel under different pre-chamber structures, including flame propagation velocity, flame area, flame morphology and combustion pressure, were quantitatively analyzed by high-speed photogrammetry based on the constant volume combustion bomb. The results showed that smaller aperture can lead to larger penetrations within the same time, as well as higher peak pressure, faster flame velocity, and larger flame area growth rate. As the aperture become smaller enough, the ignition mechanism will change from flame ignition (with flame in the jet) to jet ignition (flame quenches when passing through the orifice). In the case of jet ignition, ignition timing is delayed and initial flame velocity is also slowed down, while the peak pressure is almost unaffected. Similar peak pressures and pressure rise rates were observed in all pre-chamber structures, though the exit velocity in multi-stage pre-chambers was lower. The slower velocity deceleration in multi-stage pre-chambers made the flame advances that in other single-stage pre-chambers in a short time. Meanwhile, the pressure and the flame area reached its maximum value earlier.
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