基于预燃室湍流射流点火氨燃料着火燃烧过程研究
Study on the ignition and combustion process of ammonia with pre-chamber turbulent jet ignition(PTJI)
为探究预燃室湍流射流点火模式下氨燃料的着火燃烧特性,本研究应用CONVERGE三维数值模拟软件,建立带有预燃室射湍流射流点火系统的定容燃烧弹三维数值模型,开展了预燃室喷射氢气射流点火模式下氨燃料着火燃烧过程的模拟研究。研究发现,在主燃烧室进气过程和点火后预燃室燃烧的影响下,主、预燃室之间的流动过程可分为四个阶段,预燃室内混合气着火后,压力迅速升高,火焰夹带着未燃混合气和燃烧产物形成由预燃室流向主燃烧室的高速射流;点火时刻,在主、预燃室之间气体流动与氢气喷束的共同作用下,预燃室内形成局部过浓区、均质混合气区和稀薄混合气区;整体着火燃烧过程分为三个阶段:冷态射流阶段、射流火焰点火阶段和主燃烧室快速燃烧阶段。
In order to investigate the ignition and combustion characteristics of ammonia under turbulent jet ignition(TJI)mode,in this work,a three-dimensional numerical model of the constant volume combustion bomb(CVCB)with a TJI system was built in the numerical simulation software CONVERGE.And the ignition and combustion of ammonia was studied under TJI mode fueled with hydrogen in the pre-chamber.The results showed that,impacted by the intake process of the main combustion chamber and pre-chamber combustion after ignition,the flow between main combustion chamber and pre-chamber cane be divided into four stages.The pressure in the pre-chamber increases after the ignition and combustion of pre-chamber mixture,and a high-speed jet from the pre-chamber towards the main combustion chamber forms causing by the pre-chamber flame entrained the unburned mixture and combustion products.At spark timing,under the combined action of gas flow between the main combustion chamber and pre-chamber and hydrogen injection,the pre-chamber can be divided into three zones:over-rich mixture zone,homogeneous mixture zone and lean-mixture zone.Moreover,the overall combustion process can be divided into three stages:cold jet stage,jet flame ignition stage,and fast combustion stage in the main combustion chamber.
刘宗宽;钟力嘉;张晓军;刘丰年;周磊;卫海桥;
天津大学,内燃机燃烧学国家重点实验室,天津 300072;天津大学,内燃机燃烧学国家重点实验室,天津 300072;天津大学,内燃机燃烧学国家重点实验室,天津 300072;天津大学,内燃机燃烧学国家重点实验室,天津 300072;天津大学,内燃机燃烧学国家重点实验室,天津 300072;天津大学,内燃机燃烧学国家重点实验室,天津 300072;
TK431
ammonia pre-chamber turbulent jetignition combustion engine
1-8 / 8
评论