气道形状对天然气发动机缸内气体流动与燃烧过程影响的研究  

Effect of Intake Port Geometry on In-Cylinder Flow Field and Combustion in Natural Gas Engine

作　　者：焦运景[1] 司鹏鵾 杨志勇[4] 张自立 张惠明 

机构地区：[1]天津大学天津内燃机研究所,天津300072 [2]天津大学内燃机燃烧学国家重点实验室,天津300072 [3]承德石油高等专科学校,承德067000 [4]东风南充汽车有限公司,南充637000

出　　处：《内燃机工程》2013年第3期26-31,共6页Chinese Internal Combustion Engine Engineering

基　　金：国家"八六三"高技术研究发展计划项目(2006AA11A1B2)

摘　　要：利用CFD软件对不同形状进气道的发动机进行瞬态数值模拟,并详细分析气道形状对气体运动和燃烧过程的影响。研究结果表明:随着涡流比的降低,缸内气体湍流动能增加;点火稳定性受湍流动能和气体流速影响,适当增大湍流动能可以提高火焰传播速度,但过大的湍流动能会使火核向周围混合气散热增大,降低火核温度,对火核发展不利。加工了不同方案的进气道进行装机试验,结果表明:装配1号缸盖时发动机的动力性最好,耗气率低,NOx排放适中。综合考虑,选取1号缸盖作为该点燃式天然气发动机的最优缸盖进行后续工作。Transient numerical simulation for engines with different geometry intake ports using CFD simulation software was carried out to examine their effect on in-cylinder flow field and combustion process. It was concluded that turbulence kinetic energy increased with swirl ratio reduction, ignition stability was affected by the turbulence kinetic energy and gas velocity, and increasing moderately turbulence kinetic energy could raise flame propagation speed, while excessive turbulence would lead to flame extinction. At last, actual engine tests were carried on using cylinder heads equipped with different geometry intake ports. Considered the simulation and engine test results, the No. 1 head is taken as the optimal scheme because of its best power and fuel economy, moderate emissions for successive work of the ignited natural gas engine.

关 键 词：内燃机 气道形状 天然气发动机 流动特性 燃烧过程 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]