双直喷型柴油JCCI模式的参数优化数值模拟  

Numerical Simulation of Parameter Optimization in Dual-Direct Injection Diesel JCCI Mode

作　　者：王健[1] 礼博 张恒 姜龙龙 隆武强[1] 田华 Wang Jian;Li Bo;Zhang Heng;Jiang Longlong;Long Wuqiang;Tian Hua(School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China;College of Power and Energy Engineering,Harbin Engineering University,Harbin 150001,CHina)

机构地区：[1]大连理工大学能源与动力学院,大连116024 [2]哈尔滨工程大学动力与能源工程学院,哈尔滨150001

出　　处：《燃烧科学与技术》2023年第5期552-560,共9页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51379034);黑龙江省自然科学基金资助项目(LH2023E067).

摘　　要：针对双直喷型柴油射流控制压燃模式,利用三维数值模拟结合优化算法,分析了预喷正时、射流正时、初始温度、初始压力和预喷射能量比等参数对发动机燃烧与排放性能的影响.计算结果表明,射流正时可以有效控制着火相位和燃烧相位,预喷正时主要影响预混合气燃烧后期.当燃烧相位在6~8°CA ATDC区间时,发动机经济性最佳.射流正时和预喷正时均较晚时,燃烧呈现两阶段高温放热过程,整体燃烧速率大于射流正时与预喷正时均较早的单阶段高温放热过程,因此等效燃油消耗率下降6.80 g/(kW·h).The three-dimensional(3D)numerical simulation combined with optimization algorithm is employed to study the effects of pre-injection timing,jet-injection timing,initial temperature,initial pressure and energy ratio on engine combustion and emission performance in a dual-direct injection diesel jet control compression ignition(JCCI)mode.The results show that jet-injection timing can effectively control ignition phase and combustion phase,and pre-injection timing mainly affects the late combustion of the premixture.When the combustion phase is in the range of 6—8°CA ATDC,the engine economy is the best.When jet-injection timing and pre-injection timing are both late,the combustion presents a two-stage high temperature heat release process,and the overall combustion rate is greater than that of the single-stage high temperature heat release process,so the equivalent indicated specific fuel consumption(EISFC)decreases by 6.80 g/(kW·h).

关 键 词：柴油射流控制压燃 双直喷 三维数值模拟 射流正时 预喷正时 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]