摘要
采用气道稳流试验、CFD数值模拟的方法,研究了YN单螺旋进气道柴油机进气门的气门锥角α、气门背锥角β和气门背面圆弧半径R对进气性能的影响,并通过正交试验方法优化了原机气门结构,分析了优化模型对缸内气流运动及燃烧特性的影响。结果表明:气门锥角对进气性能的影响最大,其次是气门背锥角和气门背面圆弧;对于正交试验得到的优化模型(α为35°,β为27°,R为16 mm),在缸内进气量小幅提升的情况下,涡流比有明显的增加,能有效组织缸内气流运动,促进油气的充分混合,改善了缸内燃烧和排放;缸内瞬时放热率和累计放热量增加,Soot排放减少,NO_(x)排放略有增加。
The effects of valve cone angleα,valve back cone angleβand valve back arc R on intake performance of YN diesel engine with single helical intake port were studied by means of steady flow test and CFD numerical simulation.Then the original valve structure was optimized by orthogonal test method,and the influence of optimization model on in-cylinder gas movement and combustion characteristics was analyzed.The results show that the valve cone angle has the greatest impact on the intake performance,followed by the valve back cone angle and the valve back arc.For the optimization model obtained by the orthogonal experiment(α=35°,β=27°,R=16 mm),the swirl ratio increases significantly with a small increase in the in-cylinder air intake,which can effectively organize the in-cylinder airflow movement,promote the full mixing of fuel and gas,and improve the in-cylinder combustion and emission.In addition,in-cylinder instantaneous heat release rate and cumulative heat release increased,soot emissions reduced,and NO_(x) emissions increased slightly.
作者
简文铎
张韦
解礼兵
孟丽苹
李臻卓
张翔宇
JIAN Wenduo;ZHANG Wei;XIE Libing;MENG Liping;LI Zhenzhuo;ZHANG Xiangyu(Yunnan Key Laboratory of Internal Combustion Engine,Kunming University of Science and Technology,Kunming 650500,China)
出处
《车用发动机》
北大核心
2022年第4期41-48,共8页
Vehicle Engine
基金
国家自然科学基金(51665023,5166007)
云南省大学生创新创业计划(2021106740025)。
关键词
柴油机
进气门
进气性能
正交试验
结构优化
燃烧
排放
diesel engine
intake valve
intake performance
orthogonal test
structural optimization
combustion
emission
