摘要
本文旨在分析使用负压衰减法对汽车燃油蒸发控制系统进行泄漏监测时,泄漏孔位置对系统气相空间内的压力和流场特性的影响。首先通过建立气相空间的总压模型得到瞬态模型边界条件,然后采用1 mm泄漏孔的上方泄漏和侧向泄漏的瞬态模型进行分析,最后进行1 mm标准孔泄漏验证试验。结果表明:在衰减时间30-39 s内,气相空间内除泄漏孔与管路附近外,其余各处压力基本相等;阀管路中的最大压力高于循环管中的最大压力;上方泄漏时的气相空间负压衰减速率高于侧向泄漏;衰减时间30-39 s为较佳的监测时段。
This paper aims to analyze the effect of the position of leak hole on the pressure and flow field characteristics in vapor space of vehicle evaporative control system when adopting vacuum decay method in leak monitoring.Firstly,the numerical model for total pressure in vapor space is built to obtain the boundary conditions of transient models.Then transient models with 1 mm leak hole for upward and sideward leaks are analyzed.Finally,verification test with 1 mm reference hole is conducted.Results show that in decay time 30-39 s the pressure in vapor space is basically equal everywhere except in the vicinity of leak hole and pipeline.The maximum pressure in the pipeline with valves is higher than that in circulating pipe.Vacuum decay rate in upward leak is higher than that in sideward leak.Decay time 30-39 s is the preferred leak monitoring period.
作者
何仁
方妍月
He Ren;Fang Yanyue(School of Automobile and Traffic Engineering,Jiangsu University,Zhenjiang 212013)
出处
《汽车工程》
EI
CSCD
北大核心
2019年第11期1341-1346,共6页
Automotive Engineering
基金
江苏省科技成果转化项目(BA2016148)
江苏省产学研合作前瞻性联合研究项目(BY2015064-09)资助
关键词
车辆
泄漏监测
负压衰减
泄漏孔
vehicle
leak monitoring
vacuum decay
leak hole
