汽油机喷嘴流动的CFD分析  

CFD Analysis on the Flow of Gasoline Engine Nozzle

作　　者：刘孟莹[1] 姜峰[1,2] 张洪涛[1,2] 

机构地区：[1]广西科技大学广西汽车零部件与整车技术重点实验室,广西柳州545006 [2]广西科技大学车辆动力与新能源重点研发中心,广西柳州545006

出　　处：《机械工程师》2015年第10期42-44,共3页Mechanical Engineer

基　　金：广西自然科学基金项目(2013GXNSFAA019317);广西高校科学技术研究项目(KY2015YB168);广西重点实验室建设项目(14-A-01-04);广西重点实验室开放基金项目(2014KFMS02)

摘　　要：为了研究喷嘴内部的燃油流动特性,以便对喷嘴结构参数的优化设计提供重要理论依据,利用Solid Works、Hyper Mesh、AVL-Fire3个软件对喷嘴进行建模以及仿真分析,通过与实验值对比,验证了模型的有效性。研究了不同针阀升程下喷嘴内部的压力场和速度场。结果表明:当针阀升程较小时(h≤0.125 mm),每一瞬时的压力流场变化较大;当针阀升程较大时(h≥0.18 mm),每一瞬时的压力流场变化较小;随着针阀升程的增大,喷孔出口处的速度值上升。文中的研究不仅真实地反映了喷嘴内部的流动特性,同时也为燃烧室的设计提供了理论依据。In order to study the fuel flow characteristics inside the nozzle, as an theoretical basis for the optimization of nozzle structure parameters design, we use the Solid Works,Hyper Mesh and AVL-Fire software to model the nozzle and analyze the simulation. We verily the validity of the model by comparing with the experimental value. Here we study the pressure field and velocity field inside the nozzle under different needle valve lift. Our results indicate that when the needle valve lift is small （h ≤0.125 ram）, each instantaneous pressure flow field may change greatly; when the needle valve is large （h≥0.18 ram）, each instantaneous pressure flow field may change little; when the needle valve lift increases, the speed of the nozzle exit value may rise. Our results not only reflect the flow characteristics of the nozzle, but also provide a theoretical basis for the design of the combustion chamber.

关 键 词：汽油机 喷嘴 CFD 流场分析 

分 类 号：TK41[动力工程及工程热物理—动力机械及工程]