基于数值模拟的汽油机喷嘴结构优化CFD分析

Numerical simulation and CFD optimization analsis nozzle on structure of gasoline engine

中文关键词: 数值模拟  喷嘴  结构优化  流动特性

英文关键词: numerical simulation  nozzle  structure optimization  flow characteristics

中文摘要:

      以5WY-2817A汽油机喷嘴为研究对象,旨在提高该汽油机喷嘴流动特性,利用UG软件对喷嘴进行实体建模,通过喷雾稳态试验对模拟计算提供边界条件。利用AVL-FIRE软件进行喷嘴稳流三维数值计算,研究了不同压力室高度、喷孔分布直径和阀座锥角对喷孔处压力与速度的影响关系。研究结果表明,压力室高度0.2mm,喷孔分布直径1.4mm,阀座锥角43°时喷孔处燃油流动特性最佳。该结构优化可作为改善喷嘴雾化性能的最佳方案。

英文摘要:

      The nozzle of 5WY-2817A gasoline engine was studied to improve the flow characteristics of the engine nozzle. The UG software was used to establish the nozzle model, and the boundary condition was provided by the steady state spray test. Three dimensional numerical simulation of nozzle steady flow was carried out by using AVL-FIRE software. The influence of different height of pressure chamber, diameter of nozzle distribution and valve seat cone angle on pressure and velocity at injection hole was studied. The results show that the height of pressure chamber is 0.2 mm, the diameter of nozzle distribution is 1.4 mm, the valve seat cone angle is 43 degrees can get the best fuel flow characteristics at the nozzle hole. The optimization of the structure can be used as the best project to improve the atomization performance of the nozzle.