内燃机高压共轨轨腔内的三维流动数值分析

Numerical Simulation and Analysis of the 3D Flowing in Cavity of High-Pressure Common Rail of Internal Combustion Engine

建立高压轨腔的三维不可压流体力学模型和流体力学边界条件,利用SIMPLE计算方法,并引入SSTk-ω湍流模型,模拟计算三种不同截面轨腔的压力场和速度场,分析壁面夹角与轨腔内流场的关系。结果表明:在横截面面积相同的情况下,出口中心线与轨腔壁面的夹角小于90°且大于80°的轨腔改善了轨腔内的流场特性分布。

The three-dimensional in- compressible fluid mechanics model and fluid dynamics boundary conditions in the high-pressure rail cavity is established. With SIMPLE calculation method and the introduction of the SST κ-ω turbulence model, the cross-section of three different rail cavity pressure and velocity fields are simulated and the relationship between angle of the wall and flow field in the cavity are studied. The results show that with the same cross - sectional area, the cavity of which the angle between the export centre line and rail cavity wall is less than 90° and more than 80° can improve the characteristic distribution of flow field.