液体分布器布液孔减阻脱附性能分析

Performance analysis of reducing adhesion and resistance of liquid distribution orifice in liquid distributor

为了改善液体分布器布液孔的减阻脱附特性,文章建立了孔板式液体分布器的参数化模型,利用有限元软件的优化模块对布液孔进行优化,得到具有减阻脱附特性的布液孔结构。然后采用三维数字化建模软件建立新型液体分布器的三维模型,并模拟分析2种布液孔结构对壁面剪应力、速度、摩擦阻力系数和边界层分布的影响,由结果可知:与通孔型布液孔相比,圆锥形布液孔能够降低壁面剪应力、壁面速度以及摩擦系数,对壁面边界层进行有效控制。最后通过实验对模拟结果进行验证,模拟结果与实验结果能够较好地吻合,说明数值模拟能够有效地预测布液孔的减阻脱附特性。

In order to improve the reducing adhesion and resistance characteristics of liquid distribution orifice in liquid distributor,the parameterized model of liquid distributor was established. The optimization module of finite element analysis software was performed to optimize the orifice of liquid distributor,so the reducing adhesion and resistance characteristics orifice was obtained. The new 3D model was established by using 3D digital modeling software,the flow field analysis of two different kinds of liquid distributor structure was simulated by using the fluid analysis software. The influences of liquid distributor structure on the wall shear stress,velocity,friction coefficient and boundary layer were obtained in the above flow field analysis. The results show that the biomimetic liquid distribution orifice can reduce the wall shear stress,wall velocity and friction coefficient when comparing with the ordinary liquid distributor. It also can control the thickness of boundary layer. So the liquid distribution orifice has the reducing adhesion and resistance mechanism.