【摘要】 撞击流反应器被广泛应用于化工、环保和制药等领域。本文采用计算流体力学方法(CFD)对撞击流反应器的非对称撞击过程进行了数值分析，研究了不同长径比(L/D)对流动特性和涡结构演化的影响。结果表明，L/D对于速度场、涡量分布和湍流特性具有显著的影响。纵向速度呈“M”型分布，L/D=5时最小。当L/D≤4时，流体的动量相对集中，湍流强度增强，从而提高混合效率;当L/D≥5时，流体动量分散，导致涡旋分散，混合效率降低。对涡结构进行进一步分析，撞击区附近的涡量极值随着L/D的增加呈现出先增大后减小的趋势，涡旋的形态也从较为集中的大回转涡向零散的涡旋结构过渡。本文为进一步优化撞击流反应器的设计提供了理论支持和实验依据。更多还原

【Abstract】 The impinging jet reactor is a highly efficient mass and heat transfer device widely used in the chemical,environmental,and pharmaceutical industries. This study focuses on optimizing the asymmetric impinging jet reactor by employing numerical simulations to investigate the effects of different length-to-diameter( L/D) ratios on flow characteristics and vortex evolution within the reactor. The results indicate that variations in the L/D ratio significantly influence the velocity field,vorticity distribution,and turbulence characteristics. The longitudinal velocity presents an " M" type distribution,with the minimum value observed at L/D = 5. When the L/D ratio is less than or equal to 4,fluid momentum is more concentrated,leading to stronger turbulence and enhanced mixing efficiency. When the L/D ratio is greater than or equal to 5,it causes vortex dispersion,thereby reducing mixing efficiency. Further analysis of vortex structures reveals that the peak vorticity near the impingement zone initially increases and then decreases as L/D increases. Additionally,vortex morphology transitions from large,concentrated vortices to more fragmented structures. This study provides theoretical support for optimizing asymmetric impinging jet reactors,offering valuable insights for enhancing their efficiency and stability in industrial applications.The paper provides theoretical support and experimental basis for further optimizing of the impinging stream reactor design.更多还原