基于Fluent的排气火花熄灭消声器性能仿真分析

为掌握火花熄灭消声器内部流动特性,采用湍流模型和离散相(DPM)模型对双级膨胀腔消声器内气固两相流动情况进行了数值模拟研究。通过建立的模型和边界条件模拟气体流动,利用双向耦合拉格朗日法追踪颗粒运动轨迹;讨论了不同颗粒粒径、入口颗粒浓度以及不同排气流速对火花熄灭效率和压力损失的影响。数值计算结果表明:随着颗粒粒径、入口颗粒浓度及排气流速的增加,火花熄灭效率逐渐增大,特别是颗粒粒径和排气流速对火花熄灭效率影响比较明显。

Performance Analysis of Exhaust Sparks Muffler Based on Fluent

To master the internal flow characteristics of the exhaust sparks muffler, the standard model and DPM model in Fluent was used to investigate the gas-granule two-phase flowability in the silencer, and to calculate the gas-phase flow as well as to comprehensively analyze gas-phase flow filed with the existing model and boundary conditions. Moreover, the Lagrange method of bidirectional coupling method is used to track particle trajectory. The influence of varied particle diameter, inlet particle concentration, and exhaust velocity on sparks out efficiency and pressure loss are discussed. The simulation results shows that the sparks out efficiency is increased with the increase of particle diameter, inlet particle concentration and exhaust velocity, and that influence of the particle diameter and exhaust velocity are especially obvious .