发动机排气热能回收装置壳程侧流场的数值模拟分析

Numerical simulation analysis on the shell of engine exhaust energy reclaim equipment

应用FLUENT软件对排气热能热交换器壳程侧流场进行数值模拟,采用GAMBIT网格生成技术建立物理模型,在FLUENT中采用合适的计算模型、差分格式及边界条件,对计算结果进行后处理分析.计算结果表明:排气在壳程的入口速度越大,对管程冲刷越强烈,排气的湍流度也越大,换热效果也就越好;压差随着排气速度的增加而增加,流速越大排气温差越小,换热效果越好.

FLUENT software was used to numerically simulate the shell side of the reclaiming equipment of engine exhaust energy structure,the GAMBIT grid generation technique is used to establish a physical model.Adopting appropriate calculation model,the results are obained from the difference scheme and boundary conditions in FLUENT.After treatment shell is exhausted in the entrance of the tube scouring velocity of turbulent degrees,and the heat exchange efficiency is better,when differential pressure with exhaust velocity increases,the temperature of the exhaust velocity is smaller,so the heat exchange efficiency is better.