基于CFD仿真的柴油机中冷器流动均匀性优化

基于某船用柴油机1D热力学模型提供的计算边界条件,采用3D CFD对该柴油机匹配的中冷器的瞬态流动及换热过程进行仿真模拟,计算分析中冷器入口截面的速度均匀性以及前进气箱压力损失。结果表明:中冷器入口截面的速度均匀性系数未完全达到设计目标。对中冷器前进气箱的结构进行优化设计,优化后的中冷器入口截面的速度均匀性系数有所提高,满足设计要求,同时中冷器前进气箱的压力损失处于较低水平。

Optimization of Charge Air Cooler Flow Uniformity of Diesel EngineBased on CFD Simulation

With the boundary conditions calculated with a marine diesel engine 1D thermodynamic mo-del, the transient flow and heat exchange process of the charge air cooler matching the diesel engine was simulated with 3D CFD calculation. The velocity uniformity of the inlet section and the pressure loss of the inlet plenum were calculated. The results showed that the velocity uniformity coefficient at the inlet section of the charge air cooler had not reached the design objective. Based on the calculated results,the structure of the inlet plenum of the charge air cooler was optimized,which improved the velocity unifor-mity coefficient at the inlet section of the charge air cooler and met with the design requirements, and kept the pressure loss of the inlet plenum at low value as well.