柴油机后处理器消声性能分析

Analysis of Noise Elimination Performance of Diesel Engine After-Treatment

应用一维热力学分析软件对某柴油机组合式后处理系统进行建模仿真,基于仿真分析结果并根据相关消声知识对组合后处理系统结构进行优化改进。分析改进后的消声性能,计算相关传递损失和插入损失。结果表明:改进后传递损失在大部分频谱范围内均有明显上升,上升范围为6~20dB;插入损失由28.01dB提高到28.5dB,提高1.75%;排气背压差为由24kPa降低到16kPa,降低33.33%。消声性能提高,压力损失降低,发动机实际工作性能得到提高。

Using certain one dimensional simulation software, the combined aftertreatment system of a diesel engine was modeled and simulated, the aftertreatement system structure was optimized according to simulation result and related principles of noise reduction. Noise reduction effect after optimization was analyzed, related transmission loss and insertion loss were calculated. Result shows that transmission loss increased significantly in the greater frequency spectrum by 6~20 dB;insertion loss increased from 28.01 dB to 28.5dB, increased by 1.75%;emission back pressure decreased from 24kPa to 16kPa, decreased by 33.33%. With better muffling performance while decreasing pressure loss, the actual engine performance is improved.