Investigations on the temperature distribution of the diesel particulate filter in the thermal regeneration process and its field synergy analysis
Investigations on the temperature distribution of the diesel particulate filter in the thermal regeneration process and its field synergy analysis
复制标题
柴油机颗粒过滤器热再生过程温度分布研究及现场协同分析
DOI：
10.1016/j.applthermaleng.2017.05.072
复制
发表时间：
2017-08-01
影响因子：
6.4
通讯作者：
Han, Dandan
中科院分区：
文献类型：
--
作者：
Deng, Yuanwang;Cui, Jinhui;Han, Dandan
为了提高柴油机微粒捕集器（DPF）温度分布的合理性，建立了DPF热再生模型，研究了DPF热再生过程中的温度分布，模拟了DPF内部温度和通道内温度梯度。利用场协同理论，根据速度矢量与温度梯度的协同程度，对DPF热再生过程中的温度分布进行了优化。结果表明：热再生过程中排气质量流量的增加会导致温度值沿轴向从过滤段到沿着收缩段逐渐升高，径向温度梯度的峰值出现在过滤段和收缩段的前方，且最大值先减小后增大，而轴向温度梯度的峰值出现在过滤段的前部。当排气质量流量为20-30 g/s时，径向温度梯度峰值存在一个最佳流动区域，轴向温度梯度峰值将逐渐降低。颗粒负荷小于5g/L可以避免熔体破坏和热应力损伤。(C)2017爱思唯尔有限公司版权所有
In order to enhance the reasonableness of temperature distribution of the diesel particulate filter (DPF), a thermal regeneration model of the DPF is developed to investigate the temperature distribution of the diesel particulate filter in the thermal regeneration process, and the internal temperature and temperature gradient in channels are simulated. Moreover, field synergy theory is used to optimize temperature distribution of the DPF in the thermal regeneration process due to synergy degree between velocity vector and temperature gradient. The results reveal that increase of the exhaust mass flow in the thermal regeneration process will lead to the increase of temperature value from the filter section to the contraction section of along the axial direction, the peak of the radial temperature gradient will appear in the front of the filter section and contraction section, and the maximum value will first decrease and then increase, but the peak of axial temperature gradient will appear in the front of the filter section. When the exhaust mass flow is about 20-30 g/s, there is an optimum flow area for the peak of radial temperature gradient, and the peak of axial temperature gradient will decrease gradually. Moreover, particle load which is less than 5 g/L can avoid the melt failure and the thermal stress damage. (C) 2017 Elsevier Ltd. All rights reserved.