射流式EGR装置关键参数对最大可实现EGR率的影响研究

发布时间：2018-06-23 01:21

本文选题：废气再循环 + 结构参数　；参考：《机械设计与制造》2016年10期

【摘要】：为解决柴油机小负荷工况下废气再循环(EGR)实现困难等问题,对增压柴油机上基于文丘里原理的射流式低压EGR装置进行了数值计算,分析了装置结构参数以及边界条件对装置最大可实现EGR率(EGRmax)的影响。计算结果表明:装置的EGRmax对收缩段宽度与空气进口直径更为敏感;废气入口处与出口处压力差越小,装置实现EGR则越困难。最终得到EGR装置结构设计原则:适当减小收缩段宽度与空气进口直径,增大废气入口与出口压力差值,同时避免较小的收缩段宽度与较大的空气进口直径增加装置的总压损失。
[Abstract]:In order to solve the problem that EGR is difficult to realize under low load condition of diesel engine, the numerical calculation of the jet low pressure EGR device based on Venturi principle on turbocharged diesel engine is carried out. The effects of device structure parameters and boundary conditions on the maximum realizable EGR rate (EGRmax) of the device are analyzed. The calculated results show that the EGRmax of the device is more sensitive to the width of the contraction section and the diameter of the air inlet, and the smaller the pressure difference between the inlet and the outlet of the exhaust gas, the more difficult it is for the device to realize EGR. Finally, the structure design principle of EGR device is obtained: reducing the width of contraction section and the diameter of air inlet, increasing the difference between inlet and outlet pressure of exhaust gas, and avoiding the total pressure loss of the device with smaller width of contraction section and larger diameter of air inlet.
【作者单位】：西华大学汽车与交通学院;
【基金】：废气再循环中冷器积碳过程评价研究(SZJJ2014-064) 四川省教育厅项目(14ZB0128) 西华大学研究生创新基金项目(YCJJ2014093);西华大学研究生创新基金项目(YCJJ2014155)
【分类号】：TK423

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