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Optimization of Exhaust Gas Recirculation System

机译：优化废气再循环系统

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Exhaust Gas Recirculation (EGR) is a method to control Nitrogen Oxide (NO_x) emissions from automobile exhaust. In this method, small amount of the exhaust gas is recirculated into the combustion chamber through the air intake system. The exhaust gas is mixed with charge air just before entering intake manifold. Appropriate mixing of exhaust gas with charge air is necessary to ensure nearly equal amount of exhaust gas flow into all the cylinders. Present research efforts by various automobile manufacturers rely on commercial CFD simulation tools to identify and resolve flow and thermal issues occurring in various vehicle systems. The focus of this paper is to optimize the EGR system to obtain uniform distribution of recirculated exhaust gas to every cylinder of a six cylinder heavy duty diesel engine. CFD simulations were done for this engine using a commercial CFD solver. Mixing and transport of the two fluids was modeled using species transport approach. Appropriate geometric modifications were proposed based on simulation results.
机译：废气再循环（EGR）是一种从汽车排气中控制氮氧化物（NO_X）排放的方法。在该方法中，通过进气系统将少量的废气再循环到燃烧室中。在进入进气歧管之前，废气与充电空气混合。需要使用充电空气的适当混合，以确保将几乎相同的废气流入所有气缸。目前各种汽车制造商依赖于商业CFD仿真工具的研究努力，以识别和解决各种车辆系统中发生的流量和热问题。本文的焦点是优化EGR系统，以获得六个气缸重型柴油发动机的每个汽缸的再循环废气的均匀分布。使用商业CFD求解器为此发动机进行了CFD仿真。使用物种运输方法模拟两种流体的混合和运输。基于仿真结果提出了适当的几何修改。

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