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为了改善载体内速度分布,同时减小催化器内的压力损失,建立了基于一种新型导流装置的催化器内部流动的数学模型,并对其流场进行了二维稳态数值模拟。根据仿真结果,分析影响载体内流动特性的主要因素,为导流装置的改进确定方案。具体研究了导流装置结构参数d1:d2的改变对流动特性的影响,分析了速度分布和压力损失的变化规律,得出了一种较优的结构。加装导流装置后,流动在进入扩张管时提前分流,从而使载体前端流速分布更均匀,提高了载体的通过能力,减小了排气背压。
In order to improve the speed distribution in the carrier and reduce the pressure loss in the catalyst, a mathematical model of the internal flow of the catalyst based on a new type of flow guiding device is established. The two-dimensional steady state numerical simulation of the flow field is carried out. According to the simulation results, the main factors influencing the flow characteristics in the carrier are analyzed, and the improved scheme of the diversion device is analyzed. The influence of the structural parameters d1: d2 on the flow characteristics of the deflector was studied in detail. The variation of velocity distribution and pressure loss was analyzed and a better structure was obtained. After the installation of the guide device, the flow diversion ahead of time into the dilatation tube, so that the front-end flow velocity distribution of the carrier more uniform, improve the carrier through capacity and reduce exhaust back pressure.