Experiment for influence of flow parameters on DOC performance
1. Key Laboratory of Fluid and Power Machinery, Xihua University, Chengdu, Sichuan 610039, China; 2. Sichuan Collaborative Innovation Center for Automotive Key Components, School of Automotive and Transportation Engineering, Xihua University, Chengdu, Sichuan 610039, China
Abstract： Based on the diesel engine bench，the effects of flow parameters on DOC performance were investigated by changing flow temperature or gas hourly space velocity (GHSV). The results show that the pressure drop is linearly increased with the increasing of flow temperature, and the higher the GHSV is, the greater the growth rate is. The characteristic of DOC temperature rise is not obvious in the normal operation of engine, and the outlet temperature change is affected by GHSV and flow temperature. The characteristic of DOC fuel ignition is affected by the flow temperature in exhaust pipe fuel injection, and the higher the temperature is, the less the THC leaks. DOC can significantly reduce the emission of CO and THC, and the conversion efficiency is increased first with latter tending to be gentle with the increasing of flow temperature. The ability of oxidizing NO to NO2 by DOC is strong, and the ( the volume fraction of NO2 in NOx) is increased first with latter decreasing with the increasing of flow temperature, and the maximum value of appears in the DOC at around 350 ℃.
2019, Vol. 40 
