Date of Award


Publication Type

Master Thesis

Degree Name



Mechanical, Automotive, and Materials Engineering

First Advisor

Ming Zheng

Second Advisor

Graham T. Reader




The flow reversal strategy is categorized as one type of the active flow control strategies. Previous research results have shown that the reaction heat of the catalysts in the aftertreatment system can be trapped by the flow reversal strategy, which is beneficial for the enhancement of the conversion efficiency of the aftertreatment system. In order to better understand the operational principle of the flow reversal system, an active flow aftertreatment system that employs flow reversal strategy has been developed in the Clean Combustion Engine Lab at the University of Windsor. The main objective of this study is to investigate the heat retention ability of the flow reversal system. In order to make the flow reversal unit work efficiently, the appropriate operational parameters are identified first under a constant inlet gas temperature condition. A comparative study is then conducted to investigate the heat retention capability of both unidirectional and reversal flow during a DOC catalyst cooling down process. Additionally, this thesis also compiles detailed documentation of the flow reversal platform setup and its working principle, which is a valuable research tool to conduct more studies on the active flow control strategies in aftertreatment.