Investigation of H2 Formation Characterization and its Contribution to Post- Oxidation Phenomenon in a Turbocharged DISI Engine

Analysis of Post-oxidation Phenomena in a Turbocharged DISI Engine Focused on Gas and PM Emissions and Gas Temperature

“…In the post-oxidation phenomena, the main source of heat generation is CO oxidation. The oxidation process of CO is represented as below [2], 𝐶𝑂 + 𝑂𝐻 = 𝐶𝑂 2 + 𝐻 (I) while the reaction equations…”

“…The wider investigation on the emissions such as, CO, CO2, THC, PM and H2 have been also performed in the post-oxidation phenomena and found emissions reduction along with the turboperformance improvement [1,2,3,7]. It was also noted that the efficient post-oxidation can be influenced with adequate mixing, temperature level and air and exhaust gas concentration in the exhaust manifold [7,8].…”

“…The in-cylinder combustion used rich air-fuel mixture and this rich excursion gives rise to the production of CO, THC, PM and H2 emissions. Then the scavenged O2 and emitted H2 play a key role for post-oxidation reaction with CO, THC and PM in exhaust manifold and in-turn can aid in increasing the temperature along with overcomming of decrease in temperature by heat absorption reaction [1][2][3][4][5]. Apart from this, TWC life time improvement and load reduction on catalyst, reduction in residual gas fraction, and knocking tendency reduction by the in-cylinder temperature decrease etc.…”

Post-oxidation phenomena enhancement with scavenging and secondary air injection in exhaust manifold of a turbocharged GDI engine

“…4,5,9,10 Several kinds of simulative and experimental research have been conducted on the scavenging (VVT tuning) based post-oxidation phenomena. [1][2][3][4][5][6][7]9,11,12 Guenther et al performed a simulative study on the scavenging-based post-oxidation phenomena. The reaction kinetics mechanism including CO and H 2 was investigated and found that the H 2 shows the key element for the fast reaction.…”

Performance improvement of turbocharged SI engine by post-oxidation enhancement in exhaust gas in-homogeneity

“…This content of air does not react in the main combustion reaction inside the cylinder, rather it reacts in the exhaust manifold to promote post-oxidation reaction to take place. 1,2,13 Usually, to carry out such process, turbocharged engines are employed in common practice as in them, the intake pressure is high which aids in the scavenging process to take place. From above, it is apparent that scavenging and VVT tuning are the prerequisites for the post-oxidation reaction to take place in turbo-charged engines.…”