Influence of swirl, tumble and squish flows on combustion characteristics and emissions in internal combustion enginereview
Influence of swirl, tumble and squish flows on combustion characteristics and emissions in internal combustion enginereview
This study gives an overview of available literature on flow patterns such asswirl, tumble and squish in internal combustion engines and their impacts ofturbulence enhancement, combustion efficiency and emission reduction.Characteristics of in-cylinder flows are summarized. Different designapproaches to generate these flows such as directed ports, helical ports, valveshrouding and masking, modifying piston surface, flow blockages and vanesare described. How turbulence produced by swirl, tumble and squish flowsare discussed. Effects of the organized flows on combustion parameters andexhaust emission are outlined. This review reveals that the recentinvestigations on the swirl, tumble and squish flows are generally related toimproving in-cylinder turbulence. Thus, more experimental and numericalstudies including the impacts of this organized flows on turbulenceproduction, combustion behavior and pollutant formation inside the cylinderare needed.
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