Vortex formation in a rapid compression machine: Influence of physical and operating parameters

► Vortex suppression over the entire range of RCM operation is very important. ► Vortex is exacerbated at low pressures, long stroke lengths and small clearance. ► Both, boundary layer thickness and flow field, influence temperature homogeneity. ► The operating regime of an RCM, that is free from the roll-up vortex, is delineated.