Demonstrating ring pack operation in an operating engine is very difficult, yet
it is essential to optimize engine performance parameters such as blow-by, oil
consumption, emissions, and wear. A significant amount of power is lost in
friction between piston ring–cylinder liner interfaces if ring pack parameters
are not optimized properly. Thus, along with these parameters, it is also
necessary to reduce friction power loss in modern internal combustion engines as
the oil film thickness formed between the piston ring and liner is vital for
power loss reduction due to friction. Hence, it has also been a topic of
research interest for decades. Piston and ring dynamics simulation software are
used extensively for a better ring pack design. In this research work, a similar
software for piston ring dynamics simulation reviews the ring pack performance
of a four-cylinder diesel engine. Each piston ring performance is reviewed by
studying gas pressure at lands, ting position in the groove, oil film thickness,
ring friction, ring twisting, and ring pack blow-by trend. As per the ring pack
study, the top ring is experiencing ring collapse for some crank angle duration
while the second ring is experiencing ring fluttering and reverse blow-by for
some crank angle durations. This behavior has caused fluctuation in blow-by.
Also, in the end, the oil consumption and blow-by measurements are done on the
actual engine and compared with simulation results.
