A Complex Comparatrive Study of Two Dissimilar Engine Valve Constructions, for the In-Cylinder Flow Behaviour of a High Speed, IC Engine

Abstract

In our research we investigated the possibility of offering a viable alternative for internal combustion engines' poppet valves. After examining in-cylinder flow characterization methods, we derived a computer model of the base concept and a special swinging valve arrangement. The flow characterization of both arrangements has been completed using numerical fluid dynamics software. To minimize numerical errors different mesh scenarios were investigated and evaluated. From our research activity a clear picture has been drawn on the qualities of the proposed system. The swinging valve arrangement improves the efficiency of the gas exchange process. Also, the flow during the intake process is more structured and has less local vorticity. The results have also shown a very favourable charge movement pattern that is ideal for GDI engines. All of these findings produce an appropriate platform for a stratified charging, extra lean burning engine concept. The construction concept lends itself to be flawlessly integrated in a throttle-less engine control environment as well. With these qualities the new valve arrangement may be the ideal solution to produce fuel efficient, high specific output engines, for those transportation systems that will still need to rely on fossil fuels in the future.