Effects of different combustion chamber geometries on turbulent flame speed

Vehicles which are produced conventional internal combustion engine (ICE) are important for making transportations fast and safety. However the new alternatives assert such as hybrid engines or plug-in electric motors, ICE leads to automotive, aviation and marine industry. But at the same time, it keeps up development. Especially, keeping clean the environment and getting high performance are the most challenging area for ICE. The more challenging requirements are developed such as more restriction of emission regulation and driver request on performance. Therefore ICE combustion process is needed to investigate. Flame propagation is as important as chemical reaction in the combustion. Not only academicians but also automotive industries work on to find new solutions for flame propagation phenomena. More than 70 year, studies have proceeded and there is not found a certain result about turbulence phenomena. Different type of methods are used to analyze turbulent flame characteristic. One of them is flame photography method. Flame propagation geometry is taken picture while burned fuel – air mixture is expanding. The data which is turbulent fluctuation, the size of eddy, the shape of flame can be measured with the help of this method. Also turbulent flame speed can be calculated using the measured characteristic of turbulent data. Another method to investigate turbulent flame propagation is the rising pressure measurement. The burned mass fraction is assumed to equal rising pressure fraction. According to this approach, turbulent flame speed can be calculated. In this study, turbulent flame propagation was studied as the effect of pressure rise in the single cylinder gasoline engine with different type of combustion chamber geometry. The effect of combustion chamber geometry on the turbulent flame was compared. Also experiments were performed at different compression ratios and influence of the compression ratio on the turbulent flame propagation was studied. Stoichiometric and lean mixture combustion on the turbulence was investigated, too.