Abstract
The paper describes the initiation of the ignition of the CNG mixtures by spark plug and formation of the flame during the combustion. The propagation of the flame depends on the gas motion formed during induction and compression process in SI engines. Two modes of the charge motion are considered: swirl and tumble with the spark plug located in the centre of the combustion chamber and results will be compared with laminar speed. The modelling of the process was carried out by use the simple chemically reacting scheme by use Phoenics CFD code with taking into account the turbulence k-ε model. The charge motion through the spark plug was considered as an important factor influencing on the ignition of any kind of fuel mixture.
