Numerical simulation of fuel-air mixture ignition in a v-type spark ignition engine and improvement of spark plug placement

In this paper, numerical simulation of ignition of fuel-air mixture in a cylinder of a v-type engine has been done by the method of computational fluid dynamics and premixed mixture. The premixed mixture consists of iso-octane and air with an equivalence ratio of 0.9. The existing simulation is performed using the finite volume method and combustion of the premixed mixture. Besides, the dynamic mesh in the piston motion is also used. In this regard, the trend of temperature and pressure changes with respect to the crank angle has been investigated. In order to validate, the results obtained by mixed mixture method were compared to that of a research engine. The simulation results show maximum error of only 2.2% when compared to the experimental results. Therefore, the proposed numerical method can be used in the design of spark ignition engines. In order to optimize the combustion and better spreading the flame front in the pent-roof type combustion chamber, the location of the spark plug has been investigated with several simulations at different spark locations. According to the data of pressure and temperature and either flame front contours and their comparison in different analyzes, the optimal range was achieved.