Combustion in a spark-ignition engine is affected by the
complicated gas movement.
It is difficult to analyze such combustion process. However, the
combustion modeling is very useful for the analysis of the
combustion process.
For this purpose, we made use of the entrainment model and
expressed the turbulent flame velocity as a function of laminar
flame velocity, simplified combustion-chamber shape and inlet flow
velocity.
As the results of this paper, we found that the predicted rate
of mass burned by this method is similar to the value obtained by
the analysis of the indicator diagram. The turbulent flame velocity
was found to be affected greatly by the engine speed and the
combustion chamber shape.
The flame factor which is the characteristic constant of the
experimental engine, can be determined by the variables such as
laminar flame velocity, engine speed and combustion chamber shape.
The relation of flame factor with each of these variables is
closely examined in this paper.