Experimental and Numerical Study of Admission and Exhaust Flows in a Spark Ignition Engine

International audienceThe yield of the process of gas exchange in four stroke internal combustion engines is given by volumetric efficiency, which depends on the dynamics of gases in the exhaust and intake manifolds. These gases are considered as compressible and ideal and the laws of conservation of mass, momentum and energy, 1D-transient, are applied. The numerical results are compared with time resolved measurements performed on a spark ignition single-cylinder engine. For the comparison, pressure in the combustion chamber, pressure of the gas at different locations along the pipelines and wall temperature of intake and exhaust ducts are considered. In order to validate the simulation in a large range of conditions, different engine speeds and lengths of intake and exhaust ducts have been investigated