IN-CYLINDER SIMULATION OF SPARK IGNITION ENGINE USING HEPTANE AS FUEL
The suction and compression strokes of internal combustion engine, such as spark ignition engine (SIE) or compression ignition engine (CIE) are influenced by the amount of air or fuel intake and the degree of mixing in the cylinder. While On the other hand, the power and exhaust strokes are known to influence the rate and flame propagation of combustion. The objective of this study is to perform in-cylinder simulation of injection in spark ignition engine (SIE) in order to determine the variation of particle traces, fuel mole fraction and velocity from inlet port to the cylinder. This is achieved by the use of CFD software to analyze and solve Continuity, Navier-Stokes and Energy equations governing the working medium. Ansys Design-Modeller was used to generate model mesh from model designed from Solidworks.
Study results revealed velocity of injected fuel to be maximum at inner region of valve face and the heptane used as fuel more concentrated near cylinder wall as it enters the cylinder. The mole fraction concentration was high at the center of the cylinder at the end of the final crank angle, while maximum velocity of fuel occurred near cylinder as crank angle increases.
Keywords: in-cylinder, injection, valves, simulation, velocity, pressure.