Abstract: Background and Objective: The gas hydrothermal behaviour is strongly influencing the engine performance. The flow behaviour may be modified through the unavoidable installation of a flow restrictions and modifiers into the intake and exhaust systems and consequently the engine performance is adversely altered. The objective of this study was to perform a numerical modeling and analysis to predict the flow characteristics in the inlet and exhaust manifolds of a four-stroke single cylinder gasoline internal combustion engine. Materials and Methods: The flow at the intake and exhaust was simulated using ANSYS FLUENT employing boundary conditions at valves timing at critical points of opening and closing. A user define function has been coded to relate the valves and piston motions to generate the moving mesh inside the cylinder. Results: The results demonstrated some reversal flow cases, at certain positions of the valves. At crank angle around 570o the flow was reversed from the cylinder to the manifold, while at crank angle of around 370o, the flow was reversed from the manifold to the cylinder. Conclusion: The results obtained from the simulation code be used as guide to improve the understanding of the hydrothermal behaviour of the fluids in the manifolds and might be utilized to improve the manifold design.
Hussain H. Al-Kayiem, Hasanain A. Abdul Wahhab and A. Rashid A. Aziz, 2017. Computational Analysis of Flow Characteristic in Inlet and Exhaust Manifolds of Single Cylinder Spark Ignition Engine. Asian Journal of Applied Sciences, 10: 102-115.