Computational Fluid Dynamics of Four Stroke In-Cylinder Charge Behavior at Distinct Valve Lift Opening Clearance in Spark Ignition Reciprocating Internal Combustion Renault Engine

Year 2024, Volume: 8 Issue: 1, 1 - 22, 31.03.2024

Aniekan Ikpe , Michael Bassey

https://doi.org/10.30939/ijastech..1337386

Cited By: 1

Abstract

Renault internal combustion engines have complex, expensive, and challenging experimentally computed in-cylinder flow dynamics. The current study employed computational fluid dynamics to simulate the in-cylinder charge behavior at various valve lift opening clearance in a four-stroke spark-ignition internal combustion engine. The governing equations for an unstable, three-dimensional and compressible turbulent flow were computed using the continuity equations (for mass conservation), Navier-Stokes equations (for momentum conservation), and RNG k- turbulence model. The engine was modelled using SolidWorks 2019 while the in-cylinder charge behavior was simulated using ANSYS Fluent 14.5 model. The thermal characteristics and parameters with respect to air-fuel mixtures were observed to improve with higher temperature (with respect to the cylinder) during combustion. The volumetric and mechanical efficiency of the cycle significantly improved as a result of the increased valve lift opening clearance, which caused more charge to be ingested into the cylinder. Additionally, it was found that at lower valve lift, which may be characterized by minimal or zero losses, the rate of heat retention in the cylinder was at its peak, but very high cylinder charge temperatures was predisposed to a decrease in the intake charge density. From the Particle Image Velocimetry (PIV) obtained in this study, increasing valve lift opening clearance led to increase in-cylinder velocity vectors, vorticity magnitudes, and distributions of turbulence kinetic energy (TKE), which signified improvement in combustion efficiency, increased torque and power output for efficient engine performance.

Keywords

In-cylinder temperature, Velocity vectors, Mechanical efficiency, Valve lift clerance, IC engine, TKE

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