Abstract
This investigation presents results from numerical simulation of the air flow in Spark Ignition Engine (SI engine) cylinder. Accurate modeling of the flow in cylinder is a key part of successful combustion simulation. The most usual numerical method in Computational Fluid Dynamics (CFD) is finite volume. In this investigation an important, common fluid flow patterns in CFD simulations, namely, Tumble motion typical in automotive engines and RNG k-ε turbulence model were used. The air flow in a two-valve engine cylinder during 720 degree of crank angle was investigated by using a CFD code which is basis on finite volume and codes which were written in visual C++ environment. Dynamic Mesh and Moving Boundary capability were used for this model. The comparison results with previous researches results, Kiva-3v and PIV experimental, show good agreement.
Highlights
With the advent of more powerful computers, mathematical models are increasingly accepted as design and optimization tools for engine development
The use of Computational Fluid Dynamics (CFD) on engine development programs has enabled significant time and cost savings to be made in the design and development of engine combustion engine system
Accurate modeling of the flow in cylinder is a key part of successful combustion simulation
Summary
With the advent of more powerful computers, mathematical models are increasingly accepted as design and optimization tools for engine development. To accepting a mathematical tool for engine design, it is necessary to validate the model results by experimentation. In the flow within a cylinder, there are two types of motion: swirl flow commonly found in diesel engines and tumble flow commonly found in gas engines. In both cases, rotational motion occurs about an axis, though the position of the respective axis is different. In order to generate swirl or tumble motion, fluid enters the combustion chamber from the intake ports. A controlled flow motion is used to get stable and reproducible conditions at each engine cycle
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