Abstract
KEYWORDS – High tumble intake port, Tumble core, TCCM, Combustion CFD analysis
ABSTRACT –
Many kinds of engine have been introduced to improve engine performance and fuel consumption efficiency. Nowadays a downsized engine is popular for a gasoline engine because it can reduce the weight of engine by providing same amount of air to the cylinder with small displacement using turbocharger. It becomes even more critical to make an optimized fuel air mixture in a combustion chamber because it is fundamental for the improved combustion efficiency. The objective of this study is to develop a methodology to optimize a tumble flow in a combustion chamber.
CMCV (Charge Motion Control Valve) can be installed to the intake manifold and the intake port for a high tumble flow, but it requires higher cost and also causes higher flow restriction. In this study TCCM (Tumble Core Control Methodology) was applied to develop a high tumble intake port. TCCM is a technology to control the tumble core and generate an ideal tumble flow in a combustion chamber. The ideal tumble flow is essential to make a strong turbulent kinetic energy near the spark plug as well as a homogeneous mixture to warrant a fast flame propagation speed and a stable combustion. CFD analysis was implemented to predict a mixing and combustion efficiency through homogeneity, kinetic energy, and burn duration. Finally CFD result was validated through comparison with the dyno test result.