| Summary: | 碩士 === 國立臺灣海洋大學 === 機械與輪機工程學系 === 92 === ABSTRACT
The diesel engine of two stroke is liked, but their shortcomings such as high pollution, and high consume fuel, which are industrial engineers and the academic community want to probe into the problem, then, how to design some movements that improve the mix of fuel and air, combustion efficiency, can’t go so far as to chew fuel up much, moreover, produce propulsive force with effect be had wanting to break through a topic for study in many years. This project applies the Flow-3D to investigate the influence of swirl and squish motion of the piston bowl on the turbulent flow in a motored engine. In this project, we use numerical analysis to model the turbulent flow field to solve the mass-weighted filtered governing equations involving continuity, momentum and energy equations. Furthermore, we will investigate the flow field in an engine cylinder.
This study investigates the effect of compression ratios, a position of piston and engine speeds (300 rpm) on the turbulent flow in the combustion chamber of a motored engine during compression and expansion strokes. Then we will analyze the interrelation between the squish flow and the swirl in the cylinder.
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