Numerical Analysis of the Performances of a Small Two-Stroke Engine with Direct Injection

Abstract

<div class="htmlview paragraph">World-wide attention to environmental issues in recent years has resulted in a greater demand for cleaner engines, especially with regards to the two-stroke. Considering the techniques for reduction of exhaust emissions the direct injection of fuel into the combustion chamber adapted for a loop scavenged cylinder seems to be an advantageous method.</div> <div class="htmlview paragraph">This paper describes the application of advanced experimental and computational techniques to evaluate mixture formation produced on a commercial engine by means of a direct fuel injection strategy, namely a ram-tuned injection system. The injection system data are experimental while air flow and fuel air mix for the direct injection engine are calculated using a turbulent model of the three dimensional code FLUENT.</div> <div class="htmlview paragraph">Extension of a first work in this field is presented.</div> <div class="htmlview paragraph">In particular two possible strategies to simulate direct injection are tested. The influence of different boundary conditions on the scavenging process was examined too.</div> <div class="htmlview paragraph">A time dependent simulation strategy considering the moving piston is the final step of the work.</div>