نویسندگان
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
A computational optimization was performed for a direct-injection diesel engine using three-dimensional
modeling. Fully transient CFD analyses of different valve profile strategies for the intake and compression
strokes were performed to evaluate the effects on both engine performance and in-cylinder flow-field evolution.
The turbulence model was used along with the second order linear upwind scheme. Modifications
were applied to intake valve for five different valve lift profiles. Organized flow structures (i.e., swirl) and
turbulent flow patterns were investigated in order to address the rules for ad-hoc strategies aiming at finding
the best trade-off between the engine performance and pollutant emission. At first, results for the base
case were validated against experiments at maximum power operation (2000 rpm) subsequently, four valve
lift profiles, were performed. Relative valve profiles were proved to influence the flow field within the combustion
chamber, and, therefore, the subsequent spray evolution and fuel combustion which confirmed the
importance of an ad-hoc optimization.
کلیدواژهها [English]
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