Scavenge Ports Optimization of a 2-Stroke Opposed Piston Diesel Engine

Paper #:
  • 2017-24-0167

Published:
  • 2017-09-04
Abstract:
A CFD study on a 2-stroke (2-S) opposed piston high speed direct injection (HSDI) Diesel engine is reported in this work. The engine main features (bore, stroke, port timings, et cetera) were defined in a previous stage of the project, with the support of CFD-1D engine simulations and empirical hypotheses. The current analysis is focused on the assembly made up of scavenge ports, manifold and cylinder. The first step of the study consisted in the construction of a parametric mesh on a simplified geometry. Two geometric parameters and 3 different operating conditions were considered. A CFD-3D simulation by using a customized version of the KIVA-4 code was performed on a set of 243 different cases, sweeping all the most interesting combinations of geometric parameters and operating conditions. The post-processing of this huge amount of data allowed us to define the most effective geometric configuration, named baseline. In the second step of the study, the baseline was further optimized, keeping into account some fundamental design constraints, such as the overall dimensions of the manifold. The evolved geometry was then simulated by using KIVA, adopting a refined grid and realistic boundary conditions. The calculated scavenging patterns are presented and compared to the correspondent curves obtained for different cylinder geometries (loop scavenging, uniflow scavenging with exhaust poppet valves)
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