Lista zgłoszonych artykułów

The power and overall efficiency of two-stroke engines are strongly dependent by scavenging efficiency, thus optimization of this process is vital to performance. The main aim of this article is to show the potential of combining different engineering tools to substantially speed-up the conception verification phase of various scavenging systems. A short review of scavenging methods were made. It was indicated that the uniflow system has the greatest potential in the two-stroke engines and it is a natural decision when concerning an opposite-piston engine. The authors demonstrate that there is a growing interest in opposed-piston and cite the biggest advantages of such constructions, paying particular attention to the thermodynamic profits. Main part of the article presents an author’s time-effective method of testing a various conceptions qualitatively. In traditional CFD approach model preparation and meshing takes a significant part of design phase time. The algorithm uses a variety of programming languages to interconnect commercial (in this case Ansys Workbench, NX, Matlab, Microsoft Excel) and non-commercial packages (Cantera) to get the most important information as soon as they are available. Presented tools cover 0-D combustion (with desired exhaust gases concentration), geometry division and meshing, automated solver-setting and numerical-data postprocessor, prepared especially for piston ported valves. A simple evaluation of time savings was conducted. Last part is a critical sum-up of presented method and pointing out some interesting directions of development, concerning co-simulation with 1D software and more sophisticated combustion modeling.