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CFD-Based Optimization of a Diesel-fueled Free Piston Engine Prototype for Conventional and HCCI Combustion

Miriam Bergman (Institutionen för tillämpad mekanik, Förbränning) ; Jakob Fredriksson (Institutionen för tillämpad mekanik, Förbränning) ; Valeri Golovitchev (Institutionen för tillämpad mekanik, Förbränning)
SAE (2008)
[Artikel, refereegranskad vetenskaplig]

This paper presents results of a parametric CFD modeling study of a prototype Free Piston Engine (FPE), designed for application in a series hybrid electric vehicle. Since the piston motion is governed by Newton’s second law, accounting for the forces acting on the piston/translator, i.e. friction forces, electrical forces, and in-cylinder gas forces, having a high-level control system is vital. The control system changes the electrical force applied during the stroke, thus obtaining the desired compression ratio. Identical control algorithms were implemented in a MATLAB/SIMULINK model to those applied in the prototype engine. The ignition delay and heat release data used in the MATLAB/SIMULINK model are predicted by the KIVA-3V CFD code which incorporates detailed chemical kinetics (305 reactions among 70 species). Since the piston motion and frequency, the rate of heat release and the initial in-cylinder conditions all affect each other, while predicted using different modelling tools with no direct coupling between them, an iterative procedure was used among models describing: 1. Piston dynamics governed by Newton’s second law including a high-level control system (using MATLAB/SIMULINK) 2. Combustion processes (using KIVA-3V) 3. Intake and exhaust system dynamics (using the GT-POWER module of the GT-SUITETM) Effects of varying parameters such as compression ratios, power supplied to the compressor, fuel injection timings and injection pressures have been studied in both conventional diesel and HCCI modes, the target being to identify optimal conditions for the combustion process in which the engine can be operated highly efficiently with very low-emissions.

Denna post skapades 2008-06-10. Senast ändrad 2016-09-23.
CPL Pubid: 71585


Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Förbränning (2007-2017)


Övrig annan teknik

Chalmers infrastruktur