Operational maps for crankshaft-equipped miniature homogeneous charge compression ignition engines are established using performance estimation, detailed chemical kinetics, and diffusion models for heat transfer and radical loss. In this study, radical loss was found to be insignificant. In contrast, heat transfer was found to be increasingly significant for 10, 1, and 0.1. W engines, respectively. Also, temperature-pressure trajectories and ignition delay time maps are used to explore relationships between engine operational parameters and HCCI. Lastly, effects of engine operating conditions and design on the indicated fuel conversion efficiency are investigated.
Bibliographical noteFunding Information:
This project was sponsored by Honeywell International under DARPA contract no. F30602-99-C-0200. The authors would also like to acknowledge the support of the Minnesota Supercomputing Institute.
Copyright 2015 Elsevier B.V., All rights reserved.
- Free-piston engine.
- Homogeneous charge compression ignition combustion.
- Kinetic modeling.
- Micro-power generation.