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- Title
OPTIMAL PATHS OF PISTON MOTION OF IRREVERSIBLE DIESEL CYCLE FOR MINIMUM ENTROPY GENERATION.
- Authors
Yanlin Ge; Lingen Chen; Fengrui Sun
- Abstract
A Diesel cycle heat engine with internal and external irreversibilities of heat transfer and friction, in which the finite rate of combustion is considered and the heat transfer between the working fluid and the environment obeys Newton's heat transfer law ≈ D(T), is studied in this paper. Optimal piston motion trajectories for minimizing entropy generation per cycle are derived for the fixed total cycle time and fuel consumed per cycle. Optimal control theory is applied to determine the optimal piston motion trajectories for the cases of with piston acceleration constraint on each stroke and the optimal distribution of the total cycle time among the strokes. The optimal piston motion with acceleration constraint for each stroke consists of three segments, including initial maximum acceleration and final maximum deceleration boundary segments, respectively. Numerical ex-amples for optimal configurations are provided, and the results obtained are compared with those obtained when maximizing the work output with Newton's heat transfer law. The results also show that optimizing the piston motion trajec-tories could reduce engine entropy generation by more than 20%. This is primar-ily due to the decrease in entropy generation caused by heat transfer loss on the initial portion of the power stroke.
- Subjects
PISTONS; DIESEL cycle; ENTROPY; HEAT transfer; THERMODYNAMICS
- Publication
Thermal Science, 2011, Vol 15, Issue 4, p975
- ISSN
0354-9836
- Publication type
Article
- DOI
10.2298/TSCI110720100G