Compression ratio of an optimized air standard Otto-cycle model
- 1 January 1994
- journal article
- Published by IOP Publishing in European Journal of Physics
- Vol. 15 (1), 38-42
- https://doi.org/10.1088/0143-0807/15/1/007
Abstract
We propose an irreversible simplified model for the air standard Otto thermal cycle. This model takes into account the finite-time evolution of the cycle's compression and power strokes and it considers global losses lumped in a friction like term. The proposed model permits the maximization of quantities such as the power output and the efficiency in terms of the compression ratio r. The optimum r values obtained compare well with standard r values for real Otto engines. Our model leads to loop-shaped power-versus-efficiency curves as is common to almost all real heat engines.This publication has 8 references indexed in Scilit:
- General performance characteristics of real heat enginesJournal of Applied Physics, 1992
- An ecological optimization criterion for finite-time heat enginesJournal of Applied Physics, 1991
- Thermal efficiency at maximum work output: New results for old heat enginesAmerican Journal of Physics, 1987
- Thermodynamics in finite timePhysics Today, 1984
- Optimal paths for thermodynamic systems: The ideal Otto cycleJournal of Applied Physics, 1982
- Finite-time thermodynamics: Engine performance improved by optimized piston motionProceedings of the National Academy of Sciences of the United States of America, 1981
- Optimal configuration of a class of irreversible heat engines. IPhysical Review A, 1979
- Efficiency of a Carnot engine at maximum power outputAmerican Journal of Physics, 1975