engleski

Influence of the compression ratio on Stirling and Otto cycle

The Stirling engine (1815) is more than half a century older from the Otto engine (1867). Nevertheless, in spite of the considerably longer development period, compression ratio of Stirling engines remains nearly the same as it was in its very beginning. As a contrast to this, compression ratio of Otto engines progressively increases, always reaching higher and higher power. Finally, modern Otto engines are considerably stronger than contemporary Stirling engines of the same size. However, by means of thermodynamical analysis of the old indicator diagrams, the rate of growth could be mathematically expressed in the shape of polytropic equation. In such a way the proper direction for a significant improvement of the Stirling engine could be recognized.

Stirling engine; thermodynamics; compression ratio

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