Optimum Stirling engine geometry

Optimum Stirling engine geometry

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Article ID: iaor20032870
Country: United States
Volume: 26
Issue: 12
Start Page Number: 1087
End Page Number: 1101
Publication Date: Oct 2002
Journal: International Journal of Energy Research
Authors:
Keywords: engineering
Abstract:

This paper combines the author's work on mechanical efficiency of reciprocating engines with the classic Schmidt thermodynamic model for Stirling engines and revisits the problem of identifying optimal engine geometry. All previous optimizations using the Schmidt theory focused on obtaining a maximal specific indicated cyclic work. This does not necessarily produce the highest shaft output. Indeed, some optima based upon indicated work would yield engines that cannot run at all due to excessive intrinsic mechanical losses. The analysis presented in this paper shows how to optimize for shaft or brake work output. Specifically, it presents solutions to the problem of finding the piston-to-displacer swept volume ratio and phase angle which will give the maximum brake output for a given total swept volume, given temperature extremes, a given mean operating pressure, and a given engine mechanism effectiveness. The paper covers the split-cylinder or gamma-type Sirling in detail, serving as a model for similar analysis of the other Stirling engine configurations.

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