A Mathematical Model for Ringbom Engine Operation

[+] Author and Article Information
J. R. Senft

University of Wisconsin—River Falls, River Falls, WI 54022

J. Eng. Gas Turbines Power 107(3), 590-595 (Jul 01, 1985) (6 pages) doi:10.1115/1.3239777 History: Received December 01, 1982; Online October 15, 2009


The Ringbom or hybrid Stirling engine, essentially dormant for some 70 years, is experiencing a vigorous rebirth following recent fundamental discoveries concerning its unique mode of operation. In this paper the author’s earlier mathematical model of Ringbom engine operation is extended to include volume variation effects due to the displacer rod. This injects a new parameter, the rod-to-displacer area ratio, into the theory improving its fidelity and increasing its predictive power. It is rigorously shown that the main theorem characterizing overdriven mode operation, the basic regime of stable running for hybrids, remains valid in the extended model and is presented here in a new form.

Copyright © 1985 by ASME
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