Abstract
Consider a free-piston engine of the type shown in Figure 1.12 and again in Figure 2.1. It consists essentially of three components, a heavy piston, a lightweight displacer and a cylinder sealed at the top end and which may be open or closed at the bottom. A displacer rod of appreciable diameter passes through the piston. The displacer and displacer rod are hollow thin wall shells. They may be open at the lower end so their interior is in fact part of the ‘bounce space’, the part of the cylinder below the piston. Alternatively, they may be closed and may or may not be provided with a small orifice to allow the interior to be charged to the mean cycle pressure. The ‘working space’ is above the piston and is divided into, a) the compression space above the piston and below the displacer, and b) the expansion space above the displacer. There is a long, thin annulus between the displacer and cylinder wall and this serves as the regenerative heat exchanger for working fluid passing between the hot expansion space and the cold compression space. Some form of heating is provided for the expansion space and some form of cooling in the compression space.
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Walker, G., Senft, J.R. (1985). Free-Piston Stirling Engines. In: Free Piston Stirling Engines. Lecture Notes in Engineering, vol 12. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-82526-2_2
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