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Mechanical Analysis of Genoa 03 Stirling Engine

Journal of Sustainable Development of Energy, Water and Environment Systems
ARTICLE IN PRESS (volume, issue and page numbers will be assigned later)
DOI: (registered soon)
Miguel Torres García , David Sánchez Martínez, Francisco Aguilera Roldán, Francisco J. Jiménez-Espadafor Aguilar, Elisa Carvajal Trujillo
Higher Technical School of Engineering, Thermal Power Group – GMTS, University of Seville, Camino de los descubrimientos s/n, 41092 Sevilla, Spain

Due to the new technologies development based on renewable sources of energy, in recent years Stirling engines have become very important in the energetic sector. Many of them do not allow the use of fluid lubricants and, thus, the effect of friction losses is important. For this purpose, a mathematical model has been developed based on the force balance in the crankshaft using the pressure distribution in the cylinders. The aim of this work is to characterize the mechanical losses in a Genoa 03 Stirling engine using a numerical model and experimentally via the drag method. The results of this model have been compared with those obtained experimentally on Genoa 03 Stirling engine. In the experimental results, a proportional increase in friction torque due to the average pressure and the speed of the crankshaft is observed. The first of these is caused by an increase of dry friction forces and the second, by the viscous friction between the working fluid and the inner walls of the engine. Also in this paper, irreversible processes in a beta type Stirling engine have been investigated in order to highlight the impact of losses on mechanical power and its performance. This article develops the first study of the mechanical losses of Genoa 03 experimental Stirling engine, which has an output power of 3 kW. Although the model response follows the same trends as the experiments, those simplifications provide errors which become more significant as the engine speed increases.

Keywords: Stirling engine, Friction losses, Mechanical efficiency, Engine speed, Engine performance, Mechanical model, Experimental analysis.

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