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Underwater striling engine design with modified one-dimensional model

  • Li, Daijin (School of Marine Science and Technology, Northwestern Polytechnical University) ;
  • Qin, Kan (School of Mechanical and Mining Engineering, University of Queensland) ;
  • Luo, Kai (School of Marine Science and Technology, Northwestern Polytechnical University)
  • Received : 2014.09.09
  • Accepted : 2015.03.24
  • Published : 2015.05.31

Abstract

Stirling engines are regarded as an efficient and promising power system for underwater devices. Currently, many researches on one-dimensional model is used to evaluate thermodynamic performance of Stirling engine, but in which there are still some aspects which cannot be modeled with proper mathematical models such as mechanical loss or auxiliary power. In this paper, a four-cylinder double-acting Stirling engine for Unmanned Underwater Vehicles (UUVs) is discussed. And a one-dimensional model incorporated with empirical equations of mechanical loss and auxiliary power obtained from experiments is derived while referring to the Stirling engine computer model of National Aeronautics and Space Administration (NASA). The P-40 Stirling engine with sufficient testing results from NASA is utilized to validate the accuracy of this one-dimensional model. It shows that the maximum error of output power of theoretical analysis results is less than 18% over testing results, and the maximum error of input power is no more than 9%. Finally, a Stirling engine for UUVs is designed with Schmidt analysis method and the modified one-dimensional model, and the results indicate this designed engine is capable of showing desired output power.

Keywords

References

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