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Optimization of a dual free piston Stirling engine |
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| Affiliation: | 1. David Reay & Associates, PO Box 25, Whitley Bay, Tyne & Wear NE26 1QT, UK.;2. Department of Mechanical, University of Illinois at Chicago, 842 West Taylor Street, Chicago, IL 60607-7022;3. Universitá Tor Vergata Roma, Italy;4. Universitá di Pisa, Italy;5. University of Minnesota, United States.;1. Key Laboratory of Space Energy Conversion Technology, Technical Institute of Physics and Chemistry, CAS, Beijing, 100190, China;2. University of Chinese Academy of Science, Beijing, 100190, China;1. Key Laboratory of Space Energy Conversion Technology, Technical Institute of Physics and Chemistry, CAS, Beijing 100190, China;2. University of Chinese Academy of Science, Beijing 100190, China;1. Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049 PR China;2. Key Laboratory of Vacuum Technology and Physics, Lanzhou Institute of Physics, Lanzhou, Gansu 730000 PR China |
| Abstract: | This work relates the theoretical study of the dynamic behavior of a dual free-piston Stirling engine (DFPSE) coupled with an asynchronous linear alternator. This machine integrates one piston and two displacers placed in a symmetrical way compared to the piston to improve the stability of the machine. The paper presents an analytical study of the dynamic balance equations of a DFPSE. This model takes into account the non-linear dissipative effects of the fluid and the electromagnetic forces. The dynamic balance equations of the machine are solved by means of linearized pressure in the time domain especially. The objective is to evaluate the thermo-mechanical conditions for stable operation of the engine. The developed model may be used to simulate the dynamic behaviour of a built engine. The DFPSE produces a mechanical power of 1 kW and it has a design operating point of 1.4 MPa corresponding to the frequency about 22 Hz. Helium is the working fluid. This machine is designed to be used as a micro combined heat and power (μCHP) system for combined generation of electricity and heat. |
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