This paper presents the development and performance measurements of a beta-type free-piston Stirling engine (FPSE) along with dynamic model predictions. The FPSE is modeled as a two degrees-of-freedom (2DOF) vibration system with the equations of motion for displacer and piston masses, which are connected to the spring and damping elements and coupled by working pressure. A test FPSE is designed from root locus analyses and developed with flexure springs and a dashpot load. The stiffness of the test springs and the damping characteristics of the dashpot are identified through experiments. An experimental test rig is developed with an electric heater and a water cooler, operating under the atmospheric air. The piston dynamic behaviors, including the operating frequency, piston stroke, and phase angle, and engine output performance are measured at various heater temperatures and external loads. The experimental results are compared to dynamic model predictions. The test FPSE is also compared to a conventional kinematic engine in terms of engine output performance and dynamic adaptation to environments. Incidentally, nonlinear dynamic behaviors are observed during the experiments and discussed in detail.
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November 2017
Research-Article
Development and Performance Measurements of a Beta-Type Free-Piston Stirling Engine Along With Dynamic Model Predictions
Kyuho Sim,
Kyuho Sim
Department of Mechanical System
Design Engineering,
Seoul National University of Science
and Technology,
Seoul 01811, South Korea
e-mail: khsim@seoultech.ac.kr
Design Engineering,
Seoul National University of Science
and Technology,
Seoul 01811, South Korea
e-mail: khsim@seoultech.ac.kr
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Dong-Jun Kim
Dong-Jun Kim
Department of Mechanical System
Design Engineering,
Seoul National University of Science
and Technology,
Seoul 01811, South Korea
e-mail: djkim6300@gmail.com
Design Engineering,
Seoul National University of Science
and Technology,
Seoul 01811, South Korea
e-mail: djkim6300@gmail.com
Search for other works by this author on:
Kyuho Sim
Department of Mechanical System
Design Engineering,
Seoul National University of Science
and Technology,
Seoul 01811, South Korea
e-mail: khsim@seoultech.ac.kr
Design Engineering,
Seoul National University of Science
and Technology,
Seoul 01811, South Korea
e-mail: khsim@seoultech.ac.kr
Dong-Jun Kim
Department of Mechanical System
Design Engineering,
Seoul National University of Science
and Technology,
Seoul 01811, South Korea
e-mail: djkim6300@gmail.com
Design Engineering,
Seoul National University of Science
and Technology,
Seoul 01811, South Korea
e-mail: djkim6300@gmail.com
1Corresponding author.
Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received March 30, 2017; final manuscript received April 24, 2017; published online August 1, 2017. Editor: David Wisler.
J. Eng. Gas Turbines Power. Nov 2017, 139(11): 112806 (13 pages)
Published Online: August 1, 2017
Article history
Received:
March 30, 2017
Revised:
April 24, 2017
Citation
Sim, K., and Kim, D. (August 1, 2017). "Development and Performance Measurements of a Beta-Type Free-Piston Stirling Engine Along With Dynamic Model Predictions." ASME. J. Eng. Gas Turbines Power. November 2017; 139(11): 112806. https://doi.org/10.1115/1.4036967
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