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Development and Performance Measurements of a Beta-Type Free-Piston Stirling Engine along with Dynamic Model Predictions

[+] Author and Article Information
Kyuho Sim

Department of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul, Korea
khsim@seoultech.ac.kr

Dong-Jun Kim

Department of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul, Korea
djkim6300@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4036967 History: Received March 30, 2017; Revised April 24, 2017

Abstract

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-degree-of-freedom (2-DOF) 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 behavior, 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.

Copyright (c) 2017 by ASME
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