A Lumped-Parameter Dynamic Model of a Thermal Regenerator for Free-Piston Stirling Engines

2009 ◽  
Author(s):  
Mark Hofacker ◽  
James Kong ◽  
Eric J. Barth
Keyword(s):  
Dynamic Model ◽  
Control Volume ◽  
Matrix Material ◽  
Stirling Engine ◽  
Functional Requirements ◽  
Free Piston ◽  
Lumped Parameter ◽  
Dynamics And Control ◽  
Free Piston Stirling Engine ◽  
And Control

This paper uses lumped parameter dynamic equations to model the mass flow, piston dynamics, and control volume behavior inside a free-piston Stirling engine. A new model for a Stirling engine thermal regenerator that incorporates a dynamically changing temperature gradient is presented. The use of graphite as a regenerator matrix material is justified despite its limited background by comparing the functional requirements of regenerators to heat exchangers where graphite use is commonplace. Experimental results are used to characterize a graphite regenerator and validate the dynamic model.

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

2017 ◽  
Vol 139 (11) ◽  
Author(s):  
Kyuho Sim ◽  
Dong-Jun Kim
Keyword(s):  
Dynamic Model ◽  
Stirling Engine ◽  
Electric Heater ◽  
Performance Measurements ◽  
Free Piston ◽  
Dynamic Behaviors ◽  
Output Performance ◽  
Model Predictions ◽  
And Performance ◽  
Free Piston Stirling Engine

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.

Nanogrid for Home Application for Micro CHP based on Free Piston Stirling Engine

2020 ◽  
Author(s):  
Daniele Menniti ◽  
Anna Pinnarelli ◽  
Nicola Sorrentino ◽  
Giuseppe Barone ◽  
Giovanni Brusco ◽  
...  
Keyword(s):  
Stirling Engine ◽  
Free Piston ◽  
Free Piston Stirling Engine
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