Design, Modeling, and Experimental Validation of a Stirling Pressurizer With a Controlled Displacer Piston

Winkelmann, Anna; Barth, Eric J.

doi:10.1109/tmech.2015.2499706

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…It is known that non-sinusoidal trajectory control is hard for both the kinetic and free-piston engines: the slider-crank mechanisms and its kinetic inversions in traditional engines limit the gas volume of the displacer and power piston to only approximate sinusoidal curves. In most up-to-date attempts, with the progress in linear motor and control theory, Gopal et al, 12,13 Craun et al, 14 Winkelmann et al, 4 all utilized linear electrical motor to drive the piston, through the active control of which, the working gas's volume curve can better track the reference signal. Besides, fluidyne engine 19 and thermofluidic oscillator 20 are variants of the free-piston architecture, where regulator valves may be actuated to achieve better cycle performance in theory, as long as the fluid surface stability and the vapor temperature present no limiting factors.…”

Section: Parameterized Gas-piston Trajectories Designmentioning

confidence: 99%

“…As Watler et al 2 and Urieli et al 3 pointed out, ideally, the Stirling circle can reach Carnot efficiency. Since the thermodynamic efficiency of a heat engine is bounded by the temperature difference between the heat source and sink, one way is to improve the heat transfer, by improved cooling fins design , 4 porous metal insert, 5 or simply increase the temperature differential between the hot and cold sources. 6 All the above methods can be applied to any heat engine regardless of engine architecture, yet still limited by the available material, high temperature lubricants for the pistons, or the fuel source.…”

Section: Introductionmentioning

confidence: 99%

“…Craun 11 has constructed numerical models for a beta type Stirling engine and performed gas volume trajectory optimization. Gopal et al 12,13 , Craun et al, 14 and Winkelmann et al, 4 all utilized linear electrical motor to drive the piston, through the active control of which, the working gas can better approximate the ideal compression and expansion processes. Additionally, researchers have attempted to improve the overall engine performance through combined geometry and thermodynamic optimization, using techniques such as grid search, 15 particle swarm, 16 and multiobjective optimization 17,18 , which all have shown modification to the P-V trajectory in the optimized results.…”

Section: Introductionmentioning

confidence: 99%

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Study of piston trajectory parameters on the performance of a kinetic Stirling engine

Tian

Zhao

Gong

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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The Stirling engine is a type of external heat engine that is capable of extracting thermal energy from differential temperature sources and converting the energy into boundary work. Since the Stirling cycle is realized through four polytropic processes, the shape of the pressure-volume trajectory of the working medium fundamentally governs the output performance of the engine. Traditional α-, β-, γ-type engines have fixed piston trajectories, bounded by mechanical linkages, usually following approximately sinusoidal curves. Free-piston variants are capable of tailored piston trajectories if active displacer regulation is added, but still constrained by the spring-mass-damper dynamics. Currently, either kinetic or free-piston engine results in polytropic processes of the gas. During these processes, the boundary work may hinder heat transfer, potentially reducing the engine thermodynamic performance. To guide syntheses of more efficient engines, the key trajectory parameters need to be studied. This paper starts from the thermal-pressure-structural modeling of the engine, evaluates the 4 key processes during an ideal Stirling cycle, and proposes the trajectory parameters group, which finely tunes the gas curve as well as pistons’ trajectories, allowing for a detailed look into the relationship among the work medium the interactions between the pistons and the engine performance. Through establishment of a prototype engine, the models are validated through an inhouse designed and assembled test bed. Results show that manipulation of the gas volume curve is key to achieve isochoric heat addition or rejection, and the pistons trajectories determine the throttling loss performance. By applying isochoric heat transfer and reduced throttling condition, the net output work of the engine can be improved by nearly 100% against the sinusoidal baseline.

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Section: Parameterized Gas-piston Trajectories Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of piston trajectory parameters on the performance of a kinetic Stirling engine

Tian

Zhao

Gong

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…This technological leap will enable a much-needed solution to the current inadequacy of power units for untethered applications. See Winkelmann and Barth (2016) for more information. …”

Section: Controlled Stirling Fluid Power Unitmentioning

confidence: 99%

Academic fluid power research in the USA

Stelson

2018

IJHM

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Abstract:With the formation of the Center for Compact and Efficient Fluid Power (CCEFP) in 2006, there has been a resurgence of academic fluid power research in the USA. The centre's vision is to make fluid power the technology of choice for power generation, transmission, storage, and motion control. To address fluid power's key technical barriers, the CCEFP research strategy supports and coordinates pre-competitive research in three thrust areas: efficiency, compactness and effectiveness, where effectiveness means making fluid power safer, easier to use, leak free and quiet. This paper reviews some of the most important results from the first decade of CCEFP research.

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Active Stirling Thermocompressor: Modelling and effects of controlled displacer motion profile on work output

Thomas

Barth

2022

Applied Energy

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Design, Modeling, and Experimental Validation of a Stirling Pressurizer With a Controlled Displacer Piston

Cited by 7 publications

References 15 publications

Study of piston trajectory parameters on the performance of a kinetic Stirling engine

Study of piston trajectory parameters on the performance of a kinetic Stirling engine

Academic fluid power research in the USA

Active Stirling Thermocompressor: Modelling and effects of controlled displacer motion profile on work output

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