Derivation and numerical case study of a one-dimensional, compressible-flow model of a novel free-piston Stirling engine

Bat, B.J.G. de la; Harms, Thomas; Dobson, Robert T.; Bell, Arthur

doi:10.1016/j.energy.2020.117404

Cited by 19 publications

(4 citation statements)

References 10 publications

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“…Compared with previous models, the improvement in the present model was the consideration of the VDW equation instead of the perfect gas equation. The semi-real gas effect was achieved in the calculations of mass fluxes according to Equations ( 18) to ( 22), pressure fluctuation according to Equation (24), and temperature variation according to Equation (25). VDW assumption is important for predicting the output power of the SE especially when pressures are high and interactions between molecules are significant.…”

Section: Discussionmentioning

confidence: 99%

“…According to the GPU-3 Stirling engine's thermal simulation, the ideal mean effective pressure for Helium gas is higher than that for hydrogen gas. To evaluate the performance of a 100 W Stirling engine, De la Bat et al 25 developed a third-order theoretical model. The proposed implementing a control system based on their sensitivities study in order to assure the engine's constant running.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical investigations of Stirling engine performances for different filling gas properties

Hachem

Gheith

Aloui

2022

Intl J of Energy Research

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Summary Stirling engine research has increased and opened new industrial opportunities. Stirling engines have the advantage of running on any sort of thermal energy. However, their biggest downside is their low experimental efficiency compared to Carnot's optimal efficiency. Thus, much research studies the optimal working parameters of this engine. Most existing models evaluate the Stirling engine's performance using the perfect gas assumption. However, this assumption is only valid for low pressures. At high pressure, real gas behaves differently from perfect gas. Hence the necessity and the interest of the conducted research work. The major goal of this numerical study was to analyze the influence of gas qualities on Stirling engine power and efficiency using a semi‐real gas assumption. The impact of operating and geometric parameters on the performance of a four‐cylinder Stirling engine (FCSE) were explored for three monatomic gases (Helium, Neon, and Argon) and one diatomic gas (Nitrogen). The dependence of volume ratio, regenerator form factor, load pressure, hot end temperature and rotation speed on gas properties were investigated. Major significant losses were accounted for at different conditions. To figure out parameters that maintain the highest performance, four different regenerator porosity (60%, 70%, 80%, 90%), three different cylinder diameters (3.5, 4, 4.5 cm) and three different phase shifts between the two pistons (2π5, π2, 3π5) were evaluated. As regards, the obtained results, not only the optimum parameters that provide higher output power were identified but also predicted correlations for each studied filling fluid as a function of the geometric and operating parameters. The outcomes of the study would be very helpful for a new more powerful engine design. The obtained results clearly demonstrated that: (a) The choice of the filling gas is determined by the regenerator form factor. (b) The optimum volume ratio for nitrogen is roughly 1.1, whereas for Helium it is around 0.7. (c) For Helium and Neon, the output power diminishes as the volume ratio rises. (d) The output power increases significantly when the regenerator form factor (length by diameter) <0.2 and then reaches an optimum of around 2.1 kW for the Helium case. (e) Among the four studied gases, the use of Helium allows obtaining the highest output power. On the other hand, it is observed that the lowest output power is obtained when using Argon. Inside Stirling engines, the use of lightweight monoatomic gases (with high thermal conductivity and heat capacity values) boosts the output power. There is a variation in power up to 50% depending on the properties of the filling gas.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theoretical investigations of Stirling engine performances for different filling gas properties

Hachem

Gheith

Aloui

2022

Intl J of Energy Research

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“…Output power is taken from a linear alternator. Usually a permanent magnet is attached to the working piston, producing electricity directly from the linear stroke of the piston, moving through the alternator field coil [16,17,[20][21][22][23][24][25]. The FPSE works as the kinematic Stirling engine.…”

Section: Operation Modementioning

confidence: 99%

“…In particular, flexure springs are attached to the respective displacer and working piston, releasing mechanical energy as the flywheel in the kinematic Stirling engine. By this way, the movement of the displacer and the piston is independent, only based on the pressure variation of the working gas [16,17,[20][21][22][23][24][25][26].…”

Section: Operation Modementioning

confidence: 99%

Free-Piston Stirling Engine Technologies and Models: A Review

Perozziello

Grosu

Vaglieco³

2021

Energies

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The Stirling engine is an alternative solution to produce cleaner energy in order to achieve the reduction of the fossil fuel consumption and the CO2 emissions. It comprises an external combustion engine that can convert any external heat source into mechanical power, through cyclic expansion and compression of a working gas in a closed-regenerative cycle, with or without driving mechanisms. The free-piston Stirling Engine is significantly preferred because of the absence of any mechanical linkage resulting in longer operating life, lower noise pollution, maintenance and vibration free, self-starting and high thermal efficiency. The aim of this paper is to summarize the research works on the free-piston Stirling engine technologies and models. First, the working principles of the free-piston Stirling engine are described, identifying different configurations. Then, several applications are presented. Finally, a detailed review of the models available in literature is given, pointing out the main assumptions and equations.

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A novel approach towards the selection of regenerators for optimal Stirling engine performance based on energy and exergy analyses

Yu,

Zhang,

et al. 2023

Sci. China Technol. Sci.

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Derivation and numerical case study of a one-dimensional, compressible-flow model of a novel free-piston Stirling engine

Cited by 19 publications

References 10 publications

Theoretical investigations of Stirling engine performances for different filling gas properties

Theoretical investigations of Stirling engine performances for different filling gas properties

Free-Piston Stirling Engine Technologies and Models: A Review

A novel approach towards the selection of regenerators for optimal Stirling engine performance based on energy and exergy analyses

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