A numerical study on the effects of moving regenerator to the performance of a β -type Stirling engine

Chen, Wen Lih; Wong, King Leung; Chang, Yu Feng

doi:10.1016/j.ijheatmasstransfer.2014.12.035

Cited by 31 publications

(6 citation statements)

References 20 publications

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“…24 In 2015, Chen et al theoretically investigated the effects of gas movements in regenerator on engine performance using the CFD analysis program. 25 Zainudin et al theoretically examined the thermodynamic analysis of a rhombic mechanism. In that research, the thermodynamic assessments of a Stirling engine using a numerical model were made by the isothermal analysis.…”

Section: Introductionmentioning

confidence: 99%

The examination of performance characteristics of a beta‐type Stirling engine with a rhombic mechanism: The influence of various working fluids and displacer piston materials

Erol

Çalışkan

2021

Int J Energy Res

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In this study, to develop a power generation system that can use renewable energy resources more efficiently, a beta-type Stirling engine with rhombic mechanism was designed and manufactured. Kinematic and thermodynamic analyses of a beta-type Stirling engine were performed numerically in the Fortran program.Volume and pressure changes depending on crankshaft angle of Stirling engine were made using the isothermal analysis. The effects of the basic parameters related to engine performance, such as working fluid mass, charge pressure, heater, and coolant temperatures, on the net work amount were investigated. Five different gases, including helium, air, nitrogen, carbon dioxide, and argon, were used as a working fluid in experimental studies. The effects of all these gases on engine performance characteristics were examined at charge pressures of 1 to 5 bar for two different displacer pistons made of stainless steel and titanium material. The performance characteristics of Stirling engine manufactured were tested using a specially designed electrical heater, at 727 C hot end and 27 C cold end temperature, depending on engine speed. In all experimental studies, maximum power output was acquired to be 215.48 W, at 4 bar and 550 rpm when a stainless steel displacer piston and helium gas as a working fluid were used, and maximum torque value was acquired to be 7.54 Nm, at 5 bar and 150 rpm. The lowest engine power output among maximum engine powers was acquired to be 34.66 W when argon gas was used as a working fluid at 3 bar and 300 rpm, using a displacer piston made of titanium material. Maximum power output acquired in the experimental studies using a stainless steel displacer piston and helium; it was determined that it is 72.12%, 73.69%, 241.49%, and 288.81% higher than the engine power acquired by nitrogen, air, carbon dioxide, and argon gases, respectively.

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Section: Introductionmentioning

confidence: 99%

The examination of performance characteristics of a beta‐type Stirling engine with a rhombic mechanism: The influence of various working fluids and displacer piston materials

Erol

Çalışkan

2021

Int J Energy Res

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“…Aksoy et al 13 showed that a grooved‐displacer cylinder enhances the power of the β‐type Stirling engine significantly. The impact of the moving regenerator on engine performance was investigated by Chen et al 14 It was shown that the engines with moving regenerator have less heat transfer rates and have a considerable improvement in the thermal efficiency and power out than those without the moving regenerator. Cheng et al 15 made a prototype β‐type Stirling engine of 300 W and utilized a non‐ideal adiabatic model to evaluate its engine performance.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study of a compact 100‐W‐class β‐type Stirling engine

Cheng

Phung

2020

Int J Energy Res

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The study aims to present a three-dimensional CFD model for simulating the physical phenomena in a compact 100-W β-type Stirling engine. The thermal efficiency and the indicated power can be further computed based on numerical predictions. The effects of some influential parameters on the engine performance have been carried out through a parametric study around a chosen baseline case. In parallel, a prototype engine is built for testing. Experiments are conducted to obtain the shaft power. The mechanical power loss dependent on the rotation speed, and the heating temperature is evaluated based on the numerical and experimental data. The engine can reach up to 87.2 W at the 1350 rpm rotation speed. The maximum thermal efficiency is 41.9% at the 10 bar charged pressure while the power can be significantly raised to 507.3 W at the 15 bar charged pressure. As the heating temperature is lifted between 673 and 1173 K, the power raises from 30.3 to 111.5 W and the thermal efficiency goes up from 13.3% to 42.3%. As the cooling temperature is raised from 200 to 350 K, the power decreases from 138.3 W to 65.3 W and the thermal efficiency falls from 47.3% to 28.2%. An increase in the piston length from 49.5 to 61.5 mm lifts the power from 61.8 to 85.9 W, while the thermal efficiency reaches a peak of 35.1% at 58.5 mm.

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“…Many models have been presented in recent years, including empirical [5][6][7][8], analytical [9][10][11][12][13][14][15][16][17][18] and numerical approaches. For numerical models, they can be categorized into second-order , third-order [47][48][49][50] and multi-dimensional computational fluid dynamics [51][52][53][54] methods.…”

Section: Introductionmentioning

confidence: 99%

“…Féniès et al [46] used an equivalent electrical network model to account for the gas, mechanical dynamics and global energy equilibrium for a free piston Stirling engine. Due to the complexity and difficulty of the methods, fewer work have been done on third-order models [47][48][49][50] and multi-dimensional computational fluid dynamics models [51][52][53][54].…”

Section: Introductionmentioning

confidence: 99%

A transient one-dimensional numerical model for kinetic Stirling engine

et al. 2016

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A third-order numerical model based on one-dimensional computational fluid dynamics is developed for kinetic Stirling engines. Various loss mechanisms in Stirling engines, including gas spring hysteresis loss, shuttle loss, appendix displacer gap loss, gas leakage loss, finite speed loss, piston friction loss, pressure drop loss, heat conduction loss, mechanical loss and imperfect heat transfer, are considered and embedded into the basic control equations. The non-equilibrium thermal model is adopted for the regenerator to capture the oscillating features of the gas and solid temperatures. To improve the numerical stability and accuracy, the implicit second-order time difference scheme and the second-order upwind scheme are adopted for discretizing the time differential terms and convective terms, respectively. Experimental validations are then conducted on a beta-type Stirling engine with the extensive experimental data for diverse working conditions. The results show that the developed model has better accuracies over previous second-order models. Good agreements are achieved for predicting various critical system parameters, including pressure-volume diagram, indicated power, brake power, indicated efficiency, brake efficiency and mechanical efficiency. In particular, both the experiments and simulations show that the Stirling engine charged with helium tends to have much lower optimal working frequencies and poorer performances compared to the hydrogen system. Based on the analyses of the losses, it reveals that the pressure drop in the flow channels plays a critical role in shaping the different behaviors. The pressure drop in the helium system is much larger and more sensitive to the frequency increase due to the much larger viscosity of gaseous helium. Hydrogen is a superior working gas for a Stirling engine. The transient characteristics of the oscillating flow and the associated thermal interactions between gas and solid in the regenerator are finally analyzed in order to have an insight of the complex thermodynamic process. The study provides a promising numerical approach in simulating Stirling engines for further understandings of their operating characteristics and the underling mechanisms.

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A numerical study on the effects of moving regenerator to the performance of a β -type Stirling engine

Cited by 31 publications

References 20 publications

The examination of performance characteristics of a beta‐type Stirling engine with a rhombic mechanism: The influence of various working fluids and displacer piston materials

The examination of performance characteristics of a beta‐type Stirling engine with a rhombic mechanism: The influence of various working fluids and displacer piston materials

Numerical and experimental study of a compact 100‐W‐class β‐type Stirling engine

A transient one-dimensional numerical model for kinetic Stirling engine

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