A computational fluid dynamics study on the heat transfer characteristics of the working cycle of a low-temperature-differential γ-type Stirling engine

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

doi:10.1016/j.ijheatmasstransfer.2014.03.055

Cited by 46 publications

(21 citation statements)

References 14 publications

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“…The numerical procedure in this study is the same as that used in Chen et al [12]. It is based on an in-house unstructured-mesh, fully collocated, finite-volume code 'USTREAM' developed by the corresponding author.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The pressurevelocity coupling scheme in Lebon et al [13] is adopted to take into account the variable density in compressible flows. Details of the numerical implementation of this procedure can be found in Chen et al [12] and will not be repeated here. Fig.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…All of the three geometrical parameters affect engine's compression ratio, and they can potentially pose significant impacts on engine performance. The engine in Chen et al [12] is used as the baseline engine, and the dimensions of the engine are given in Table 1. In the following subsections, the dimensions of those geometrical parameters are set to vary in the neighborhood of the dimensions of the baseline engine to investigate their effects.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The Stirling engine in this study is the twin-power piston c-type Stirling engine first reported in Chen et al [10,11], where the engine was experimentally studied and numerically analyzed by an improved variant of the second-order model. Later, Chen et al [12] conducted a CFD study on this engine aiming at the understanding of the general physical processes in its engine cycle. This study is a follow-up study of Chen et al [12], and focuses on investigating the effects posed by different geometrical and operational parameters.…”

Section: Introductionmentioning

confidence: 99%

“…Later, Chen et al [12] conducted a CFD study on this engine aiming at the understanding of the general physical processes in its engine cycle. This study is a follow-up study of Chen et al [12], and focuses on investigating the effects posed by different geometrical and operational parameters. Fig.…”

Section: Introductionmentioning

confidence: 99%

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A CFD parametric study on the performance of a low-temperature-differential γ -type Stirling engine

Chen

Salazar

2015

Energy Conversion and Management

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An in-house CFD code has been applied to a low-temperature-differential (LTD) c-type Stirling engine to understand the effects posed by several geometrical and operational parameters on engine performance. The results include variations of pressure, temperature, and heat transfer rates within an engine cycle as well as variations of engine's power and efficiency versus these parameters. It is found that power piston stroke and radius influence engine performance very similarly, and power and efficiency both increase as these two parameters increase. In fact, the effects of the two parameters can be assimilated into those by the parameter of compression ratio. The stroke of displacer is observed to affect strongly on heat input but weakly on power, thus causing the efficiency to decrease as it increases. As expected, both power and efficiency increase as temperature difference between the hot and cold ends increases. Lastly, engine speed is observed to pose strong positive effects on power but exert weak effects on efficiency. This study reveals the effects produced by several important parameters on engine performance, and such information is very useful for the design of new LTD Stirling engines.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A CFD parametric study on the performance of a low-temperature-differential γ -type Stirling engine

Chen

Salazar

2015

Energy Conversion and Management

Self Cite

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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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A novel Gamma‐type duplex Stirling system to convert heat energy to cooling power: Theoretical and experimental study

2021

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This article aims at coupling two Stirling machines together to produce cooling power from different heat sources. Two identical Gamma-type ST500 Stirling machines are coupled together. The first machine, named Stirling engine, is powered by burning natural gas and an electrical power supply as an auxiliary starter. The Stirling engine is connected to a second Stirling machine named Stirling refrigerator by a mechanical belt. The driving force is transferred to the Stirling refrigerator using the mechanical belt. Mechanical energy is then converted to cold energy in the Stirling refrigerator. This study presents the experimental and theoretical results by examining the whole system named duplex Stirling refrigerator system. Five experiments are performed on the system at different pressures to evaluate the results. Water circulation in copper coils is used to determine the cooling flux produced by the Stirling refrigerator. Finally, the coefficient of performance (COP) is calculated. The experimental data are validated using a MATLAB-based code developed based on the presented formulas in this study. The results show that the system's maximum COP and electrical efficiency, consisting of two similar 500 W Gamma-type Stirling machines, are between 0.21% and 70.8%, respectively. Setup theoretical and experimental efficiencies are 0.24 and 0.21, respectively, at the best case.The experimental results of the duplex Stirling refrigerator system used in this study are compared with the simulation results. Finally, the experimental results of this study are compared with some other reported results from different authors on the subject of the duplex Stirling refrigerator.

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A computational fluid dynamics study on the heat transfer characteristics of the working cycle of a low-temperature-differential γ-type Stirling engine

Cited by 46 publications

References 14 publications

A CFD parametric study on the performance of a low-temperature-differential γ -type Stirling engine

A CFD parametric study on the performance of a low-temperature-differential γ -type Stirling engine

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

A novel Gamma‐type duplex Stirling system to convert heat energy to cooling power: Theoretical and experimental study

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