Performance Analysis of the Small-Scale α-Type Stirling Engine Using Computational Fluid Dynamics Tools

Buliński, Zbigniew; Szczygieł, Ireneusz; Kabaj, Adam; Krysinski, Tomasz; Gładysz, Paweł; Czarnowska, Lucyna; Stanek, Wojciech

doi:10.1115/1.4037810

Cited by 13 publications

(4 citation statements)

References 19 publications

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“…By fitting in number into the Reynolds number equation and assuming the case as external flow, the result is 14000 which is less than 5e 5 . For the transition case, the velocity was set to 100 m/s, the result is 7e 5 which is greater than 5e 5 and less than 10e 7 . According to the below table 5.…”

Section: Forced Convection Casementioning

confidence: 99%

“…A considerable amount of research and development has gone into these systems, which are capable of producing power from waste heat at minimal temperatures [6]. Because of the oscillating nature of the working fluid evolvement, studying the Stirling engine is extremely complicated [7]. Varied thermodynamic methods of the Stirling engine functioning with various assumptions have been proposed in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer Enhancement in Stirling Engines Using Fins with Different Configurations and Air Flow

Gomma

Alsit

Dol

2022

CFDL

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The Stirling engine, in comparison to other classical engines, is an external enclosed heat engine cycle with extraordinary theoretical efficiency and minimal emissions. However, when combined with a minor heat source, the productivity of the Stirling engine suffers. Thus, this study emphasizes research on improving engine performance using heat transfer. A simulation was done using CFD analysis in ANSYS Fluent to enhance heat transfer using different types of fins, air blowers, and roughness. κ-ω SST model was used as the turbulence model to capture the heat transfer behavior near and away from the surface. All runs showed a higher heat transfer rate per unit area than the no finned case. Increasing the number of fins reduces the heat transfer by 10 %, Applying this solution would cost more since more material is needed to decrease the gap between fins. When doubling the length of the fin, the heat transfer of the circular design was reduced by 1%, the pinned design by 5%, and the squared design by 30%. The addition of fins reduced the flow of heat to the cold end and kept the temperature near the cold end below 100°C. Increasing the roughness resulted in a small increase in heat flow. Comparing the laminar flow to the transitional flow, the transitional flow increases the heat transfer by 1000%.

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Section: Forced Convection Casementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement in Stirling Engines Using Fins with Different Configurations and Air Flow

Gomma

Alsit

Dol

2022

CFDL

View full text Add to dashboard Cite

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“…To be specific, current cutting-edge batteries have an energy density of 0.05~0.265 kWh/kg, which is ~1/60th (for the upper energy density limit) of that of typical hydrocarbon fuel, such as methane (CH 4 ) [1,5]. Many physical and chemical processes impact micro-combustion systems; topics such as gas-phase phenomena, surface reactions, species transport, and thermal properties of the combustor material, as well as thermal and mass diffusion, convection, and radiation can all have a dramatic impact on a specific application [1,[5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Ignition and Stability Limits of Premixed Methane/Air Combustion in Micro-Channels

Kutkut,

Ayoobi,

Baumgardner

et al. 2023

Energies

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Understanding and improving the performance of miniature devices powered by micro-combustion have been the focus of continued attention of researchers recently. The goal of the present work is to investigate the behavior of premixed methane–air combustion in a quartz microreactor with an externally controlled wall temperature. Specifically, the impacts of the flow inlet velocity, the equivalence ratio, and the microreactor channel size are examined. This study is conducted by means of computational simulations, and the results are validated against prior experimental data, as well as by other similar studies in the literature. Utilizing simulation results with detailed chemistry, the present work provides more in-depth insight into a variety of phenomena, such as ignition, flame propagation, flames with repetitive extinctions and ignitions (FREI), and flame stabilization. In particular, the ignition, the flame span, and the FREI-related characteristics are scrutinized to understand the underlying physics of the flame stability/instability modes. It is shown that the flames appear stable at higher inlet velocities, while the FREI mode is detected at a lower inlet velocity, depending on the equivalence ratio and the channel size. The findings also explain how different operating conditions impact the flame characteristics in both stability modes.

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“…For ensuring energy security in near future and to mitigate life threatening consequences of energy utilization such as climate change, herculean research efforts are being made for developing viable alternative fuels [1][2][3][4] and suitable engine technology [5][6][7][8][9][10] for the global transport sector. Infrastructure investment requirement favors the use of renewable alternatives for fueling existing vehicles and it fits well in the current fuel supply scenario as well.…”

Section: Introductionmentioning

confidence: 99%

Review of Experimental and Computational Studies on Spray, Combustion, Performance, and Emission Characteristics of Biodiesel Fueled Engines

Ágarwal

Park

Dhar

et al. 2018

Journal of Energy Resources Technology

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Biodiesel has emerged as a suitable alternative to mineral diesel in compression ignition (CI) engines in order to ensure global energy security and to reduce engine out emissions in near future. Biodiesel derived from various feedstocks available worldwide fits well in the current fuel supply arrangement for transport sector. However, biodiesel as an alternative transportation fuel has been extensively investigated because of differences in its important fuel properties compared with baseline mineral diesel. Since fuel properties greatly influence spray development, combustion, and emission formation in internal combustion (IC) engines, a number of experimental and computational studies on biodiesel usage in CI engines have been performed to determine its brake thermal efficiency (BTE), gaseous emissions, durability, etc., by various researchers using variety of engines and feedstocks. In the present paper, a critical review of the effect of biodiesel's fuel properties on engine performance, emissions, and combustion characteristics in existing diesel engines vis-a-vis conventional diesel has been undertaken. In addition, the progress and advances of numerical modeling involving biodiesel are also reviewed to determine the effect of fuel properties on spray evolution and development of reaction mechanisms for biodiesel combustion simulations. Fuel properties are discussed in two categories: physical and chemical properties, which are key parameters affecting spray and combustion processes. Subsequent sections review spray, combustion, emissions, and performance characteristics of biodiesels under various engine operation conditions. In the last section of this review paper, numerical modeling of biodiesel covering recent numerical models and schemes to understand the behavior of biodiesel combustion and pollutants formation is included. This review paper comprehensively summarizes biodiesel fuel's (BDFs) spray, combustion, and emission characteristics using experimental and numerical approaches. Limitations and scope for future studies are discussed in each section.

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Performance Analysis of the Small-Scale α-Type Stirling Engine Using Computational Fluid Dynamics Tools

Cited by 13 publications

References 19 publications

Heat Transfer Enhancement in Stirling Engines Using Fins with Different Configurations and Air Flow

Heat Transfer Enhancement in Stirling Engines Using Fins with Different Configurations and Air Flow

Investigating the Ignition and Stability Limits of Premixed Methane/Air Combustion in Micro-Channels

Review of Experimental and Computational Studies on Spray, Combustion, Performance, and Emission Characteristics of Biodiesel Fueled Engines

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