A novel methodology on beta-type Stirling engine simulation using CFD

Caetano, Bryan Castro; Lara, Isadora F.; Borges, Matheus Ungaretti; Sandoval, Oscar R.; Valle, Ramón Molina

doi:10.1016/j.enconman.2019.01.075

Cited by 31 publications

(15 citation statements)

References 26 publications

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“…It is noted that the thermal efficiency and indicated power both rise considerably as the heating temperature increases. In particular, the indicated power increases from 30.3 to 111.5 W and thermal efficiency rises from 13.3% to 42.3% as the heating temperature is lifted between 673 and 1173 K. The variation is expected since the real Stirling engine performance follows the same trend of the ideal Stirling engine that its performance increases with the heating temperature 20 …”

Section: Resultsmentioning

confidence: 94%

“…In particular, the indicated power increases from 30.3 to 111.5 W and thermal efficiency rises from 13.3% to 42.3% as the heating temperature is lifted between 673 and 1173 K. The variation is expected since the real Stirling engine performance follows the same trend of the ideal Stirling engine that its performance increases with the heating temperature. 20 The variation of engine performance against the cooling temperature is illustrated in Figure 15. One can see that as the cooling temperature is elevated from 200 to 350 K, the indicated power is reduced from 138.3 to 65.3 W and thermal efficiency decreased from 47.3% to 28.2%.…”

Section: Parametric Studymentioning

confidence: 99%

“…The study indicated that choosing helium as working gas leads to the highest engine performance. A combination of Schmidt's model and a steady‐state CFD simulation to yield the initial and boundary conditions for the numerical analysis of a β‐type Stirling engine was proposed by Caetano et al 20 The method not only led to a decrease in computational time but also enhanced the accurate prediction of the indicated power. El‐Ghafour et al 21 showed that CFD simulation with the combination of enhanced wall treatment and realizable k‐ε model for the GPU‐3 Stirling engine provides the most accurate prediction among 6 turbulent models.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 94%

Section: Parametric Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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 complexity of flow and turbulence characteristics was studied in [13] by using multidimensional CFD method validated with ST05G engine. In [14], a discrete ordinates (DO) radiation model and displacer temperature boundary condition were used in CFD simulation to further reduce the error in performance prediction of a beta type Stirling engine prototype.…”

Section: Introductionmentioning

confidence: 99%

The CFD methodology for simulating pumping loss from displacer and piston seals of free piston Stirling engine

et al. 2022

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A new axisymmetric CFD model capable of describing pumping loss is proposed for free piston Stirling engine (FPSE). Inclusion of clearance seals, bounce space, heater, cooler and regenerator in a single model is the unique strength of this work. For transient simulation of engine, dynamic mesh was utilized for catering needs of moving boundaries. The model was validated with 12.5 kW component test power converter (CTPC) and successfully predicted indicated power, efficiency, pressure amplitude, pressure drop, and gas temperature in expansion and compression space at different piston amplitudes with 6% maximum deviation. The results showed that the heat exchange at heater and cooler was minimized at each flow reversal and was strongly influenced by oscillating gas flow rate. The results also present optimum displacer and piston seal clearance at different charge pressure and operating frequencies. The displacer seal clearance could be increased up to 125?m without compromising power: however, engine output was severely affected with increasing piston seal gap.

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“…The approach was validated with robustness and the indicated power can be improved by 56%. Three-dimensional simulation based on CFD software has been used to investigate the distribution of temperature and pressure inside a beta-type Stirling engine [20,21]. Compared to high-temperature Stirling engines, moderate-temperature ones produce lower power and efficiency.…”

Section: Introductionmentioning

confidence: 99%

Development of a Beta-Type Moderate-Temperature-Differential Stirling Engine Based on Computational and Experimental Methods

Cheng

Huang

2020

Energies

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Stirling engine is a favorable technique in the application of waste heat recovery or cogeneration system. This paper aims at developing a beta-type Stirling engine which is operated at moderate heating temperature (773–973 K). Rhombic drive mechanism is utilized to make coaxial motion of displacer and piston. Based on the proposed dimensions, a theoretical model combining thermodynamic and dynamic analysis is built to predict the performance of the Stirling engine. Thermodynamic analysis deals with variations of properties in each chamber while dynamic analysis handles the resultant shaft torque produced by the Stirling engine. Furthermore, a prototype engine is manufactured, and experimental test is carried out to validate the simulated results in this research. Under heating temperature of 973 K, charged pressure of 8 bar, rotation speed of 1944 rpm, shaft power of 68 W is obtained from the prototype Stirling engine. Power density is calculated to be 1.889 W-c.c.−1 by theoretical prediction and 1.725 W-c.c.−1 by tested result. The impact of the geometrical dimensions is investigated to survey the optimal piston diameter which is related to compression ratio and swept volume.

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A novel methodology on beta-type Stirling engine simulation using CFD

Cited by 31 publications

References 26 publications

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

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

The CFD methodology for simulating pumping loss from displacer and piston seals of free piston Stirling engine

Development of a Beta-Type Moderate-Temperature-Differential Stirling Engine Based on Computational and Experimental Methods

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