Parametric investigation of the phase characteristics of a beta-type free piston Stirling engine based on a thermodynamic-dynamic coupled model

Chen, Pengfan; Yang, Peng; Liu, Liu; Liu, Yingwen

doi:10.1016/j.energy.2020.119658

Cited by 14 publications

(2 citation statements)

References 26 publications

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“…Figure 12 shows the force vector diagrams of the DP and PP, which are drawn from the linearized EOMs in Equation (7). The force vector diagram is composed of the inertial force, damping force, stiffness force, and pressure force, which is frequently used in the FPSE dynamics analyses [26][27][28]. In order to maintain a finite amplitude vibration, called also as limit cycle, the pressure force overcomes the damping force: the flow resistance of heat exchanger part for DP and the external load damping of linear alternator for PP.…”

Section: Discussion On Fpse Resonance With Phase Anglementioning

confidence: 99%

Linear Dynamic Analysis of Free-Piston Stirling Engines on Operable Charge Pressure and Working Frequency along with Experimental Verifications

Kim

Sim

2021

Applied Sciences

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This paper presents a linear dynamic analysis on operable charge pressure and working frequency of free-piston Stirling engines (FPSE) along with experimental verifications. The equations of motion of the FPSE are formulated as a 2-degree-of-freedom (DOF) vibration system of the power piston (PP) and displacer piston (DP), based on the state equation of ideal gas and the isothermal Stirling cycle model. The dynamic models of FPSE we considered are the 1-DOF simple vibration model of each piston and the 2-DOF root locus model of coupled pistons. We developed a test FPSE for verification of the dynamic models and conducted a series of experiments to measure the dynamic behaviors of PP and DP under varying charge pressures for various masses and stiffnesses of the PP. As a result, both prediction models showed good agreements with experimental results. The 1-DOF vibration model was found to be simple and effective for predicting the operating frequency and charge pressure of FPSE. The root locus method showed reasonable predictions with an operation criterion of the PP–DP phase angle of 90°. In addition, the FPSE was confirmed to operate in resonant oscillations when the DP–PP phase angle is 90°, based on analysis of the force vector diagram of the two pistons.

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Section: Discussion On Fpse Resonance With Phase Anglementioning

confidence: 99%

Linear Dynamic Analysis of Free-Piston Stirling Engines on Operable Charge Pressure and Working Frequency along with Experimental Verifications

Kim

Sim

2021

Applied Sciences

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“…There are many experimental and numerical studies in the literature on different Stirling engine types in addition to design and manufacturing while examining the performance characteristics of Stirling engines. [13][14][15][16][17][18] However, it is understood that studies on energy and exergy analyses of Stirling engines are inadequate. In the literature, energy and exergy analyses have been conducted for some Stirling engine-assisted hybrid systems.…”

Section: Introductionmentioning

confidence: 99%

The effects of different channel geometries in the displacer cylinder, working fluids, and engine speed on the energy and exergy performance characteristics of a β-type Stirling engine with a slider-crank drive mechanism

Doğan

Erol

Yeşilyurt

et al. 2023

International Journal of Engine Research

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Stirling engines are power generation systems working with the external heating principle and converting heat energy into mechanical energy. In this study, thermodynamic analyses were performed using the data of performance tests in which helium, nitrogen, and air were utilized as working fluids in a β-type Stirling engine with a swept volume of 365 cm3 and a slider-crank drive mechanism. Moreover, the impact of different channel geometries in the displacer cylinder on engine power was revealed. In the study, three displacer cylinders, smooth, 66-slot channel, and 120-slot channel displacer cylinders, were used. Performance tests were conducted at five charge pressures varying between 1 and 5 bar, with the hot end temperature of 1000 ± 10 K and the cold end temperature of 300 ± 5 K. The heat transferred to the hot zone, thermal losses and efficiency were calculated in the energy analysis. The highest thermal efficiency was 45.50% when a 120-slot channel displacer cylinder was used with helium as the working fluid. Thermal efficiency values were 32.87% and 32.60% for nitrogen and air, respectively, under the same conditions. Entropy generation, exergy destruction, and exergy efficiency were calculated in the exergy analysis. The lowest exergy destruction was obtained using a 120-slot channel displacer cylinder with helium as the working fluid. Furthermore, the impact of engine speed on exergy efficiency was determined.

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Study on Nonlinear Effects of Power Piston Spring Stiffness of Free Piston Stirling Engine

Jiao,

Yang,

Chi

et al. 2023

Advanced Topics in Science and Technology in China

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Parametric investigation of the phase characteristics of a beta-type free piston Stirling engine based on a thermodynamic-dynamic coupled model

Cited by 14 publications

References 26 publications

Linear Dynamic Analysis of Free-Piston Stirling Engines on Operable Charge Pressure and Working Frequency along with Experimental Verifications

Linear Dynamic Analysis of Free-Piston Stirling Engines on Operable Charge Pressure and Working Frequency along with Experimental Verifications

The effects of different channel geometries in the displacer cylinder, working fluids, and engine speed on the energy and exergy performance characteristics of a β-type Stirling engine with a slider-crank drive mechanism

Study on Nonlinear Effects of Power Piston Spring Stiffness of Free Piston Stirling Engine

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