Free-Piston Stirling Engine Technologies and Models: A Review

Perozziello, Carmela; Grosu, Lavinia; Vaglieco, Bianca Maria

doi:10.3390/en14217009

Cited by 13 publications

(8 citation statements)

References 85 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are many theoretical studies of FPSG have been conducted using thermodynamic or dynamic approaches 12 . The articles which investigate the dynamic characteristics of FPSG are primarily focused on the output performance prediction and performance optimization of the generator 13 . Chmielewski et al 14 developed a multidomain simulation model based on dynamics.…”

Section: Introductionmentioning

confidence: 99%

“…12 The articles which investigate the dynamic characteristics of FPSG are primarily focused on the output performance prediction and performance optimization of the generator. 13 Chmielewski et al 14 developed a multidomain simulation model based on dynamics. The influence of thermodynamic and dynamic parameters such as the mass of the piston and hot end temperature on the theoretical output power were analyzed which had practical information.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Prediction on onset conditions of alpha, beta, and gamma type free piston Stirling generators

Chi

Mou

Mei

et al. 2023

Energy Science & Engineering

View full text Add to dashboard Cite

The study of the onset characteristics of the free piston Stirling generator (FPSG) is essential for its development. In this study, the onset characteristics of the FPSG were discussed based on a thermodynamic model using the Routh stability criterion. First, the onset conditions of three types of FPSG, alpha, beta, and gamma, were analyzed. Then an experimental and numerical study of a 100 W beta-type FPSG prototype was conducted. The impacts on the onset temperatures of spring stiffness, charging pressure, and external load were further explored. The results demonstrate that no matter how the parameters are altered, alpha-type FPSG cannot start up. Whether beta and gamma type FPSG can start up depends on the design and operating parameters. For the prototype, as the displacer spring stiffness increases, the onset temperature rises first and then drops. When the displacer spring stiffness is 19.2 N/mm, the corresponding onset temperature is the lowest of 489 K. The FPSG is easier to start up at a higher external load and higher charging pressure. The experimental results of the impacts of the spring stiffness, charging pressure, and external load on the onset temperature agree well with the calculated results, with errors ranging from 1.7% to 9.12%. The proposed approach can play a guiding significance in studying FPSG onset conditions. K E Y W O R D Sfree piston Stirling generator, onset, Routh stability, three types | INTRODUCTIONWith the growing demand for deep space exploration, the energy system which supplies electricity for deep space exploration has emerged as a prominent topic. 1 However, due to the long distance from the sun, solar energy is sparse in deep space. 2 Nuclear energy is an ideal source for long-life-span deep space exploration. 3 An efficient, reliable, and long-life-span device is required to convert nuclear heat energy to electricity. Free piston Stirling generator (FPSG), a device that converts nuclear heat energy into electrical power, has received a lot of interest due to its high efficiency, high reliability, and long life. 4,5 The free-piston Stirling generator is one of the most typical Stirling generators, which was invented by William Beale in 1964. 6 The generator eliminates the

show abstract

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Prediction on onset conditions of alpha, beta, and gamma type free piston Stirling generators

Chi

Mou

Mei

et al. 2023

Energy Science & Engineering

View full text Add to dashboard Cite

show abstract

“…5 Stirling engines could be widely utilized in electricity applications, heat or cold sources, sinks, heat pumps, cryocoolers, refrigerating engines, prime movers, solar converters (like dish Stirling), micro combined heat and power (CHP) unitsand so forth. 6 Besides, the Stirling engine is capable to operate in a wide range of temperatures and with different fuels such as solar, bio-mass or bio-gas, waste heat or energy, natural gas, wood pellets, the exhaust gas produced by combustion processes in automotive, powerhouses, and industrial factories and so forth. 6 Due to these applications, mechanical, electrical, computer, material and metallurgical, civil, and energy engineers could attend to such a topic.…”

Section: Introductionmentioning

confidence: 99%

“…6 Besides, the Stirling engine is capable to operate in a wide range of temperatures and with different fuels such as solar, bio-mass or bio-gas, waste heat or energy, natural gas, wood pellets, the exhaust gas produced by combustion processes in automotive, powerhouses, and industrial factories and so forth. 6 Due to these applications, mechanical, electrical, computer, material and metallurgical, civil, and energy engineers could attend to such a topic.…”

Section: Introductionmentioning

confidence: 99%

Simple‐mix: Thermodynamics modeling in a Gama‐type Stirling engine with a working fluid mixture

Vaziri

Azadi

Biglari

et al. 2023

Engineering Reports

View full text Add to dashboard Cite

The Stirling engine is an external combustion engine that can be utilized in electricity generation. Existing literature indicates that air is less expensive than helium as the working fluid but has the low power and efficiency. Hence, the present updated MATLAB code attempts to use a mixture of air and helium as working fluids or other mixtures of other gases. To this end, this software proposes an experimentally validated nonideal thermodynamic model for a Gama‐type Stirling engine. After validation, a mixing gas of air and helium was used instead of an operating fluid in the thermodynamic model. Finally, three examples were run to demonstrate the software outputs for a hybrid engine.

show abstract

“…Production of clean energy without a carbon footprint is an immediate requirement and the alternative source of energy production is the future to protect the earth we know today. Free-piston Stirling engines are crankless engines, so they provide significant advantages with lower noise and vibration, longevity, low maintenance, and self-operating capabilities [3].…”

Section: Introductionmentioning

confidence: 99%

Design of a Slot-Spaced Permanent Magnet Linear Alternator Based on Numerical Analysis

Cheng

Dhanasekaran

2022

Energies

View full text Add to dashboard Cite

Linear alternators work seamlessly with Free-Piston Stirling Engines (FPSE) in the energy conversion process. This research concentrates on the design and development of a tubular slot-spaced Permanent Magnet Linear Alternator (PMLA) to be coupled with the FPSE. In an attempt to increase the power density of the machine over conventional PMLAs, a slot space is added to reduce the total mass of the stator and a parametrical study is carried out for the same. Numerically analyzing the fundamental parameters such as change of stator and magnet materials, and operating conditions frequency and stroke length. The effects of slotting are studied to understand the skinning effects on the tooth and the performance variation of the machine. A modified model is obtained to surpass 100 W from the numerical analysis of the parametric variations. Putting the machine to extreme limitations, the study conducted upon variations of parameters obtained a stable maximum power density of 186 W/kg and produced a power of 921 W for the designed PMLA. The study outlines the variation seen in the performance of the machine in such diverse conditions they go through during their life cycle.

show abstract

Free-Piston Stirling Engine Technologies and Models: A Review

Cited by 13 publications

References 85 publications

Prediction on onset conditions of alpha, beta, and gamma type free piston Stirling generators

Prediction on onset conditions of alpha, beta, and gamma type free piston Stirling generators

Simple‐mix: Thermodynamics modeling in a Gama‐type Stirling engine with a working fluid mixture

Design of a Slot-Spaced Permanent Magnet Linear Alternator Based on Numerical Analysis

Contact Info

Product

Resources

About