Effect of aspect ratio on frequency and power generation of a free-piston linear generator

Zainal, Zulkarnain; Ismael, Mhadi A.; Aziz, A. Rashid A.; Mohammed, Salah E.; Baharom, Masri B.; Firmansyah, Firmansyah; Ibrahim, M. Hanif; Sahalan, M.I.; Qawiy, Abdul

doi:10.1016/j.applthermaleng.2021.116944

Cited by 8 publications

(3 citation statements)

References 44 publications

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“…The experimental profile for pressure vs. displacement was obtained from the LG test at the Center for Automotive Research and Electric Mobility (CAREM), UTP. In that configuration, a compressor was used to induce high-pressure air up to 8 bar, initiating the combustion to assist LG motion toward the end of the stroke [23,24], whereas in the current model an atmospheric pressure (1 bar) was applied. For this reason, the pressure profile showed a curvaceous shape more than the sharp ends that are usually expected for free-piston motion.…”

Section: Final Improvements To the Fplg Model And Simulation With Dif...mentioning

confidence: 99%

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Impact of Combustion Variance on Sustainability of Free-Piston Linear Generator during Steady-State Generation

et al. 2021

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A free-piston linear generator (FPLG) has a number of advantages compared to a traditional crank-slider internal combustion engine, including better thermal and mechanical efficiencies, different fuel compatibility, and a higher power-to-weight ratio. For electric vehicle propulsion and generation of portable power, an FPLG is a very attractive alternative source of energy. This paper presents the development of an FPLG simulation model using MATLAB-Simulink and investigates the impact of combustion variance on its operation. Results provided insight into various characteristics of system behavior through variation of structural dimension and operational parameters. In steady-state operation with fixed electrical load and fixed ignition for combustion, it was found that consecutively low combustion pressures can easily lead to engine stoppage, pointing to the significance of control for continuous operation. Due to the absence of the moment of inertia and flywheel character of the rotating engine, a linear engine-generator is subject to ceased operation even after two consecutively low combustions under 10% variance. This will not be a fundamental problem in an ordinary crank-slider engine-generator, but in a linear engine-generator, control measure will be necessary to ensure sustained operation.

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Section: Final Improvements To the Fplg Model And Simulation With Dif...mentioning

confidence: 99%

“…Results showed a smaller value of velocity and emf compared to simulation results. This was related to losses due to leakage and throttling during the intake as well as friction for the experimental work [24] due to high-pressured air toward the end of the stroke [23].…”

Section: Final Improvements To the Fplg Model And Simulation With Dif...mentioning

confidence: 99%

Impact of Combustion Variance on Sustainability of Free-Piston Linear Generator during Steady-State Generation

et al. 2021

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“…Research on the power output characteristics of a freepiston engine generator mainly focused on the influence of various structural parameters of the system on the output performance. Ezrann Z. Zainal A investigated the effect of different aspect ratios (1, 1.5, and 2) on the FPLG operating frequency and power output [42] and found that the medium stroke (AR 1.5) had the best overall operating frequency of 5.25 m/s and power root mean square (RMS) 51.4 W. Chen et al investigated the three-phase, 12-slot/ 11-pole tubular linear generator equipped with a modular stator winding electromagnetic characteristics through changes in key three-dimensional ratios, such as dimensional ratios τm/τp and stator and motion ratios with an outer diameter [43]. Aziz et al explored the effect of five generator stator core configurations (GA, GB, GC, GD, and GD) on the power generation performance, generating an RSM power of 203.9 W with the GB configuration [44].…”

Section: Introductionmentioning

confidence: 99%

Performance Characteristic of Permanent Magnet Linear Generator for Energy Conversion with Renewable Fuels on Free-Piston Engines

Wei,

Zuo,

Jia

et al. 2024

International Journal of Energy Research

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Renewable fuels attract more attention owing to reduction of both air pollution and greenhouse gas emissions compared to fossil fuels. The free-piston engine generator is a new energy conversion with compact structure, multifuel combustion mode possibility, and less friction loss, and it can be applied to a variety of renewable fuels. This study investigated the effect of operating parameters on power generation and motion characteristics for free-piston engine generator. A test bench and a detailed and validated numerical model of the free-piston engine generator were presented. Results show that with the increase of the average velocity, the output power root mean square (RMS) and efficiency of the generator gradually increase. The output power RMS grows rapidly, whereas the generator efficiency gradually stabilizes. Under the same average velocity but different strokes and frequencies, the generator power and efficiency are the same. This result means that the multiple-point operating condition can achieve the same output power and generator efficiency goals. Moreover, the optimal operating conditions can be selected comprehensively, considering factors such as fuel properties, combustion efficiency, and performance. The influence of the generator on motion characteristics of the system under pure resistive load and high-frequency operation should be noted.

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Investigation on the combustion and performance characteristics of a DI free piston linear generator engine fuelled with CNG-CO2 blend

Ayandotun

Aziz

Karim

et al. 2021

Applied Thermal Engineering

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Effect of aspect ratio on frequency and power generation of a free-piston linear generator

Cited by 8 publications

References 44 publications

Impact of Combustion Variance on Sustainability of Free-Piston Linear Generator during Steady-State Generation

Impact of Combustion Variance on Sustainability of Free-Piston Linear Generator during Steady-State Generation

Performance Characteristic of Permanent Magnet Linear Generator for Energy Conversion with Renewable Fuels on Free-Piston Engines

Investigation on the combustion and performance characteristics of a DI free piston linear generator engine fuelled with CNG-CO2 blend

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