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

Ayandotun, Wasiu B.; Aziz, A. Rashid A.; Karim, Zainal Ambri B. A.; Mohammed, Salah E.; Zainal, Zulkarnain; Raheem, Ahmed T.; Ismael, Mhadi A.

doi:10.1016/j.applthermaleng.2021.117441

Cited by 14 publications

(5 citation statements)

References 34 publications

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“…In general, types of the linear FPEs were classified into: single-piston, two-piston (i.e., opposed-piston or dualpiston), and four-piston (i.e., complicated piston configuration, opposed-piston combined with dualpiston) as illustrated in Figure 2, 4,31,32,33) .…”

Section: Free-piston Engine Configurationsmentioning

confidence: 99%

Combustion Characteristics of a Free Piston Engine Linear Generator using Various Fuel Injection Durations

Raheem¹,

Aziz²,

Zulkifli³

et al. 2023

Evergreen

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A free piston engine linear generator (FPELG) is considered a type of contemporary technology for energy conversion. The main features of FPELG are less emission, few parts i.e., less friction, and high efficiency. However, because the FPELG does not have a crankshaft, critical issues e.g., combustion efficiency, and performance were reported. This study examines the influence of various fuel injection durations (FID) on combustion behaviors. According to the results of the experiments, as the time increased of the fuel injection, the in-cylinder pressure and translator velocity both slightly grew. The highest work output and combustion efficiency were at FID17 and FID 14 ms, respectively. Thus, FID plays a significant role to improve FPELG performance and optimal fuel duration is required.

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Section: Free-piston Engine Configurationsmentioning

confidence: 99%

Combustion Characteristics of a Free Piston Engine Linear Generator using Various Fuel Injection Durations

Raheem¹,

Aziz²,

Zulkifli³

et al. 2023

Evergreen

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“…Newcastle University investigated the performance of a loop-scavenged hydrogen-fuelled DPP FP-LEG in two-stroke and four-stroke modes. 50 The four-stroke 45 2, 30 3, 51 4, 46,47 5, 55 6, 36,37 7, 42 8, 50 9, 25 10, 48,59 11, 57 12. 54 cycle was achieved with active valve operation, and the alternator was the controller used to guide the piston according to a pre-set displacement profile.…”

Section: Toyota Central Research and Development Labsmentioning

confidence: 99%

“…86 Universiti Teknologi PETRONAS successfully operated a SPP FP-LEG fuelled with CNG and CO 2 blend. 55 Combustion and performance improved with advanced injection and rich mixture. The piston velocity during compression was lower than during expansion, suggesting that the bounce chamber would need improvement, and the fuel combustion efficiency was low, about 30%.…”

Section: Performance Improvementmentioning

confidence: 99%

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Recent progress on performance and control of linear engine generator

Ngwaka

Chen

Qiu

et al. 2022

International Journal of Engine Research

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Linear engines, or widely called free piston engines, have their advantages compared to conventional engines with crankshafts, for example, lower friction loss, compact structure, fuel adaptability, flexible compression ratio, etc. Among the linear engine conceptual designs and prototypes, Linear Engine Generator (LEG) incorporating a linear engine (internal or external combustion) and a linear alternator provides an alternative and attractive solution for hybrid electrical powertrains in transport applications. Due to the advantages of linear engines, hydrogen, synthetic hydrogen carrier fuels and biofuels are easier to adopt on LEG, making it an appealing technology for decarbonisation. This paper explicitly reviews LEG research and development on state-of-art solutions and recent progress in linear engine improvement, linear alternator design optimisation, and integrated LEG system control. Key performance indicators of the linear engine generator, like power output, thermal and electrical efficiency, etc., are summarised to present a general picture of up-to-date LEG development. Recommendations for further LEG development are provided at the end of the paper regarding the review outcomes.

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“…The extraction and use of fossil fuels stress natural resources, leading to environmental degradation, including the depletion and disruption of water resources and land use. Therefore, the renewable fuels are widely investigated by researchers, such as hydrogen and ammonia, to replace fossil fuels [5][6][7][8].…”

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

Cited by 14 publications

References 34 publications

Combustion Characteristics of a Free Piston Engine Linear Generator using Various Fuel Injection Durations

Combustion Characteristics of a Free Piston Engine Linear Generator using Various Fuel Injection Durations

Recent progress on performance and control of linear engine generator

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

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