Investigation of Scavenging Process for Steady-State Operation of a Linear Internal Combustion Engine-Linear Generator Integrated System

Zang, Pengfei; Wang, Zhe; Fu, Yu; Sun, Chenle

doi:10.4271/2017-01-1087

Cited by 2 publications

(4 citation statements)

References 32 publications

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“…Trapping efficien % Scavenging efficien % IVO: intake valve opening; PVOP: port valve overlap phase; SPH: scavenging port height; EPH: exhaust port height; SAP: scavenging air pressure; OF: operating frequency. (13), 35 (14), 83 (15), 84 (16),. 85 smooth and iso-volumetric combustion process and was beneficial for the engine's efficiency.…”

Section: Performance Improvementmentioning

confidence: 99%

“…Zang et al 83 evaluated the gas exchange process of a SI loop-scavenged FP-LEG. Higher scavenging and exhaust port height were always favoured to improve scavenging efficiency.…”

Section: Linear Engine Developmentsmentioning

confidence: 99%

“… IVO: intake valve opening; PVOP: port valve overlap phase; SPH: scavenging port height; EPH: exhaust port height; SAP: scavenging air pressure;OF: operating frequency. (13), 35 (14), 83 (15), 84 (16),. 85 …”

Section: Linear Engine Developmentsmentioning

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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Section: Performance Improvementmentioning

confidence: 99%

“…Zang et al 83 evaluated the gas exchange process of a SI loop-scavenged FP-LEG. Higher scavenging and exhaust port height were always favoured to improve scavenging efficiency.…”

Section: Linear Engine Developmentsmentioning

confidence: 99%

See 1 more Smart Citation

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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“…Xie et al performed the numerical simulation of an Opposed-Piston 2-Stroke Diesel Engine (OP2S) and compared the results of in-cylinder gas motion with those of a uniflow-scavenged two-stroke engine using CFD engine models [18]. Zang et al investigated the scavenging process of Linear Internal Combustion Engine-Linear Generator Integrated System (LICELGIS) and implemented a steady-state verification test to further explore the motion characteristics of LICELGIS [19]. Mattarelli et al reported a CFD study on a two-stroke Opposed Piston High Speed Direct Injection Diesel Engine (OPHSDI) and analyzed the influence of the offset between the crankshafts by performing 3D CFD simulations [20].…”

Section: Introductionmentioning

confidence: 99%

Scavenging Ports’ Optimal Design of a Two-Stroke Small Aeroengine Based on the Benson/Bradham Model

et al. 2018

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The two-stroke engine is a common power source for small and medium-sized unmanned aerial vehicles (UAV), which has wide civil and military applications. To improve the engine performance, we chose a prototype two-stroke small areoengine, and optimized the geometric parameters of the scavenging ports by performing one-dimensional (1D) and three-dimensional (3D) computational fluid dynamics (CFD) coupling simulations. The prototype engine is tested on a dynamometer to measure in-cylinder pressure curves, as a reference for subsequent simulations. A GT Power simulation model is established and validated against experimental data to provide initial conditions and boundary conditions for the subsequent AVL FIRE simulations. Four parameters are considered as optimal design factors in this research: Tilt angle of the central scavenging port, tilt angle of lateral scavenging ports, slip angle of lateral scavenging ports, and width ratio of the central scavenging port. An evaluation objective function based on the Benson/Bradham model is selected as the optimization goal. Two different operating conditions, including the take-off and cruise of the UAV are considered. The results include: (1) Orthogonal experiments are analyzed, and the significance of parameters are discussed; (2) the best factors combination is concluded, followed by simulation verification; (3) results before and after optimization are compared in details, including specific scavenging indexes (delivery ratio, trapping efficiency, scavenging efficiency, etc.), conventional performance indicators, and the sectional views of gas composition distribution inside the cylinder.

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Investigation of Scavenging Process for Steady-State Operation of a Linear Internal Combustion Engine-Linear Generator Integrated System

Cited by 2 publications

References 32 publications

Recent progress on performance and control of linear engine generator

Recent progress on performance and control of linear engine generator

Scavenging Ports’ Optimal Design of a Two-Stroke Small Aeroengine Based on the Benson/Bradham Model

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