THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Yu Liu

,

Jinlong Wang

,

Jin Xiao

,

Zhen Huang

EXPERIMENTAL RESEARCH OF AN INTEGRATED SCAVENGING PUMP COUPLED WITH A BUFFER TANK FOR A FREE-PISTON ENGINE

ABSTRACT
Free-piston engine is considered one of the potential range extenders for hybrid vehicles because of its high thermal efficiency, low mechanical loss, and ultimate fuel flexibility. The performance of scavenging devices or structures is critical of two-stroke free-piston engine stable operation. This paper aims to explore the operating characteristics of an integrated scavenging pump coupled with a buffer tank under different operating conditions to promote the application of scavenging pumps on free-piston engines. Hence, a detailed contrast experiment is performed to investigate the effect of the buffer tank volume, discharge position and deflated pressure on the scavenging pump performance. By analysing the experimental results, a weighting score system is employed in deciding the most appropriate buffer tank for the application. The CFD calculation of the gas exchanging process to validate the feasibility of the selected scavenging pump parameters. In addition, the influence of buffer tank pressure on combustion is evaluated via scavenging combustion tests. The experiment results show that the maximum in-cylinder pressure can reach 47.44 bar when the buffer tank pressure 165 kPa.
KEYWORDS
free piston engine, Scavenging pump, Buffer tank, pressure fluctuation
PAPER SUBMITTED: 2024-06-08
PAPER REVISED: 2024-07-07
PAPER ACCEPTED: 2024-07-12
PUBLISHED ONLINE: 2024-08-31
DOI REFERENCE: https://doi.org/10.2298/TSCI240608200L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2025, VOLUME 29, ISSUE Issue 2, PAGES [861 - 871]
REFERENCES
  1. Kazi, M.-K., et al., Green Hydrogen For Industrial Sector Decarbonization: Costs and Impacts on Hydrogen Economy in Qatar, Comput. Chem. Eng., 145 (2021), 107144
  2. Dillman, K., et al., Decarbonization Scenarios for Reykjavik's Passenger Transport: The Combined Effects of Behavioural Changes and Technological Developments, Sustain., Cities Soc., 65 (2021), 102614
  3. Zhou, Y., et al., A System-Level Numerical Study of a Homogeneous Charge Compression Ignition Spring-Assisted Free Piston-Linear Alternator with Various Piston Motion Profiles, Applied Energy, 239 (2019), Apr., pp. 820-35
  4. Haag, J., et al., Numerical and Experimental Investigation of in-Cylinder Flow in a Loop-Scavenged Two-Stroke Free Piston Engine, SAE Technical Paper, 2013-24-0047, 2013
  5. Kock, F., et al., The Free Piston-Linear Generator-Development of an Innovative, Compact, Highly Efficient Range-Extender Module, SAE Technical Paper, 2013-01-1727, 2013
  6. Haag, J., et al., Development Approach for the Investigation of Homogeneous Charge Compression Ignition in a Free-Piston Engine, SAE Technical Paper, 2013-24-0047, 2013
  7. Kosaka, H., et al., Development of Free Piston Engine Linear Generator System Part 1 - Investigation of Fundamental Characteristics, SAE Technical Paper, 2014-01-1203, 2014
  8. Goto, S., et al., Development of Free Piston Engine Linear Generator System Part 2 - Investigation of Control System for Generator, SAE Technical Paper, 2014-01-1193, 2014
  9. Moriya, K., et al., Development of Free Piston Engine Linear Generator System Part 3 - Novel Control Method of Linear Generator for to Improve Efficiency and Stability, SAE Technical Paper, 2016-01-0685, 2016
  10. Mikalsen, R., Roskilly, A., Coupled Dynamic-Multidimensional Modelling of Free-Piston Engine Combustion, Applied Engineering, 86 (2009), 1, pp. 89-95
  11. Mikalsen, R., Roskilly, A., Performance Simulation of a Spark Ignited Free-Piston Engine Generator, Applied Thermal Engineering, 28 (2008), 14-15, pp. 1726-33
  12. Mikalsen, R., Roskilly, A., The Design and Simulation of a Two-Stroke Free-Piston Compression Ignition Engine for Electrical Power Generation, Applied Thermal Engineering, 28 (2008), 5-6, pp. 589-600
  13. Feng, H., et al., Study of the Injection Control Strategies of a Compression Ignition free Piston Engine Linear Generator in a One-Stroke Starting Process, Energies, 9 (2016), 6, 453
  14. Zhang, Z., et al., Research on the Engine Combustion Characteristics of a Free-Piston Diesel Engine Linear Generator, Energy Conversion and Management, 168 (2018), July, pp. 629-38
  15. Mao, J., et al., Parameters Coupling Designation of Diesel Free-Piston-Linear Alternator, Applied Energy, 88 (2011), 12, pp. 4577-89
  16. Carter, D., Wechner, E., The Free Piston Power Pack: Sustainable Power for Hybrid Electric Vehicles, SAE Technical Paper, 2003-01-3277, 2003
  17. Yan H, et al., A Reciprocating Motion Control Strategy of Single-Cylinder Free-Piston Engine Generator, Electrnics, 9 (2020), 2, 245
  18. Mao, J., et al., Multi-Dimensional Scavenging Analysis of a Free-Piston-Linear Alternator Based on Numerical Simulation, Applied Energy, 88 (2011), 4, pp. 1140-1152
  19. Ismael, M. A., et al., Effect of Aspect Ratio on Frequency And Power Generation of a Free-Piston-Linear Generator, Applied Thermal Engineering, 192 (2021), 116944
  20. Chiang, C.-J., et al., Dynamic Modelling of a SI/HCCI free-Piston Engine Generator with Electric Mechanical Valves, Applied Energy, 102 (2013), Feb., pp. 336-46
  21. Yuan, S., et al., Simulation Study of a Two-Stroke Single Piston Hydraulic Free Piston Engine, 2008 Asia Simulation Conference, Proceedings, 7th International Conference on System Simulation and Scientific Computing, Beijing, China, 2008
  22. Giglio, V., et al. Analysis of Advantages and of Problems of Electromechanical Valve Actuators, SAE Transactions, 111 (2002), Section 3, pp. 1768-1779
  23. Jia, B., et al., A Decoupled Design Parameter Analysis for Free-Piston Engine Generators, Energies, 10 (2017), 4, 486
  24. Zhu, C., Research on Single-Piston Free Piston-Linear Generator System (in Chinese), M. Sc. thesis, Shanghai Jiao Tong University, Shanghai, China, 2019
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Experimental research of an integrated scavenging pump coupled with a buffer tank for a free-piston engine

2025 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence