Research on Piston Dynamics and Engine Performances of a Free-Piston Engine Linear Generator Coupling with Various Rebound Devices
Author:
Guo Chendong12, Wang Yahui1, Tong Liang1, Feng Huihua2, Zuo Zhengxing2, Jia Boru23ORCID
Affiliation:
1. College of Electrical and Mechanical Engineering, Beijing Information Science and Technology University, Beijing 100192, China 2. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China 3. Department of Engineering, Durham University, Durham DH1 3LE, UK
Abstract
Free-piston engine linear generators (FPELGs) are an innovative linear power device that exhibits the distinctive dynamics of pistons and performance of free-piston engines. Furthermore, the single-cylinder/single-piston FPELG structure type has more advantages than other FPELG structure types, including a straightforward structure and ease of control. However, when coupled with various rebound devices, the operational characteristics and piston and engine performance of single-cylinder/single-piston FPELGs are quite different. Therefore, this paper aims to quantitatively compare the dynamics of the piston and engine performance of single-cylinder/single-piston FPELGs coupled with various types of rebound device. The results indicate that when the equivalent stiffness of the gas spring is greater than that of the mechanical spring, the operating frequency of the piston of the FPELG coupled with a gas spring will be higher than that when coupled with a mechanical spring. During the compression stroke, the piston velocity of a FPELG coupled with a mechanical spring changes linearly, while the piston velocity of a FPELG coupled with a gas spring changes nonlinearly. FPELGs coupled with gas springs have shorter compression and expansion durations compared to those coupled with mechanical springs. In addition, the indicated powers of FPELGs coupled with ideal gas springs and mechanical springs are 1.5 kW and 1.3 kW, respectively. However, due to leakage, the thermal efficiency of a FPELG coupled with an actual gas spring is reduced by approximately 2.5% compared with the FPELG coupled with the ideal gas spring. Furthermore, the operation frequency of the piston is positively correlated with the stiffness of the mechanical spring. In addition, as the stiffness of the mechanical spring increases, the combustion process of the engine becomes close to an isovolumetric process. The changes in piston dynamics and engine performance when increasing the initial gas pressure of the gas spring are similar to those when increasing the stiffness of the mechanical spring.
Funder
R&D Program of Beijing Municipal Education Commission
Subject
Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction
Reference42 articles.
1. Irie, S., Sato, M., Mizuno, T., Nishimura, F., and Naganuma, K. (2022). Effect of Nonlinear Spring Characteristics on the Efficiency of Free-Piston Engine Generator. Energies, 15. 2. Miao, Y., Zuo, Z., Feng, H., Guo, C., Song, Y., Jia, B., and Guo, Y. (2016). Research on the Combustion Characteristics of a Free-Piston Gasoline Engine Linear Generator during the Stable Generating Process. Energies, 9. 3. Non-Linear and Multi-Domain Modelling of a Permanent Magnet Linear Synchronous Machine for Free Piston Engine Generators;Brosnan;Energy Convers. Manag. X,2022 4. Review of Recent Advances of Free-Piston Internal Combustion Engine Linear Generator;Guo;Appl. Energy,2020 5. A Review of Free-Piston Linear Engines;Hung;Appl. Energy,2016
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