Simulation of a Two-Stroke Free-Piston Engine for Electrical Power Generation

2008 ◽  
Vol 22 (5) ◽  
pp. 3443-3449 ◽  
Author(s):  
Qingfeng Li ◽  
Jin Xiao ◽  
Zhen Huang
Keyword(s):  
Power Generation ◽  
Electrical Power Generation ◽  
Electrical Power ◽  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine

scholarly journals A Reciprocating Motion Control Strategy of Single-Cylinder Free-Piston Engine Generator

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 245 ◽  
Author(s):  
Hao Yan ◽  
Zhaoping Xu ◽  
Jinkang Lu ◽  
Dong Liu ◽  
Xiaohui Jiang
Keyword(s):  
Motion Control ◽  
Control Strategy ◽  
Electrical Power ◽  
Reciprocating Motion ◽  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine ◽  
Finite State ◽  
Turning Center ◽  
Combined Simulation

Free-piston engine generator is a novel electrical power generating system developed for electric vehicles, and it is labeled as a more efficient power system than conventional engines. This paper proposes a reciprocating motion control strategy of free piston to enable the stable running of the system. The control problem was decomposed to the stroke control, the top turning center (TTC) control, and the bottom turning center (BTC) control for reducing unnecessary energy consumption during the control. An iterative learning controller (ILC) was designed for the TTC control, the BTC control was based on the combustion states estimation, and the stroke control was based on finite-state machine (FSM). The turning centers of the previous stroke and the maximum cylinder pressure of the current stroke were taken for feedback. A combined simulation model including the combustion cycle fluctuation was presented and validated by the prototype, and the performance of the control strategy was analyzed. The results showed that the system obtained the stable running and the reciprocating motion of the free piston was well controlled.

An Investigation on Power Generation Characteristics of Linear Generator Driven by a Free-piston Engine

2021 ◽  
Author(s):  
Nguyen Huynh Thi ◽  
Nguyen Van Trang ◽  
Huynh Thanh Cong ◽  
Dao Huu Huy ◽  
Huynh Van Loc ◽  
...  
Keyword(s):  
Power Generation ◽  
Piston Engine ◽  
Free Piston ◽  
Linear Generator ◽  
Free Piston Engine

Design of a Stirling Machine in a Multi-Cylinder Configuration for Microcogeneration

2012 ◽  
Author(s):  
S. Chatterton ◽  
P. Pennacchi ◽  
A. Vania ◽  
R. Ricci ◽  
A. Ghisoni
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Numerical Simulations ◽  
Electrical Power Generation ◽  
Renewable Energy Sources ◽  
Electrical Power ◽  
Energy Sources ◽  
Free Piston ◽  
Single Cylinder ◽  
Stirling Engines

At present, the attention of the market in Stirling engines is increasing for small size applications of electrical power generation. These engines are based on a simple principle of functioning and could employ renewable energy sources. Two main configurations are available on the market: the first is a four-cylinder engine with wobble yoke mechanism and the second is represented by the single-cylinder free-piston concept. The paper is aimed at investigating several multi-cylinder configurations for the improvement of the engine performances. These are evaluated by means of numerical simulations taking into account the dynamics of the mechanism and the thermal aspects of the cycle. In particular the attention of the authors is focused on the design of a new configuration with a higher number of cylinders.

scholarly journals Free-Piston Engine Design and Evaluation with Different Compression Ratios

2021 ◽  
Vol 13 (3) ◽  
pp. 57-66
Author(s):  
B. KIRUBADURAI ◽  
G. JEGADEESWARI ◽  
K. KANAGARAJA
Keyword(s):  
Heat Transfer ◽  
Fluid Dynamics ◽  
Power Generation ◽  
Operating Performance ◽  
Research Groups ◽  
Piston Engine ◽  
Free Piston ◽  
Heat Engines ◽  
Free Piston Engine ◽  
Engine Design

Free-piston heat engines are being examined by a number of international research groups as an option for conservative technology, as they are not limited by the movement of the crankshaft as in conventional engines. The free-piston engines are employed in applications like power generation using conventional methods. The higher compression ratios provide higher cycle efficiencies and also boost in-cylinder temperatures increasing mechanical stress, pressures, and heat transfer losses. This paper presents different in-cylinder flows by computational fluid dynamics for various compression ratios ranges from 7 to 15 and estimates were made to find best compression ratio for the optimal engine operating performance and characteristic.

scholarly journals Research on the Operating Characteristics of Hydraulic Free-Piston Engines: A Systematic Review and Meta-Analysis

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3530
Author(s):  
Fukang Ma ◽  
Shuanlu Zhang ◽  
Zhenfeng Zhao ◽  
Yifang Wang
Keyword(s):  
Systematic Review ◽  
High Efficiency ◽  
Meta Analysis ◽  
Combustion Process ◽  
Research Progress ◽  
Future Research ◽  
Operating Characteristics ◽  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine

The hydraulic free-piston engine (HFPE) is a kind of hybrid-powered machine which combines the reciprocating piston-type internal combustion engine and the plunger pump as a whole. In recent years, the HFPE has been investigated by a number of research groups worldwide due to its potential advantages of high efficiency, energy savings, reduced emissions and multi-fuel operation. Therefore, our study aimed to assess the operating characteristics, core questions and research progress of HFPEs via a systematic review and meta-analysis. We included operational control, starting characteristics, misfire characteristics, in-cylinder working processes and operating stability. We conducted the literature search using electronic databases. The research on HFPEs has mainly concentrated on four kinds of free-piston engine, according to piston arrangement form: single piston, dual pistons, opposed pistons and four-cylinder complex configuration. HFPE research in China is mainly conducted in Zhejiang University, Tianjin University, Jilin University and the Beijing Institute of Technology. In addition, in China, research has mainly focused on the in-cylinder combustion process while a piston is free by considering in-cylinder combustion machinery and piston dynamics. Regarding future research, it is very important that we solve the instabilities brought about by chance fluctuations in the combustion process, which will involve the hydraulic system’s efficiency, the cyclical variation, the method of predicting instability and the recovery after instability.

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