0
Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Thermodynamic Simulation and Prototype Testing of a Four-Stroke Free-Piston Engine

[+] Author and Article Information
Jiming Lin

School of Mechanical Engineering,
Nanjing University of Science and Technology,
Xuanwu District,
Nanjing 210094, China
e-mail: jiming.lin@hotmail.com

Zhaoping Xu

School of Mechanical Engineering,
Nanjing University of Science and Technology,
Xuanwu District,
Nanjing 210094, China
e-mail: xuzp@njust.edu.cn

Siqin Chang

School of Mechanical Engineering,
Nanjing University of Science and Technology,
Xuanwu District,
Nanjing 210094, China
e-mail: changsiqin@hotmail.com

Ningxia Yin

School of Mechanical Engineering,
Nanjing University of Science and Technology,
Xuanwu District,
Nanjing 210094, China
e-mail: yinningxia2002@hotmail.com

Hao Yan

School of Mechanical Engineering,
Nanjing University of Science and Technology,
Xuanwu District,
Nanjing 210094, China
e-mail: 175380552@qq.com

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 19, 2013; final manuscript received December 7, 2013; published online January 9, 2014. Assoc. Editor: Song-Charng Kong.

J. Eng. Gas Turbines Power 136(5), 051505 (Jan 09, 2014) (8 pages) Paper No: GTP-13-1267; doi: 10.1115/1.4026299 History: Received July 19, 2013; Revised December 07, 2013

In order to achieve higher-energy conversion efficiency, a free-piston engine with an improved four-stroke thermodynamic cycle is investigated in this paper. This cycle is optimized according to the variable strokes feature and is characterized by the short intake stroke, the complete expansion stroke, the external pressurization, and the intercooling. The development of a four-stroke free-piston engine system simulation model was described, and the effects of the cycle on the system performances were qualitatively analyzed. According to the experiment of the prototype, the generating efficiency of 33.4% can be achieved when the system is fueled with gasoline and the output power is significantly increased from 1.62 to 2.68 kW. The simulation and experiment results are analyzed in detail, giving insight into the performances of the system. Studies show that the energy-saving and environmental protection performances of the system can be significantly promoted by using the improved thermodynamic cycle.

FIGURES IN THIS ARTICLE
<>
Copyright © 2014 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

Functional schematic of the ICLG

Grahic Jump Location
Fig. 2

The improved four-stroke thermodynamic cycle

Grahic Jump Location
Fig. 3

The forces balance of the piston assembly

Grahic Jump Location
Fig. 4

The control sketch of the system

Grahic Jump Location
Fig. 5

Piston motion comparisons between the proposed system and conventional engine

Grahic Jump Location
Fig. 6

Predicted in-cylinder gas pressure and pressure rise rate

Grahic Jump Location
Fig. 7

Predicted in-cylinder gas temperature and heat transfer coefficient

Grahic Jump Location
Fig. 8

The effective efficiency and electric power of different intake air pressures

Grahic Jump Location
Fig. 9

In-cylinder gas pressure of different intake air pressures

Grahic Jump Location
Fig. 10

In-cylinder gas temperature of different intake air pressures

Grahic Jump Location
Fig. 11

The prototype of the ICLG

Grahic Jump Location
Fig. 12

The electric power output of the ICLG

Grahic Jump Location
Fig. 13

In-cylinder gas pressure of different intake air pressures with the same air inflow

Grahic Jump Location
Fig. 14

In-cylinder gas pressure of different intake air pressures with the same intake stroke length

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In