0
Technical Brief

Dimensionless Study on Efficiency and Speed Characteristics of a Compressed Air Engine

[+] Author and Article Information
Qihui Yu

School of Automation Science and Electrical Engineering,
Beijing University of Aeronautics and Astronautics,
XueYuan Road No. 37,
HaiDian District,
Beijing 100191, China
e-mail: yqhhxq@163.com

Maolin Cai

School of Automation Science and Electrical Engineering,
Beijing University of Aeronautics and Astronautics,
XueYuan Road No. 37,
HaiDian District,
Beijing 100191, China
e-mail: caimaolin@gmail.com

Yan Shi

School of Automation Science and Electrical Engineering,
Beijing University of Aeronautics and Astronautics,
XueYuan Road No. 37,
HaiDian District,
Beijing 100191, China
e-mail: yesoyou@163.com

Chi Yuan

School of Automation Science and Electrical Engineering,
Beijing University of Aeronautics and Astronautics,
XueYuan Road No. 37,
HaiDian District,
Beijing 100191, China
e-mail: okokok1990@163.com

1Corresponding author.

Contributed by the Internal Combustion Engine Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 20, 2014; final manuscript received January 21, 2015; published online March 9, 2015. Assoc. Editor: Avinash Kumar Agarwal.

J. Energy Resour. Technol 137(4), 044501 (Jul 01, 2015) (9 pages) Paper No: JERT-14-1222; doi: 10.1115/1.4029867 History: Received July 20, 2014; Revised January 21, 2015; Online March 09, 2015

To eliminate the pollutants exhausting, this paper presents an idea of using compressed air as the power source for engines. Instead of an internal combustion (IC) engine, this automobile is equipped with a compressed air engines (CAEs), which transforms the energy of the compressed air into mechanical kinematic energy. Through analysis of the working process of a CAE, the mathematical model is setup. Experiments are carried out to verify the engine performance and the basic model’s validity. By selecting the appropriate reference values, the mathematical model is transformed to a dimensionless expression. The dimensionless speed and efficiency characteristics of the CAE are obtained. Through analysis, it can be obtained that the dimensionless average rotating speed is mainly determined by the intake duration angle, the dimensionless inertia parameter, the dimensionless exhaust pressure, and the scale factor of exhaust valve. Moreover, the efficiency of the CAE is mainly determined by the dimensionless exhaust pressure, the intake duration angle and the dimensionless cylinder clearance. This research can be referred to in the design of CAE and the study on optimization of the CAE.

FIGURES IN THIS ARTICLE
<>
Copyright © 2015 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

Structure of the single cylinder CAE

Grahic Jump Location
Fig. 2

The ideal schematic diagram of CAE system

Grahic Jump Location
Fig. 3

Engine and load model

Grahic Jump Location
Fig. 4

The relationship between the maximum effective cross-sectional and piston area

Grahic Jump Location
Fig. 5

Configuration of experimental apparatus: (1) compressor, (2) buffer bank, (3) pressure regulator, (4) intake pressure sensor, (5) cylinder pressure sensor, (6) CAE, (7) coupling, (8) eddy current dynamometer, and (9) data acquisition system

Grahic Jump Location
Fig. 6

Curves of output torque, output power variation in different intake pressure

Grahic Jump Location
Fig. 7

Curves of cylinder pressure

Grahic Jump Location
Fig. 8

Working cycle for CAE

Grahic Jump Location
Fig. 9

Speed and efficiency characteristics of CAE

Grahic Jump Location
Fig. 10

Rate of change of speed and efficiency for each parameter

Grahic Jump Location
Fig. 11

Rotating speed characteristics of the CAE. (a) Relationship between rotating speed and tf*, (b) relationship between speed and θ1, (c) relationship between rotating speed and pa*, and (d) relationship between speed and τ2.

Grahic Jump Location
Fig. 12

Efficiency characteristics of the CAE. (a) Relationship between efficiency and pa*, (b) relationship between efficiency and θ1, (c) relationship between efficiency and Vc*.

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