Research Papers

Dimensionless Study on Output Flow Characteristics of Expansion Energy Used Pneumatic Pressure Booster

[+] Author and Article Information
Yan Shi

e-mail: yesoyou@gmail.com

Maolin Cai

School of Automation Science
and Electrical Engineering,
Beihang University,
Beijing 100191, PRC

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the Journal of Dynamic Systems, Measurement, and Control. Manuscript received March 31, 2011; final manuscript received April 15, 2012; published online November 7, 2012. Assoc. Editor: Eric J. Barth.

J. Dyn. Sys., Meas., Control 135(2), 021007 (Nov 07, 2012) (8 pages) Paper No: DS-11-1098; doi: 10.1115/1.4007234 History: Received March 31, 2011; Revised April 15, 2012

To obtain high-pressure gas, air-driven boosters are widely used. In this paper, a new pneumatic pressure booster (named expansion energy used booster, short for EEU booster), which makes use of the expansion power of compressed air in driving chambers is proposed. To set a foundation for the study on optimization of the booster, the basic mathematical model of working processes is set up. By selecting the appropriate reference values, the basic mathematical model is transformed to a dimensionless expression for modeling simulation. In this way, the dimensionless output flow characteristics of the booster can also be found. Through analysis, it can be seen that, first, the dimensionless output flow of the booster is mainly determined by the dimensionless Piston Stroke-set (the piston stroke, when the driving chambers stopped to charge air, is defined to be Piston Stroke-set), the dimensionless output pressure of the booster and the dimensionless area of the piston in the driving chambers, the study on optimization of the booster can be done based on the analysis of the influence of the three dimensionless parameters on the dimensionless average output flow and the efficiency. Lastly, the mathematical model is verified experimentally. This research can be referred to in the design of EEU boosters and the study on optimization of the EEU booster.

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Fig. 1

Structure of EEU booster: (1) controller, (2) solenoid valve A, (3) solenoid valve B, (4) magnetic switch A, (5) magnetic switch B, (6) magnetic switch C, (7) magnetic switch D, (8) driving chamber A, (9) piston, (10) magnetic ring, (11) driving chamber B, (12) boosting chamber A, (13) piston rod, (14) boosting chamber B, (15) check valve

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Fig. 2

Piston Stroke-set of EEU booster

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Fig. 3

The forces on the piston of the booster

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Fig. 4

Motion characteristics of the piston and output flow characteristics of boosting chamber A. (a) Motion characteristics of the piston and (b) output pressure and flow of boosting chamber A.

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Fig. 5

Influence on output flow for each parameter. (a) Influence of Tf* on output flow characteristic, (b) influence of C* on output flow characteristic, (c) influence of Fs* on output flow characteristic, (d) influence of Ad* on output flow characteristic, (e) influence of Po* on output flow characteristic, (f) influence of LL* on output flow characteristic, (g) influence of Thc* on output flow characteristic, (h) influence of Thd* on output flow characteristic, (i) influence of Sb* on output flow characteristic.

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Fig. 6

Rate of change of output flow for each parameter

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Fig. 7

Output flow characteristics of the booster. (a) Relationship between output flow and LL*, (b) relationship between output flow and Po*, and (c) relation of output flow and Ad*.

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Fig. 8

Configuration of experimental apparatus: (1) regulator, (2) booster, (3) air power meter, (4) tank, (5) throttle valve, (6) data acquisition card, (7) computer

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Fig. 9

Curves of output flow of boosters

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Fig. 10

Curves of pressure of air in tank




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