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Technical Briefs

Theoretical Analysis of an Original Rotary Machine

[+] Author and Article Information
Giovanni Bonandrini1

Dipartimento di Meccanica Strutturale, Università degli Studi di Pavia, Via Ferrata 1, I-27100 Pavia, Italygiovanni.bonandrini@unipv.it

Giovanni Mimmi

Dipartimento di Meccanica Strutturale, Università degli Studi di Pavia, Via Ferrata 1, I-27100 Pavia, Italygiovanni.mimmi@unipv.it

Carlo Rottenbacher

Dipartimento di Meccanica Strutturale, Università degli Studi di Pavia, Via Ferrata 1, I-27100 Pavia, Italyrottenbacher@unipv.it

1

Corresponding author.

J. Mech. Des 132(2), 024501 (Jan 06, 2010) (8 pages) doi:10.1115/1.4000698 History: Received April 04, 2009; Revised November 17, 2009; Published January 06, 2010; Online January 06, 2010

In this study an original analysis of the geometric design of a particular internal rotary machine and an investigation on its theoretical performances are presented. The first part of the work is focused on the geometry of the machine, characterized by more complex rotor profiles compared with the classical epitrochoidal pumps. Suitable parameters are pointed out to completely define the geometry of the machine. In the second part of the study, proper indices are set and evaluated as functions of the design parameters, in order to evaluate the performance of the machine. Finally a specific configuration of the considered pump is compared with the conventional trochoidal pumps in terms of flow-rate indices. The analysis performed allows one to highlight the basic advantages and drawbacks of this original design in comparison with the classical trochoidal profiles and can be used as a basis for CAD/CAE (Computer-Aided Design and Engineering) or experimental studies.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Reference systems used for the considered machine

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Figure 2

External rotor profile

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Figure 3

Conjugated trochoidal profiles: undercutting conditions

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Figure 4

Conjugated trochoidal profile sections

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Figure 5

Envelopes of the external profile

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Figure 6

Contact points in correspondence of the maximum volume of the chamber

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Figure 7

Functional zones of the pump

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Figure 8

Zone A, anticlockwise rotation, contact points

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Figure 9

Flow-rate computation: (a) maximum volume of the chamber and (b) minimum volume of the chamber

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Figure 10

Flow-rate of the considered pump. Geometrical parameters: e=10 mm, n1=11; αAB=2.75; αBC=6; αDC=0.05; βAB=11.25; and βCD=13.25.

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Figure 11

Best irregularity configuration, n1=11

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