Research Papers: Gas Turbines: Structures and Dynamics

Characterization of Limacon Gas Expanders With Consideration to the Dynamics of Apex Seals and Inlet Control Valve

[+] Author and Article Information
Truong H. Phung

Faculty of Science and Technology,
School of Engineering,
Federation University Australia,
University Drive,
Mount Helen 3350, Victoria, Australia
e-mail: t.phung@federation.edu.au

Ibrahim A. Sultan

Faculty of Science and Technology,
School of Engineering,
Federation University Australia,
University Drive,
Mount Helen 3350, Victoria, Australia
e-mail: i.sultan@federation.edu.au

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received January 3, 2018; final manuscript received May 16, 2018; published online August 6, 2018. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(12), 122501 (Aug 06, 2018) (11 pages) Paper No: GTP-18-1005; doi: 10.1115/1.4040418 History: Received January 03, 2018; Revised May 16, 2018

Limaçon machine, of which the relative motion between the rotor and housing follows the limaçon curve, belongs to a class of rotary positive displacement machines. The profiles of rotors and housings of those machines can be constructed of either limaçon or circular curves, hence the names: limaçon-to-limaçon, circolimaçon, and limaçon-to-circular machines. This paper presents the investigation into the thermodynamic performance of the limaçon-to-circular machines with the presence of apex seals and inlet valve. This paper sets out by briefly introducing the limaçon technology and the construction of the limaçon-to-circular machine working volume. The mathematical descriptions of ports' positions and areas have also been introduced. The paper then discusses the flow and phase composition of working fluid through the working chambers as well as how the fluid velocity is modeled and calculated. Then the seal dynamic model and response of inlet valve are presented followed by the machine thermodynamic model. A case study has also been presented to show the responses of seals and inlet valve during the machine operation.

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Fig. 1

A limaçon-to-circular expander

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Fig. 2

The limaçon-to-circular port area

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Fig. 3

Kinematics of apex seal

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Fig. 4

Seal dynamics—the elastic contact approach

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Fig. 5

Design of an inlet valve

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Fig. 6

Solenoid control voltage

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Fig. 7

Chamber pressure and temperature against crank angle

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Fig. 8

Limaçon machine pressure-volume diagram

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Fig. 9

The effect of antechamber volume to the working chamber pressure at various rpm

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Fig. 10

Valve opening against rotor angle at various rpm and V3

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Fig. 11

Solenoid currents at one particular rpm

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Fig. 12:

Seal displacements and seal-housing force at 800 rpm and V3=2.85Vmax

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Fig. 13

Seal displacements and seal-housing force at 1800 rpm and V3=2.85Vmax

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Fig. 14

Limaçon machine overall efficiencies at different rpm and V3



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