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Research Papers: Fundamental Issues and Canonical Flows

Semi-Empirical Study of Water Flow Through Vortex Triodes and Performance Optimization

[+] Author and Article Information
Guido Belforte

Department of Mechanical
and Aerospace Engineering,
Politecnico di Torino,
Corso Duca degli Abruzzi, 24,
Torino 10129, Italy
e-mail: guido.belforte@polito.it

Andrea Manuello Bertetto

Department of Mechanical,
Chemical, and Materials Engineering,
Università degli Studi di Cagliari,
Piazza D'Armi, Cagliari 09123, Italy
e-mail: andrea.manuello@unica.it

Luigi Mazza

Department of Mechanical
and Aerospace Engineering,
Politecnico di Torino,
Corso Duca degli Abruzzi, 24,
Torino 10129, Italy
e-mail: luigi.mazza@polito.it

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received February 3, 2015; final manuscript received June 8, 2015; published online August 12, 2015. Assoc. Editor: Daniel Maynes.

J. Fluids Eng 137(12), 121203 (Aug 12, 2015) (11 pages) Paper No: FE-15-1089; doi: 10.1115/1.4031017 History: Received February 03, 2015

A study was carried out to evaluate behavior and performance of vortex triodes. In particular, the study investigated the geometries and operating conditions which minimize the control flow capable of intercepting the supply flow. The study was conducted experimentally using a specially designed test bench on prototypes operating with water. The geometric parameters which influence vortex valve performance were identified and varied so as to minimize the ratio between control and supply flows. The paper presents a semi-empirical formula to predict vortex valve performance. In particular, the formula takes valve outlet geometry and the shape of outlet diffusers into account.

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References

Wormley, D. N. , and Richardson, H. H. , 1970, “A Design Basis for Vortex-Type Fluid Amplifiers Operating in the Incompressible Flow Regime,” ASME J. Basic Eng., 92(2), pp. 369–376. [CrossRef]
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MacGregor, S. A. , and Syred, N. , 1982, “Effect of Outlet Diffusers on Vortex Amplifier Characteristics,” Fluid. Q., 14, pp. 1–11.
Frith, P. C. W. , and Duggins, R. K. , 1986, “Flow Modulation in Turbulent Vortex Chambers,” 9th Australasian Fluid Mechanics Conference, Auckland, New Zealand, pp. 338–341.
Tippets, J. R. , and Priestman, G. H. , 1988, “Detail and Strategy in Fluidic Developments for the Nuclear Industry,” 2nd Conference on Fluid Control, Measurement, Mechanics and Flow Visualization, Sheffield, UK, pp. 124–128.
Tippets, J. R. , 1997, “Multi-Switched Vortex Valves,” 5th Conference on Fluid Control, Measurement and Visualisation, T. Kobayashi, ed., Hayama, Japan, Vol. 2, pp. 523–528.
Tippets, J. R. , and Priestman, G. H. , 2003, “Water Displays Using Fluidic Vortex Valves,” 7th Conference on Fluid Control, Measurement and Visualisation, G. M. Carlomagno and I. Grant eds., Sorrento, Italy, pp. 1–12.
Woolhouse, R. J. , Tippets, J. R. , and Beck, S. B. M. , 2001, “A Comparison of the Experimental and Computational Modelling of the Fluidic Turn-Up Vortex Amplifier at Full and Zero Swirl Conditions,” Proc. Inst. Mech. Eng., Part C, 215(8), pp. 893–903. [CrossRef]
Birch, M. J. , Doig, R. , Francis, J. , Parker, D. , and Zhang, G. , 2009, “A Review of Vortex Amplifier Design in the Context of Sellafield Nuclear Operations,” ASME Paper No. ICEM2009-16063.
Parker, D. , Birch, M. J. , and Francis, J. , 2011, “Computational Fluid Dynamic Studies of Vortex Amplifier Design for the Nuclear Industry—I. Steady-State Conditions,” ASME J. Fluids Eng., 133(4), p. 041103. [CrossRef]
Francis, J. , Birch, M. J. , and Parker, D. , 2012, “Computational Fluid Dynamic Studies of Vortex Amplifier Design for the Nuclear Industry—II. Transient Conditions,” ASME J. Fluids Eng., 134(2), p. 021103. [CrossRef]
Francis, J. , Parker, D. , Whitty, J. , and Zhang, G. , 2014, “Control Port Influence on Swirl, Operating, and Flow Characteristics of a Mini-Vortex Amplifier on Glove Box Service,” ASME J. Fluids Eng., 136(12), p. 121104. [CrossRef]
Letham, D. L. , 1966, “Fluidic System Design—Vortex Amplifiers,” Mach. Des., pp. 178–181.
Belforte, G. , Manuello Bertetto, A. , and Mazza, L. , 1994, “Analysis of Vortex Valves for Minimizing Control Flow,” 4th Conference on Fluid Control, Measurement and Visualisation, Toulouse, France, pp. 757–762.
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Figures

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Fig. 1

Basic triode schematics and mixing mechanism

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Fig. 2

Test bench schematics

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Fig. 3

Valve A4⊥2E, four supply and control ports, double outlet and diffusers

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Fig. 4

TDR of valves with a single control port

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Fig. 5

Influence of control area on valve A1=F performance

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Fig. 6

TDR behavior versus ratio RF/DE

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Fig. 7

CPR behavior versus ratio RF/DE

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Fig. 8

TDR behavior for double-outlet valve with diffusers

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Fig. 9

Comparison of vortex valve characteristics

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Fig. 10

TDR performance versus variation in outlet diameter DE

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Fig. 11

Vortex in cutoff condition, visualized with air bubbles

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Fig. 12

Main and counter-rotating peripheral vortex in intermediate operating condition, air bubbles

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Fig. 13

Main vortex in cutoff condition and fluid flow back to the supply port

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