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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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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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