Investigation of the Plunging Pressure Pulsation in a Swirling Flow with Precessing Vortex Rope in a Straight Diffuser
Sebastian Muntean,Constantin Tanasa,Alin Bosioc,D. C. Moş +3 more
- Vol. 49, Iss: 8, pp 082010
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The article was published on 2016-11-01 and is currently open access. It has received 11 citations till now. The article focuses on the topics: Diffuser (thermodynamics).read more
Citations
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Journal ArticleDOI
Origin of the synchronous pressure fluctuations in the draft tube of Francis turbines operating at part load conditions
TL;DR: In this article, the authors investigated the birth and the growth of the synchronous pressure wave in Francis turbines by energy consideration of an azimuthal-temporal Fourier decomposition of the three dimensional numerical flow solutions in an axisymmetric draft tube geometry that is slightly disturbed at the wall.
Journal ArticleDOI
Experimental Investigation of the Unsteady Pressure Field in Decelerated Swirling Flow with 74° Sharp Heel Elbow
TL;DR: In this article, it was shown that a plunging component of 8 Hz corresponds to a 74° heel elbow in the Fourier spectra for the conical diffuser with the vortex rope and it second harmonic.
Journal ArticleDOI
Influence of the Reshaped Elbow on the Unsteady Pressure Field in a Simplified Geometry of the Draft Tube
TL;DR: In this paper, the influence of the reshaped elbow geometry of the draft tube on the unsteady pressure field under different operating conditions was investigated, considering two simplified geometrical configurations of the tube with sharp heel elbow and modified/reshaped elbow, respectively.
Journal ArticleDOI
On the generation mechanisms of low-frequency synchronous pressure pulsations in a simplified draft-tube cone
TL;DR: In this paper , the authors focus on the generation mechanisms of synchronous pressure pulsations featuring a lower frequency than the rotating frequency of a vortex core which are observed in a simplified draft-tube cone through analyzing the results of experiments along with unsteady-state numerical simulations.
Experimental Investigation of Unsteady Pressure Pulsation in New Type Dishwasher Pump with Special Double-Tongue Volute
TL;DR: In this article, a volute reference scheme with passive rotation was proposed, which can effectively improve the flow pattern and reduce pressure inside the dishwasher pump and also provide a new idea for rotor-rotor interference to guide the innovation of dishwashers.
References
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BookDOI
Flow-Induced Pulsation and Vibration in Hydroelectric Machinery : Engineer’s Guidebook for Planning, Design and Troubleshooting
TL;DR: The Lovejoy Coupling Handbook Lovejoy a Timken company two-equation eddy-viscosity turbulence models for List of abbreviations in oil and gas exploration and ENSEMBLE EMPIRICAL MODE DECOMPOSITION: A NOISE-ASSISTED Positive Displacement Pumps an overview | ScienceDirect The Equity Engineering Group, Inc.
Journal ArticleDOI
Unsteady Pressure Analysis of a Swirling Flow With Vortex Rope and Axial Water Injection in a Discharge Cone
TL;DR: In this paper, a special test rig was developed at “Politehnica” University of Timi-soara in order to investigate different flow control techniques for a Francis turbine cone at 70% partial discharge.
Journal ArticleDOI
An Outlook on the Draft-Tube-Surge Study
Michihiro Nishi,Shuhong Liu +1 more
TL;DR: A review of previous attempts for the last three decades to challenge the following topics: a rational method for component test of a draft tube, nature of spiral vortex rope and its behavior in a tube and cavitation characteristics of pressure fluctuations, are introduced together with other related contributions, expecting that more useful and significant studies will be accomplished in the future as discussed by the authors.
Journal ArticleDOI
Flow-Feedback Method for Mitigating the Vortex Rope in Decelerated Swirling Flows
TL;DR: In this article, the authors demonstrate that the control jet injected at the inlet of the conical diffuser can actually be supplied with water collected from the discharge cone outlet, thus introducing a new concept of flow feedback.
Journal ArticleDOI
Unsteady Simulations of the Flow in a Swirl Generator, Using OpenFOAM
TL;DR: In this article, the authors presented numerical results of the flow in the swirl flow generator test rig developed at Politehnica University of Timisoara, Romania using OpenFOAM.
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Experimental study of swirling flow from conical diffusers using the water jet control method
Alin Bosioc,Constantin Tanasa +1 more