Special Issue "New Advances of Cavitation Instabilities"
Deadline for manuscript submissions: 31 January 2021.
Interests: Turbomachinery; Instabilities; Experiments; Cavitation
We are inviting submissions to the Special Issue regarding recent scientific advances in cavitation instabilities.
In many applications, cavitating flows are encountered at flow rates with very high Reynolds numbers. This formally unsteady flow type is very sensitive to disturbances. In the ordinary case of a 2D profile, it is rightly recognized that for sufficiently low cavitation numbers, periodic or quasi-periodic cavity shedding arises.
This phenomenon is similar to the classical concept of instability in dynamical systems. On more complex problems, like cavitation in inducers, several periodical behaviors can emerge. Firstly, the local intrinsic flow instabilities will depend on the region that presents hydrodynamic cavitation: tip-leakage vortices, backflow vortices, or blades suction surface. Secondly, interaction between adjacent blades can lead to rotating instability, with cells of various sizes that propagate from blade to blade. Finally, system instabilities are also observed, because of the blockage linked to the volume variation of the pockets, or to a possible positive slope of the inducer characteristics linked to a change in the angle of attack on the blades.
A more proper understanding of these instabilities is of crucial interest, especially in the field of turbomachinery, still motivating applied and fundamental research on cavitation instabilities. Recently, the use of modal analysis tools like POD and DMD on high-speed videos taken on 2D wedges or 2D profiles has shown that several mechanisms with various frequencies can be mixed: the so-called re-entrant-jet and a condensation shock wave. X-ray imaging was successfully used to measure the volume fraction, which highlighted this mechanism for the first time in the last five years. New numerical works with a compressible approach, a use of liquid and vapor state-laws, and LES are under development, and it may be useful to study in more details the physics of these instabilities. Finally, there are, nevertheless, advances to perform concerning the stability analysis of such complex multiphase flows.
This Special Issue, thus, serves to promote exploratory research and development on Hydrodynamic Cavitation Instabilities, both on academic geometries and on industrial cases, with experimental, numerical or analytical tools.
Dr. Florent Ravelet
Manuscript Submission Information
Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.
Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.
Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.
- Hydrodynamic cavitation
- New numerical methods for cavitating flows
- System instabilities
- Cavitation surge
- Rotating cavitation
- Experimental techniques for cavitating flow
- Stability analysis of multiphase flows
- Tip-vortex cavitation
- Surface treatment and cavitation control