izpis_h1_title_alt

Visualization and measurements of shock waves in cavitating flow
ID Petkovšek, Martin (Author), ID Hočevar, Marko (Author), ID Dular, Matevž (Author)

.pdfPDF - Presentation file, Download (11,44 MB)
MD5: 14DD6282D3B862A77615F6C7E0FE3F11
URLURL - Source URL, Visit https://www.sciencedirect.com/science/article/pii/S0894177720307196 This link opens in a new window

Abstract
Upon cavitation cloud collapse an omnidirectional shock wave is emitted. It then travels through the flow field, causing a cascade of events resulting in erosion, noise, vibration and the cavitation shedding process. Despite that the accumulated data points evidently to the presence of the shock waves, the direct measurements hardly exist - and even then, they are very expensive and time consuming to perform. In the present paper, the possibility of detecting shock waves inside cavitating flow is shown. The methodology bases on using two conventional high speed cameras. With the first one cavitating flow from a distance is observed, determining the position of the wave, while the second camera with a microscopic lens enables a close-up view to determine the number and size change of air bubbles as a shock wave passed them. By calibration and reference measurements the amplitude of the shock waves was determined. This relatively simple approach enabled the first observation of shockwaves which occur at the cavitation cloud collapse (downstream of the attached cavity). Several examples of shock wave dynamics are shown and how they influence the general cavitation cloud behaviour. Shock wave front velocities and local pressure waves caused by cloud collapse were estimated from visualization, reaching values to more than 700 m/s and over 5 MPa respectively.

Language:English
Keywords:cavitation, shock waves, high speed video, cloud collapse
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2020
Number of pages:10 str.
Numbering:Vol. 119, art. 110215
PID:20.500.12556/RUL-117685 This link opens in a new window
UDC:532.528(045)
ISSN on article:0894-1777
DOI:10.1016/j.expthermflusci.2020.110215 This link opens in a new window
COBISS.SI-ID:23172099 This link opens in a new window
Publication date in RUL:21.07.2020
Views:889
Downloads:489
Metadata:XML RDF-CHPDL DC-XML DC-RDF
:
Copy citation
Share:Bookmark and Share

Record is a part of a journal

Title:Experimental thermal and fluid science
Shortened title:Exp. therm. fluid sci.
Publisher:Elsevier
ISSN:0894-1777
COBISS.SI-ID:170523 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Keywords:kavitacija, udarni valovi, visokofrekvenčno snemanje, kolaps kavitacijskega oblaka

Projects

Funder:ARRS - Slovenian Research Agency
Project number:P2-0401
Name:Energetsko strojništvo

Funder:ARRS - Slovenian Research Agency
Project number:J7-1814
Name:Kavitacija - rešitev za problematiko mikroplastike?

Funder:EC - European Commission
Funding programme:H2020
Project number:771567
Name:An investigation of the mechanisms at the interaction between cavitation bubbles and contaminants
Acronym:CABUM

Similar documents

Similar works from RUL:
Similar works from other Slovenian collections:

Back