Eksperimentalno modeliranje superkavitacije na različnih geometrijah Venturijeve zožitve

Herman, Ula (author), Petkovšek, Martin (mentor)

V sklopu zaključne naloge smo opravili eksperimentalne meritve za potrebe razvoja merilnega testnega dela, kjer bo formiran superkavitacijski oblak. Različne geometrije smo zasnovali v modelirniku (SolidWorks), jih dali izdelati iz akrilnega stekla in zasnovali eksperimentalno progo, na kateri smo izvajali meritve, rezultate pa smo nato analizirali. Merilna proga je omogočala hitro in enostavno menjavo različnih geometrij testnih delov. Kavitacijski oblak formiran znotraj testnega dela je bil okarakteriziran s pomočjo tlačnih razmer pred in za testnim delom, meritvami pretoka tekočine skozi testni del in vizualizacijo s pomočjo hitre kamere. Cilj naloge je bil okarakterizirati različne geometrije Venturijevih zožitev za formacijo superkavitacijskega oblaka. Želeli smo razviti superkavitacijski oblak, ki bi zavzemal čim večji volumen pretočnega kanala znotraj zožitve.

• Language: Slovenian
• Keywords: kavitacija, superkavitacija, Venturijeva zožitev, kavitacijsko število, pretok, absolutni tlak
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [U. Herman]
• Year: 2020
• Number of pages: XIII, 23 f.
• PID: 20.500.12556/RUL-119960
• UDC: 532.528:532.57:004.925.8(043.2)
• COBISS.SI-ID: 32264963
• Publication date in RUL: 14.09.2020

Secondary language

• Language: English
• Title: Experimental modelling of supercavitation on various venturi restriction geometries

Abstract

As part of the final task, we performed experimental measurements for the needs of the development of the measurement test part, where a supercavitation cloud will be formed. Different geometries were designed in the model (SolidWorks) from acrylic glass. We designed an experimental track on which we performed measurements, then analyzed the results. The measuring track made it possible to quickly and easily change the different geometries of the test parts. The cavitation cloud formed in the test section was characterized by pressure conditions before and after the test section, measurements of fluid flow through the test section, and visualization using a high-speed camera. The purpose of the task was to describe the different geometries of the Venturi constrictions for the formation of a supercavitation cloud. We wanted to develop a supercavitation cloud that would occupy as much of the flow channel volume as possible within the constriction.

• Keywords: cavitation, supercavitation, cavitation number, flow, Venturi narrowing, absolute pressure