Design of Contraction, Test Section, and Diffuser for a High-Speed Water Tunnel
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Typ
Examensarbete för masterexamen
Master Thesis
Master Thesis
Program
Publicerad
2012
Författare
Nedyalkov, Ivaylo
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Contraction, test section and diffuser for a high-speed water tunnel were designed. Theoretical and numerical studies were used to determine the components shapes and sizes, by investigating ow uniformity, ow speed and cavitation numbers, boundary layer growth and blockage ratio. The design, which was limited by the rest of the water tunnel circuit, consisted of a 5th-order- polynomial-shaped contraction with contraction ratio of 7 and L/D ratio of 1.5; 600 600 3600 square test section, and a square-to-round transition/diffuser with a constant increase of cross-sectional area in downstream direction. The components were designed, manufactured and installed. Further upgrades and modifications to the water tunnel were made, including installing a new motor and drive, new supports, and a shortened straight duct, which simplified installation. Additionally, a pressure/vacuum system was designed and installed to control test section pressure independently. PTV, LDV, PIV and pressure measurements were performed for motor speeds between 10% and 76% of the maximum motor speed. The ow speed in the test section varied linearly as a function of the motor rpm, as anticipated, and its magnitude was larger than the originally expected. The growth of the boundary layer and resultant increase in center-line velocity were observed. Suggestions were made for improving similar future work.
Beskrivning
Ämne/nyckelord
Strömningsmekanik och akustik , Grundläggande vetenskaper , Hållbar utveckling , Energi , Transport , Fluid Mechanics and Acoustics , Basic Sciences , Sustainable Development , Energy , Transport