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Design of Contraction, Test Section, and Diffuser for a High-Speed Water Tunnel

Ivaylo Nedyalkov
Göteborg : Chalmers tekniska högskola, 2012. Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, ISSN 1652-8557; 2012:40, 2012.
[Examensarbete på avancerad nivå]

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.

Nyckelord: Water tunnel, Contraction, Test section, Diffuser, PTV, LDV, PIV, Pressure measurements

Publikationen registrerades 2013-03-20. Den ändrades senast 2019-05-20

CPL ID: 174857

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