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- W2021967512 abstract "This paper describes a new balance, suitable for direct measurement of skin friction in turbulent boundary layers with severe pressure gradients. The gaps between the floating element and the surrounding wall are filled with a liquid in order to eliminate disturbing pressure forces on the element. The resulting friction forces are measured with piezo-electric transducers with high sensitivity and extremely small element displacement. Skin friction measurements were taken in the turbulent boundary layer of a wind tunnel with circular cross-section at M [les ] 0·25. Severe adverse pressure gradients were generated by means of a step on the wall or, alternatively, by a conical centre body. The new apparatus was mainly used to investigate the error of Preston tubes in adverse pressure gradients. It was necessary to develop a new measuring technique to improve the repeatability of the Preston tube readings. The Preston tube error was found to depend on both the local pressure gradient P = ( dp / dx ) ν/ρ 3 τ and on the Preston tube diameter u τ d /ν and to be independent of the upstream pressure distribution for the range of parameters covered by the experiments." @default.
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- W2021967512 date "1980-11-13" @default.
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- W2021967512 title "Direct measurements of skin friction in a turbulent boundary layer with a strong adverse pressure gradient" @default.
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- W2021967512 doi "https://doi.org/10.1017/s0022112080001541" @default.
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