壁面せん断応力測定装置の試作と検討*

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  • ヘキメン センダン オウリョク ソクテイ ソウチ ノ シサク ト ケントウ
  • A Discussion on the Wall Shear Stress Measuring Instrument of Our Own Making

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A floating-element skin friction meter was made by ourselves to measure the shear stress acting on the wall of a wind tunnel. The instrument consists of a small element, three leaf springs, a balance ring, three adjustment screws and a detecting probe. A piece of the small element cut off from the wan is carefully hung on the balance ring by leaf spring at the same level as the wall surface. The piece moves freely streamwise due to a frictional force of fluid and thus the shear stress is directly measured with a displacement gauge as an electrode gap of the probe. This instrument is set in the turbulent boundary layer within the wind tunnel to check its performance. The results are compared with the values obtained by Preston tube and Clauser chart in a two dimensional turbulent boundary layer.

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