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Skin friction and turbulence measurements in a boundary layer with zero-pressure-gradient under the influence of high intensity free-stream turbulence. (English) Zbl 1058.76520
Summary: This experimental investigation deals with the influence of turbulence intensities \(Tu_{\delta}\leqslant 13\%\) and a ratio of integral length scale \(\Lambda_{11}\) to boundary layer thickness \(\lambda_{99.5}\) smaller than two on an axisymmetric turbulent boundary layer with zero pressure gradient. The free-stream turbulence was generated by jets injected normal to the flow upstream of the test section. The boundary layer had a Reynolds number range \(1000 \leqslant Re_{\delta_2}\leqslant 2700\). Skin-friction measurements were performed using oil-film interferometry, Preston tubes and wall hot-wire probes. Mean and fluctuating velocities were measured by hot-wire anemometry, and Reynolds stresses, triple correlations and spectra were evaluated. The free-stream turbulence increases the skin friction by up to 34% and considerably changes both mean and fluctuating velocity distributions in the outer region of the boundary layer.

MSC:
76-05 Experimental work for problems pertaining to fluid mechanics
76F40 Turbulent boundary layers
Keywords:
skin friction
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