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Experimental analysis of the freestream length scale and turbulence intensity impact on bypass transition in boundary layer on a ﬂat plate

Grzelak J., Wierciński Z.

Transactions of the Institute of Fluid-Flow Machinery

2018

nr 139

23--44

An experimental investigation of the turbulent ﬂow over a ﬂat plate in a subsonic wind tunnel was carried out. The enhanced level of turbulence was generated by ﬁve wicker grids with square meshes, and diﬀerent parameters (diameter of the grid rod 0.3–3 mm and the grid mesh size 1–30 mm). The velocity of the ﬂow was measured by means of a 1D hot-wire probe, suitable for measurements in a boundary layer. The aim of the investigation was to explore the turbulence length scale in the ﬂow behind grids and to study its inﬂuence on the onset of laminar-turbulent bypass transition in a boundary layer on a ﬂat plate. To assess the isotropy of turbulence, the skewness and kurtosis factors of the ﬂow velocity distribution were determined. Several longitudinal scales of turbulence were determined and compared (integral, dissipation, Taylor microscale, and Kolmogorov scale) for diﬀerent grids and diﬀerent velocities of the mean ﬂow 4, 6, 10, 15, and 20 m/s.