Abstract
The results of turbulence measurements made in a 48-in. (1.22-m) diarn water tunnel with and without an upstream honeycomb are reported. Comparison is made to previous measurements made behind a similar honeycomb. Axial turbulence intensity measurements agreed well with previously predicted levels in the test section, as well as this author's predicted levels based on plenum section measurements. In addition, the longitudinal integral length scale was estimated in the test section. Spectral analysis showed an abnormally high turbulent energy level at low flow speeds; higher flow velocities had energy spectra with consistently lower levels and similar shapes. Recommendations are given for the tunnel operating conditions that produce minimum turbulence levels.
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