The use of a contraction to improve the isotropy of grid-generated turbulence

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<jats:p>It is found that when the average kinetic energies of normal velocity components in decaying, grid-generated turbulence are equilibrated by a symmetric contraction of the wind tunnel, this equality can persist downstream. A second result is further confirmation of the fact that the best power-law fit to the inverse turbulent energy during the early part of decay is near (<jats:italic>x–x</jats:italic><jats:sub>1</jats:sub>)<jats:sup>1·25</jats:sup>, for both rod grids and disk grids. The Kolmogorov decay law <jats:inline-formula id="ffm1">$\sim (t - t_1)^{\frac{10}{7}}$</jats:inline-formula> is re-derived by a spectral method which is essentially equivalent to the original. Finally, a crude theoretical estimate of component energies in the straight duct after a weak contraction seems to support the experiments.</jats:p>

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