Abstract
Effects of impulsive change in pressure gradient in a two-dimensional turbulent channel flow have been experimentally investigated. The rapid change of pressure gradient was obtained by passage through a contracted region. Turbulent intensities of velocity fluctuations and Reynolds shear stress following the removal of rapid pressure change were measured by means of a hot-wire anemometer. The statistical properties, i.e., energy spectra, length scales of turbulence, skewness / flatness factors and turbulent diffusions, were investigated. Turbulence intensities and Reynolds shear stress increase due to pressure gradient, however, the correlation coefficient of Reynolds shear stress depends slightly on pressure gradient and is constant across the chennel. The length scales are considerably smaller than those in equilibrium turbulent flows. The turbulent diffusions((U2V)^^- - (UV2)^^-) are negative in the near-wall region. The results reveal that the sweep event of bursting is strengthened by the rapid change in pressure gradient.
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