An Investigation of Turbulence in Open Channel Flow via Three-component Laser Doppler Anemometryby Mahalingam Balakrishnan, Virginia Polytechnic Inst, Blacksburg, United States,
Clinton L. Dancey, Virginia Polytechnic Inst, Blacksburg, United States,
Abstract: A three-component laser Doppler anemometer is used to reexamine the distribution of single-point mean statistics in a nearly uniform fully-developed 2D turbulent open channel flow of water at a channel Re of 16100 and Fr = 0.17. Measurements of mean velocity, Reynolds stress, turbulent component intensities, 2D probability density functions and conditioned quadrant statistics are reported. Multi-element hot film measurements reported in the literature are used for limited comparisons. The viability of 3D LDA for nonintrusive, high spatial resolution measurements in open-channel flow is demonstrated.
Subject Headings: Turbulent flow | Open channel flow | Flow measurement | Doppler systems | Two-dimensional flow | Three-dimensional flow | Lasers | Statistics
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