An Investigation of Turbulence in Open Channel Flow via Three-component Laser Doppler Anemometry

by Mahalingam Balakrishnan, Virginia Polytechnic Inst, Blacksburg, United States,
Clinton L. Dancey, Virginia Polytechnic Inst, Blacksburg, United States,

Document Type: Proceeding Paper

Part of: Fundamentals and Advancements in Hydraulic Measurements and Experimentation


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: Open channel flow | Turbulent flow | Flow measurement | Lasers | Doppler systems | Water flow | Statistics

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