Energy Losses And Turbulence Characteristics Through Hydraulic Structures Using Laser Doppler Velocimetry(LDV)
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2013, Vol 3, Issue 6
Abstract
This paper deals with the experimental investigation of energy losses and turbulence characteristics through hydraulic structures in a rectangular channel using Laser Doppler, measurements include turbulence intensity components and mean velocity components. Experiments were conducted with different contraction ratios at different expansion angles for different bed slopes. The results show that, the rate of variation of the energy loss increases till expansion angle about 30°. This rate of increase decreases above this value of angle of expansion. The energy loss is quite high at a contraction ratio of 0.7. Also, the results clearly show that, gradual expansion decrease the turbulence intensities in the wall and free surface regions compared to the sudden expansion. The maximum values of the turbulence intensities occur either close to the bed or at the free surface, with minimum values occurring within the core region. The turbulence intensities, however increases sharply at the free surface due to the free surface waves effect, and is the largest in sudden expansion.
Authors and Affiliations
M. I. Attia
Keywords
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