EFFECT OF INCLINED HUMP ON THE TURBULENCE INTENSITIES AND FLOW CHARACTERISTICS IN THE SEPARATED FLOW THROUGH WATER STRUCTURES

Mahmoud.I.A.Elshewey

Abstract: In this paper, an experimental study was carried out to investigate the turbulence field and flow characteristics in the separated flow through inclined hump in water structures in rectangular channel using Laser. To study the variation of the turbulence, energy loss, relative energy (efficiency) and relative depth with main parameters affecting the inclined hump These parameters include the hump angle, relative height, upstream Froude number, bottom slope. Non-dimensional design curves are provided to relate the turbulence intensities and flow characteristics. The results show that, the variation of the energy loss increases till of hump angle about 45°. This rate of increase decreases about this value of angle of hump. The energy loss increases with the increasing of bed slope and relative height. The energy loss is quite high at a relative contraction of 0.3. Also, the results clearly showed the dependence of the hump inclination angle on the turbulence intensities. For hump angle = 20°, the turbulence intensity in the separation zones was growing with increasing hump angles and the maximum was observed for hump inclination angles between 20° and 30°. The results indicated that, the most significant differences in flow structures occurred with hump angle less than 45°.

Keywords: Energy loss-Turbulence intensities-Water structures- Hump-Laser Technique-Hump angle-Bottom slopeRelative height-Relative depth- Froude number-separation zones.

DOI: https://doi.org/10.15623/ijret.2013.0211020