بررسي آزمايشگاهي پارامترهاي هيدروليكي آبگيرهاي با كف مشبك

Experimental Investigations on Hydraulic Parameters of Bottom Rack Intakes

In the present paper, hydraulic parameters of bottom rack structures are investigated experimentally in clear water. A double storey channel was designed to measure the remained and diverted discharges Q, and Qa, respectively, when the flow passed over a bottom rack. The effects of various parameters on the discharge coefficient C() such as intake length L, ratio of clear open spaces to the total intake surface c, and bar diameter (/) were explored by performing several sets of experiments with different discharges. Additionally, statistical investigations on experimental discharge coefficients led to a non-linear relationship among bar arrangements, ratio of bar diameter to the clear space between bars, and bottom rackʹs Reynolds number. Finally, a simple guideline is suggested for a successful rack design.