HYDRAULIC PERFORMANCE OF SYPHONS UNDER CONTROLLING BY INLET AND OUTLET PIPE CUTTING ANGLES

Mohamed A. Awad, Gamal M. Abd-elaal, Mohamed N. Salem, Magdy H. Mowafy

Abstract


This study aims to improve the hydraulic performance of pipe siphon. An inlet and different outlet cutting angles were used to control the flow through the pipe and to minimize losses resulting from the sudden contraction of the syphon. Experimental works were carried out using rectangular circulating flume and pipe syphon model. The pipe inlet has a constant cutting angle of (1= 15) anticlockwise from the vertical axis of. The pipe outlet model had different cutting angles of (2= 0, 15, 30, 45, and 60) clockwise from the vertical axis of the pipe outlet. The pipe syphon were tested using different discharges (Q = 7.28 to 57.20 lit. /sec) and different downstream submergence ratios (Hd /D = 0.0, 0.25, 0.50, 0.75, and 1.0). Dimensional analysis was employed to get the inter-relationships among the different factors affecting the head losses through the syphon. The results of the study led to (1=60) with submerged ratios of (Hd/D = 0.0 and 0.25) gives best results for losses and upstream water depth, while The outlet cutting angle of (1=30) with a downstream submerged ratios of (Hd/D = 0.50, 0.75, and 1.00) gives best results for losses and upstream water depth

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