Efficient of input to output key width and key gradient on flow rate coefficient on three-cycle piano key weirs
Author(s):
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
Today, using piano key weirs is a proper solution to increase the discharge capacity compared to existing weirs. The appropriate design of these weirs requires sufficient precision to predict the discharge capacity. In the current study, a new type of piano key weirs with a triangular nose has been used and to determine the effects of geometric parameters of the inlet to outlet key width ratio on the flow coefficient, various experiments have been carried on three-cycle weirs with a triangular nose under hydraulic conditions. The results of the study indicated that with the increase of hydraulic charge, the flow coefficient increases firstly and then decreases. The flow coefficient also shows an increase in Piano Key weir when the ratio of input key to output key increases from 0.8 to 1.25 and from 19.2 to 25.2%.A mathematical equation has been obtained using the results of the experiment to determine the discharge coefficient of three-cycle piano key weirs. This equation has less errors than other equations found in the previous findings. Furthermore, throughout the whole process of adhesion-aeration, piano key weirs reached the highest discharge coefficient (0.1 ≥Hd/P≤ 0.2) and two-cycle weirs gave a significantly higher discharge coefficient than three-cycle weirs. The results of this study revealed that the proportion of Wi/Wo=1.25 and the slope of 25.2 percent had the highest discharge coefficient (0.592).
Keywords:
Language:
Persian
Published:
Iranian Journal of Irrigation & Drainage, Volume:14 Issue: 3, 2020
Pages:
867 to 880
https://www.magiran.com/p2163039
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