Hydraulic Characteristics of Semi- Circular Sharp Crested Weirs
الشريط الجانبي للمقالة
محتوى المقالة الرئيسي
الملخص
In this research the hydraulic characteristics of sharp crested weirs with semi- circular shape were studied, the study was depended on the dimensional analysis which confirmed by experimental work. The dimensional analysis results demonstrate that the effective parameters on the discharge of flow over this type of weir are the ratio of water height above the weir crest to the radius of this weir (H/R) and the ratio of water height above the weir crest to the height of the crest (H/P). Experimental tests were carried out on (16) models of weirs with Semi-circle shape where the radius of cutting was change four times (R=5, 10, 15, 20 cm) and for any radius the height of the crest was change four times (P= 30, 25, 20, 15 cm). The results show a great influence of the parameter (H/R) on flow parameter (Q2/gH5) while the effect of the parameter (H/P) is limited. Depending on non-dimensional parameters and experimental results, the statistics program (SPSS) were used to create empirical equation for measuring the discharge over the sharp crested weirs with semi-circular shape. The results of the equation show a very good agreement with the experimental result for determine the discharge with knowing the depth of water over the weir (H) , radius of cutting of the weir (R) and height of the crest (P). Also the equation shows a great influence of the radius (R) and limited influence of the height (P) on the discharge over this type of weirs.
المقاييس
تفاصيل المقالة
هذا العمل مرخص بموجب Creative Commons Attribution 4.0 International License.
THIS IS AN OPEN ACCESS ARTICLE UNDER THE CC BY LICENSE http://creativecommons.org/licenses/by/4.0/
##plugins.generic.plaudit.displayName##
المراجع
- Al-Tikrity R. A., “Discharge Coefficient for Semi – Circular Crested Rectangular Weirs”, M. SC. Thesis, Civil Eng. Dept., Tiikrit University, (2000).
- Leliavsky, S., “Irrigation Engineering Siphons Weirs and Locks”, Vol. II , Chapman and Hall, London , 1957 .
- Jorge D . A, Bruce L.R., “Flow Structure at Different Stages in Amender –Bend with Ben way Weirs” Journal of Hydraulic Engineering, ASCE, August ,2008.
- Ackers , P. Whit , W.R., Perkins, J .A .& Harrison A . J . N . , “Weirs and Flumes for Measurement”, John Wiley and Sons , London , 1978 .
- Allen G. S. and Daltan S. H., “Weirs for Open Channel Flow Measurement”, Journal of Hydraulic Engineering , ASCE , August 2008 .
- Kandaswawy , P . K . and Rouse , H, “Characteristics of Flow Over Terminal Weirs and Sills” , Proc. ASCE Journal of the Hydraulics Division, Vol. 83, Hyd4 , Aug . , 1957 DOI: https://doi.org/10.1061/JYCEAJ.0000101
- Modi , P . N , “Flow Over Notches and Weirs Hydraulics and Fluid Mechanics”, Standard Book House, Nai Savak Delhi , 1973 .
- Maupicel . Albertonson , Jtmes . R .B and Daryl, B. S., “Fluid Mechanics for Engineering”, Englewood Cliffs N. J., Prentice – Hall, 1 nc, USA, 1960.
مؤيد سعدالله خليل , محمد رمضان خلف "تجارب -
في الهيدروليك "، وزارة التعليي العيالي والثحي
العلمي، جامعة الموصل 1978 .
- P. Novak, A. Moffat, C. Nalluri and R. Narayanane, “Hydraulic Structures”, Third Edition Dept. of Civil Engineering, University of Manchester Institute of Since and Technology , U . K ,2001 .
- Rao, S. S., and Shulka M. K. , “Characteristics of Circular Crested Weirs”, Proc. ASCE , No. Hyd. 11, Nov , 1971 .
- Vennard J . U . and street , R .L., “Elementary of Fluid Mechanics”, John Wiley & sons. , Singapore, 1997.
- Kindsvater, C. E. and Carter, R . W., “Discharge Characteristic Rectangular Thin Plate Weirs”, Proc . ASCE, Journal of Hydraulic Division, Vol. 83, No. Hyd 6 , Dec ., 1959 . DOI: https://doi.org/10.1061/JYCEAJ.0000142