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An Experimental Study on the Effect of Vortex Breakers on Discharge Coefficient for the Shaft Spillways with Sharp Edge and Wide Edge Original Article, D82 Nohani E. J. Civil Eng. Urban. 4(5): 546-549. 2014 ABSTRACT: Shaft spillways are used where there is not adequate space to build other types of spillways to convey flood water from reservoirs downslope dams because shaft spillways are placed on upslope dams and inside dam reservoirs. This spillway has three parts: crest, shaft and tunnel. Shaft can be built vertically. In the earth embankment dams it is better not to build on the body of dam. Here morning glory spillway is very useful. The major problem with these spillways is the strong spiral vortices in the inlet which will reduce the efficiency of tank discharge system. In this paper, the physical model was constructed and the effect of vortex breaker plate on the power of spiral vortex and the efficiency of flow system was studied. Once the data were analysed, the conclusion was that a 20% increase in spillway discharge coefficient was experienced via using blade-vortex breaker and the increase in spillway discharge coefficient with sharp edge was more than a wide-edged. Keywords: Vortex, Shaft Spillway, Vortex Breaker Plate, Hydraulic Model. منبع: [Hidden Content] دانلود: [Hidden Content].,%204%20(5)%20546-549,%202014.pdf J. Civil Eng. Urban., 4 (5) 546-549, 2014.pdf

Experimental Study of Bell-Mouth Intakes on Discharge Coefficient Original Article, C54 Naderi V, Farsadizadeh D, Hosseinzadeh Dalir A, Arvanaghi H. Journal. Civil Eng. Urban. 3(6):368-371. 2013 ABSTRACT:The strong vortices at the mouth of an intake reduce the discharge efficiency. One of the solutions for controlling the vortex is the use of bell-mouth intakes. Since only general guidance for use of bell-mouth intakes is available a study for the more shapes of mouth of intake is needed. Hence, a comprehensive set of experiments have been carried out using 4 different mouth-shapes of a vertical intake. The results showed that with reducing the radius of curvature of bell-mouth intake, the coefficient of discharge rate increased, and maximum discharge coefficient with four different mouth shape of intake with the radius of curvature of 2d was created. Keywords:Discharge coefficient, bell-mouth intake, vortex, radius of curvature of mouth of intake منبع: [Hidden Content] دانلود: [Hidden Content].,54-368-371.pdf J. Civil Eng. Urban.,54-368-371.pdf