پديد آورنده :
مجدمي، محمدجواد
عنوان :
بررسي تاثير ورودي گلبرگي شكل بر هيدروليك جريان آزاد درسرريزهاي مدور قائم
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده عمران
صفحه شمار :
دوازده،84ص.: مصور،جدول،نمودار(رنگي)
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
عبدالرضا كبيري ساماني
توصيفگر ها :
ضريب دبي , آستانه ي استغراق روزنه اي , سرريز گلبرگي و مدل آزمايشگاهي
تاريخ نمايه سازي :
17/1/93
استاد داور :
مجتبي صانعي، محمد نويد مقيم
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Effects of Daisy Marguerite Shape Inlet on Free Flow over Shaft Spillways Mohammad Javad Mojadami Mj mojadami@cv iut ac ir January 19 2014 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Abdorreza Kabiri Samani Email address akabiri@cc iut ac irAbstractSpillways and bottom outlets are the common hydraulic structures in dam engineering to conveyexcess water from the reservoir toward the downstream river Economy and operation are the majorfactors affecting the type of spillway and its crest shape to avoid unfavorable hydraulic phenomena An appropriate spillway crest results in increasing the discharge coefficient and distributing a uniformpressure inside the conveying conduits One of the most common types of spillways in damengineering is shaft spillways with morning glory inlet Generation of swirling flow at the entrance ofthe shaft spillways and entraining air into the conduits is an unfavorable phenomenon Air entrainment into the system leads to different depressing effects on system operation includingreduction of the discharge coefficient and can cause severe damages To control the swirling flowphenomenon one way is the application of anti vortex devices Applying certain shape of inlets e g installing a Daisy Marguerite shape inlet over the shaft entrance is another alternation to avoid theswirling flow effects thereby to increase the discharge coefficient Marguerite shape inlet has beenused in different existing dam projects Marguerite inlet is a unique inlet compared to other shapes ofspillway crests for a constant head This is in part due to spatially varied flow inside the margueriteinlet which makes it capable of passing greater discharge Although different types of dam spillwayshave been the subject of different investigations there is a lack of study on these types of spillways In this study the effects of Daisy Marguerite shape inlet on free flow through shaft spillways havebeen investigated based on model experimentation Dimensional analysis has been used to determinethe effective dimensionless parameters Experiments were conducted in a cylindrical model of 2 mdiameter with two shafts of 10 and 12 5 cm diameters on the tank bottom The tests have beenperformed based on a wide range of geometric and hydraulic parameters to study the effects of eachdimensionless parameter on flow hydraulics Finally applying SPSS software and nonlinearregression analyses empirical correlations were obtained for estimating the discharge coefficient andthe threshold depth of orifice flow over Daisy shape inlets To validate these correlations thenormalized root mean square error NRMSE the weighted quadratic deviation WQD and thecoefficient of determination R2 were applied Contrary to R2 both NRMSE and WQD must be smallto have the best correlations Keywords Daisy Marguerite inlet Discharge coefficient Experimental model Free flow Orificeflow Shaft spillways Threshold depth
استاد راهنما :
عبدالرضا كبيري ساماني
استاد داور :
مجتبي صانعي، محمد نويد مقيم
