پديد آورندگان :
محمدرضاپورطبري، محمود دانشگاه شهر كرد - دانشكده فني مهندسي - گروه مهندسي عمران , توكلي، شيوا دانشگاه شهر كرد - دانشكده فني مهندسي - گروه مهندسي عمران , شالچي تبريزي، امير دانشگاه صنعتي شريف - دانشكده مهندسي هوا فضا - گروه مهندسي هوا فضا
چكيده فارسي :
سرريزهاي استوانه اي از جمله سرريزهاي لبه پهن هستند كه نسبت به موارد جايگزين داراي مزايايي از جمله اقتصادي، طراحي آسان و ضريب دبي بالا است. انحناي زياد خطوط جريان روي اين نوع سرريزها از عوامل موثر بر ضريب دبي است. بررسي ضريب دبي جريان در سرريزهاي استوانه اي به دليل تغييرات شرايط هيدروليكي آنها در طراحي و كاربرد اين سازه ها مهم است در اين پژوهش جريان روي سه گروه سرريز استوانه اي با قطرهاي 6/3، 9، 11/4 سانتي متر با استفاده از مدل عددي FLOW-3D مورد بررسي شده است. در اين بررسي براي حل معادلات حاكم از روش حجم محدود و براي ارزيابي آشفتگي جريان از مدل RNG استفاده شده است . نتايج اين پژوهش به صورت پروفيل هاي سرعت ارائه شده و ضريب دبي جريان براي دبي هاي متفاوت محاسبه شد. نتايج به دست آمده از اين مدل عددي با نتايج آزمايشگاهي همين گروه سرريزهاي استوانه اي مقايسه و مشخص شد كه همخواني خوبي دارد.
چكيده لاتين :
The circular weirs are one kind of broad crested weirs that have some advantages such as being economic, simple designing and high discharge coefficient in comparison with the other alternatives. High curvature of the stream lines over this kind of weirs is one of affecting factors on the discharge coefficient. The study of discharge coefficient in the circular weirs, due to changes of hydraulic conditions, is very important in the design and application of these structures. In this research, the flow has been studied over 3 groups of circular weirs with diameters 6.3, 9.0 & 11.4 cm, using the numerical model of FLOW-3D. Further, the method of finite volume was used to solve the extant equations and the model of RNG was also used to investigate the flow turbulence. The results have been presented as velocity profiles and discharge coefficient which was calculated for different discharge rates. The results of this numerical model were compared with experimental results for these groups of circular weirs, and a proper agreement has been observed between them.
The circular weirs are one kind of broad crested weirs that have some advantages such as being economic, simple designing and high discharge coefficient in comparison with the other alternatives. High curvature of the stream lines over this kind of weirs is one of affecting factors on the discharge coefficient. The study of discharge coefficient in the circular weirs, due to changes of hydraulic conditions, is very important in the design and application of these structures. In this research, the flow has been studied over 3 groups of circular weirs with diameters 6.3, 9.0 & 11.4 cm, using the numerical model of FLOW-3D. Further, the method of finite volume was used to solve the extant equations and the model of RNG was also used to investigate the flow turbulence. The results have been presented as velocity profiles and discharge coefficient which was calculated for different discharge rates. The results of this numerical model were compared with experimental results for these groups of circular weirs, and a proper agreement has been observed between them.
The circular weirs are one kind of broad crested weirs that have some advantages such as being economic, simple designing and high discharge coefficient in comparison with the other alternatives. High curvature of the stream lines over this kind of weirs is one of affecting factors on the discharge coefficient. The study of discharge coefficient in the circular weirs, due to changes of hydraulic conditions, is very important in the design and application of these structures. In this research, the flow has been studied over 3 groups of circular weirs with diameters 6.3, 9.0 & 11.4 cm, using the numerical model of FLOW-3D. Further, the method of finite volume was used to solve the extant equations and the model of RNG was also used to investigate the flow turbulence. The results have been presented as velocity profiles and discharge coefficient which was calculated for different discharge rates. The results of this numerical model were compared with experimental results for these groups of circular weirs, and a proper agreement has been observed between them.
The circular weirs are one kind of broad crested weirs that have some advantages such as being economic, simple designing and high discharge coefficient in comparison with the other alternatives. High curvature of the stream lines over this kind of weirs is one of affecting factors on the discharge coefficient. The study of discharge coefficient in the circular weirs, due to changes of hydraulic conditions, is very important in the design and application of these structures. In this research, the flow has been studied over 3 groups of circular weirs with diameters 6.3, 9.0 & 11.4 cm, using the numerical model of FLOW-3D. Further, the method of finite volume was used to solve the extant equations and the model of RNG was also used to investigate the flow turbulence. The results have been presented as velocity profiles and discharge coefficient which was calculated for different discharge rates. The results of this numerical model were compared with experimental results for these groups of circular weirs, and a proper agreement has been observed between them.
The circular weirs are one kind of broad crested weirs that have some advantages such as being economic, simple designing and high discharge coefficient in comparison with the other alternatives. High curvature of the stream lines over this kind of weirs is one of affecting factors on the discharge coefficient. The study of discharge coefficient in the circular weirs, due to changes of hydraulic conditions, is very important in the design and application of these structures. In this research, the flow has been studied over 3 groups of circular weirs with diameters 6.3, 9.0 & 11.4 cm, using the numerical model of FLOW-3D. Further, the method of finite volume was used to solve the extant equations and the model of RNG was also used to investigate the flow turbulence. The results have been presented as velocity profiles and discharge coefficient which was calculated for different discharge rates. The results of this numerical model were compared with experimental results for these groups of circular weirs, and a proper agreement has been observed between them.
