کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
771948 1462883 2014 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Shape optimization of draft tubes for Agnew microhydro turbines
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی (عمومی)
پیش نمایش صفحه اول مقاله
Shape optimization of draft tubes for Agnew microhydro turbines
چکیده انگلیسی


• The draft tube of Agnew microhydro turbine was optimized.
• Pareto optimal solutions were determined by neural networks and NSGA-II algorithm.
• The pressure recovery factor increases with height and angle over design ranges.
• The loss coefficient reaches the minimum values at angles about 2o.
• Swirl of the incoming flow has great influence on the optimization results.

In this study, the shape optimization of draft tubes utilized in Agnew type microhydro turbines has been discussed. The design parameters of the draft tube such as the cone angle and the height above the tailrace are considered in defining an optimization problem whose goal is to maximize the pressure recovery factor and minimize the energy loss coefficient of flow. The design space is determined by considering the experimental constraints and parameterized by the method of face-centered uniform ascertain distribution. The numerical simulations are performed using the boundary conditions found from laboratory tests and the obtained results are analyzed to create and validate a feed-forward neural network model, which is implemented as a surrogate model. The optimal Pareto solutions are finally determined using the NSGA-II evolutionary algorithm and compared for different inlet conditions. The results predict that the high swirl of the incoming flow drastically reduces the performance of the draft tube.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Energy Conversion and Management - Volume 79, March 2014, Pages 681–689
نویسندگان
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