我国滨海核电厂(nuclear power plants,NNPs)取水安全形势严峻,取水产生的卷吸效应在一定程度上会对海洋生物造成损伤,已逐渐引起重视。调研了我国典型核电厂已发生的取水堵塞事件、取水卷吸影响等,结合取水工程海域流场特征、海洋生物...我国滨海核电厂(nuclear power plants,NNPs)取水安全形势严峻,取水产生的卷吸效应在一定程度上会对海洋生物造成损伤,已逐渐引起重视。调研了我国典型核电厂已发生的取水堵塞事件、取水卷吸影响等,结合取水工程海域流场特征、海洋生物卷吸数据等分析了取水对海洋生物的潜在影响并提出了可能的应对措施,为减缓取水卷吸及保障取水安全提供依据。展开更多
In the long distance transportation of slurry filled for mining filling,there exist complex variation rules of pressure and flow velocity,pipe distribution location and other influencing factors.Electrical capacitance...In the long distance transportation of slurry filled for mining filling,there exist complex variation rules of pressure and flow velocity,pipe distribution location and other influencing factors.Electrical capacitance tomography(ECT)is a technique for visualizing two-phase flow in a pipe or closed container.In this paper,a visual detection method was proposed by image reconstruction of core,laminar,bubble and annular flow based on ECT technology,which reflects distribution of slurry in deep filling pipeline and measures the degree of blockage.There is an error between the measured and the real two-phase flow distribution due to two factors,which are immature image reconstruction algorithm of ECT and difference of flow patterns leading to degrees of error.In this paper,convolutional neural networks(CNN)is used to recognize flow patterns,and then the optimal image is calculated by the improved particle swarm optimization(PSO)algorithm with weights using simulated annealing strategy,and the fitness function is improved based on the results of the shallow neural network.Finally,the reconstructed binary image is further processed to obtain the position,size and direction of the blocked pipe.The realization of this method provides technical support for pipeline detection technology.展开更多
文摘我国滨海核电厂(nuclear power plants,NNPs)取水安全形势严峻,取水产生的卷吸效应在一定程度上会对海洋生物造成损伤,已逐渐引起重视。调研了我国典型核电厂已发生的取水堵塞事件、取水卷吸影响等,结合取水工程海域流场特征、海洋生物卷吸数据等分析了取水对海洋生物的潜在影响并提出了可能的应对措施,为减缓取水卷吸及保障取水安全提供依据。
基金Project(51704229)supported by the National Natural Science Foundation of ChinaProject(2018YQ2-01)supported by the Outstanding Youth Science Fund of Xi’an University of Science and Technology,China。
文摘In the long distance transportation of slurry filled for mining filling,there exist complex variation rules of pressure and flow velocity,pipe distribution location and other influencing factors.Electrical capacitance tomography(ECT)is a technique for visualizing two-phase flow in a pipe or closed container.In this paper,a visual detection method was proposed by image reconstruction of core,laminar,bubble and annular flow based on ECT technology,which reflects distribution of slurry in deep filling pipeline and measures the degree of blockage.There is an error between the measured and the real two-phase flow distribution due to two factors,which are immature image reconstruction algorithm of ECT and difference of flow patterns leading to degrees of error.In this paper,convolutional neural networks(CNN)is used to recognize flow patterns,and then the optimal image is calculated by the improved particle swarm optimization(PSO)algorithm with weights using simulated annealing strategy,and the fitness function is improved based on the results of the shallow neural network.Finally,the reconstructed binary image is further processed to obtain the position,size and direction of the blocked pipe.The realization of this method provides technical support for pipeline detection technology.
