In this study, a series of ecological porous spur-dikes are arranged in an experiment channel to simulate a real field drainage ditch. The inside and outside flow fields of spur-dikes are determined by numerical simul...In this study, a series of ecological porous spur-dikes are arranged in an experiment channel to simulate a real field drainage ditch. The inside and outside flow fields of spur-dikes are determined by numerical simulations and experimental methods. An Ammonia-Nitrogen（NH3-N） degradation evaluation model is built to calculate the pollution removal rate by coupling with the inner flow field of the porous spur-dikes. The variations of the total pollutant removal rate in the channel are discussed in terms of different porosities and gap distances between spur-dikes and inlet flow velocities. It is indicated that a reasonable parameter matching of the porosity and the gap distance with the flow velocity of the ditch can bring about a satisfactory purification efficiency with a small delivery quantity of ecological porous materials.展开更多
不同类型的丁坝对沿河公路路基的防护效果不同.应用大型流场分析软件FLUENT,采用现代三维运动界面追踪技术VOF(volume of fluid)方法和标准k-ε模型耦合求解,对三种不同类型丁坝的绕流流场进行了分析比较,指出漫水丁坝和透水丁坝是较为...不同类型的丁坝对沿河公路路基的防护效果不同.应用大型流场分析软件FLUENT,采用现代三维运动界面追踪技术VOF(volume of fluid)方法和标准k-ε模型耦合求解,对三种不同类型丁坝的绕流流场进行了分析比较,指出漫水丁坝和透水丁坝是较为合理的丁坝形式,从而为丁坝的设计和建造提供了理论分析的基础.展开更多
基金Project supported by the National Science Funds for Creative Research Groups of China(Grant No.51421006)the National Major Projects of Water Pollution Control and Management Technology(No.2017ZX07204003)+2 种基金the National Key Plan for Research and Development of China(Grant 2016YFC0502203)the Key Program of National Natural Science Foundation of China(Grant No.91647206)the Qing Lan Project of Jiangsu Province
文摘In this study, a series of ecological porous spur-dikes are arranged in an experiment channel to simulate a real field drainage ditch. The inside and outside flow fields of spur-dikes are determined by numerical simulations and experimental methods. An Ammonia-Nitrogen（NH3-N） degradation evaluation model is built to calculate the pollution removal rate by coupling with the inner flow field of the porous spur-dikes. The variations of the total pollutant removal rate in the channel are discussed in terms of different porosities and gap distances between spur-dikes and inlet flow velocities. It is indicated that a reasonable parameter matching of the porosity and the gap distance with the flow velocity of the ditch can bring about a satisfactory purification efficiency with a small delivery quantity of ecological porous materials.
文摘不同类型的丁坝对沿河公路路基的防护效果不同.应用大型流场分析软件FLUENT,采用现代三维运动界面追踪技术VOF(volume of fluid)方法和标准k-ε模型耦合求解,对三种不同类型丁坝的绕流流场进行了分析比较,指出漫水丁坝和透水丁坝是较为合理的丁坝形式,从而为丁坝的设计和建造提供了理论分析的基础.
