针对郑州市高新区城市排水特点,应用暴雨洪水管理模型(stom water management model,SWMM)模型建立城市排水模型,其中下渗模型采用径流曲线数(soil conservation service curve number,SCS-CN)法体现城市下垫面对城市内涝的影响。利用...针对郑州市高新区城市排水特点,应用暴雨洪水管理模型(stom water management model,SWMM)模型建立城市排水模型,其中下渗模型采用径流曲线数(soil conservation service curve number,SCS-CN)法体现城市下垫面对城市内涝的影响。利用该模型对不同重现期实测降雨条件下的超载管段和积水节点进行模拟分析:根据超载时长将超载管段划分为安全超载管段、积水超载管段和内涝超载管段;根据积水时长将积水节点划分为积水点、内涝点和洪涝点;同时根据不同重现期降雨条件下的管网流量与管网最大充满度,将超载管段分为4种情况。研究结果表明:模型能较好地模拟郑州市高新区城市暴雨内涝情况,但高新区雨水管网系统不能很好地应对郑州市排水规范中的设计重现期暴雨;郑州市高新区排水管网超载管段和积水节点产生原因各有不同,但二者具有紧密的正相关关系,超载管段两端的节点更易产生溢流,由此形成4个明显的易涝区。展开更多
SWMM模型(Storm Water Management Model)通常应用于降雨径流和雨水管网的数学模拟。SWMM模型中雨水管网水力学的计算方法和污水管网水力计算方法相似,因此文章将尝试应用SWMM模型针对小区居住处污水管网的水力状态进行模拟计算。为模...SWMM模型(Storm Water Management Model)通常应用于降雨径流和雨水管网的数学模拟。SWMM模型中雨水管网水力学的计算方法和污水管网水力计算方法相似,因此文章将尝试应用SWMM模型针对小区居住处污水管网的水力状态进行模拟计算。为模拟动态条件下污水管网中的水力状态,将居民用水的平均日用水量,按照24小时用水统计规律进行分配。并且在污水管网模拟过程,加入了降雨径流入流污水管网的影响。文章的SWMM模型应用表明,SWMM模型可以应用于污水管网的动态计算模拟,并且可以评价雨水入流对污水管网运行的影响。展开更多
In this paper,a correlation model between centrifugal compressor and its piping system is built based on plenum chamber model and throttle valve model.This model could be used to conduct numerical analysis of compress...In this paper,a correlation model between centrifugal compressor and its piping system is built based on plenum chamber model and throttle valve model.This model could be used to conduct numerical analysis of compressor systems from steady to surge operating points.Three dimensional unsteady numerical simulations were performed to predict the performance of a centrifugal compressor.The flow structures in blade passage and diffuser were plotted and analyzed.The fluctuations of pressure and mass flow rate over time at the outlet of diffuser are obtained at surge condition.The characteristic changes of compressor-pipe network under the surge condition were carried out,and the effects of model characteristics including valve coefficient and backpressure on surge were analyzed.展开更多
文摘针对郑州市高新区城市排水特点,应用暴雨洪水管理模型(stom water management model,SWMM)模型建立城市排水模型,其中下渗模型采用径流曲线数(soil conservation service curve number,SCS-CN)法体现城市下垫面对城市内涝的影响。利用该模型对不同重现期实测降雨条件下的超载管段和积水节点进行模拟分析:根据超载时长将超载管段划分为安全超载管段、积水超载管段和内涝超载管段;根据积水时长将积水节点划分为积水点、内涝点和洪涝点;同时根据不同重现期降雨条件下的管网流量与管网最大充满度,将超载管段分为4种情况。研究结果表明:模型能较好地模拟郑州市高新区城市暴雨内涝情况,但高新区雨水管网系统不能很好地应对郑州市排水规范中的设计重现期暴雨;郑州市高新区排水管网超载管段和积水节点产生原因各有不同,但二者具有紧密的正相关关系,超载管段两端的节点更易产生溢流,由此形成4个明显的易涝区。
文摘SWMM模型(Storm Water Management Model)通常应用于降雨径流和雨水管网的数学模拟。SWMM模型中雨水管网水力学的计算方法和污水管网水力计算方法相似,因此文章将尝试应用SWMM模型针对小区居住处污水管网的水力状态进行模拟计算。为模拟动态条件下污水管网中的水力状态,将居民用水的平均日用水量,按照24小时用水统计规律进行分配。并且在污水管网模拟过程,加入了降雨径流入流污水管网的影响。文章的SWMM模型应用表明,SWMM模型可以应用于污水管网的动态计算模拟,并且可以评价雨水入流对污水管网运行的影响。
基金The National Key Basic Research Program of China(No.2012CB026000)the National Natural Science Foundation of China(No.51776155)
文摘In this paper,a correlation model between centrifugal compressor and its piping system is built based on plenum chamber model and throttle valve model.This model could be used to conduct numerical analysis of compressor systems from steady to surge operating points.Three dimensional unsteady numerical simulations were performed to predict the performance of a centrifugal compressor.The flow structures in blade passage and diffuser were plotted and analyzed.The fluctuations of pressure and mass flow rate over time at the outlet of diffuser are obtained at surge condition.The characteristic changes of compressor-pipe network under the surge condition were carried out,and the effects of model characteristics including valve coefficient and backpressure on surge were analyzed.
