针对如何有效利用智能电网产生的海量数据问题,文中开发了基于国家电网公司企业统一信息模型(State grid-common information model,SG-CIM)的企业数据库模型系统,实现了系统之间的信息交互,电网的可视化操作,对电网相关业务进行分析管...针对如何有效利用智能电网产生的海量数据问题,文中开发了基于国家电网公司企业统一信息模型(State grid-common information model,SG-CIM)的企业数据库模型系统,实现了系统之间的信息交互,电网的可视化操作,对电网相关业务进行分析管理,包括故障抢修,业务处理,电力分析计算等。首先,基于企业的业务领域不同,将其划分为12个主题域,并细致化每个主题的属性;其次,针对企业实际情况,分析企业数据库的设计需求,并对其进行具体的设计;最后采用Enterprise Architect软件对电网企业数据库进行UML建模,并将开发的系统应用于电网公司,实际应用效果验证了开发系统的有效性以及可靠性。展开更多
In order to account for the effect of particle existence on gas-particle turbulence flow in large-eddy simulation (LES),a new gas-particle turbulent kinetic energy subgrid-scale (SGS) turbulence model is established,a...In order to account for the effect of particle existence on gas-particle turbulence flow in large-eddy simulation (LES),a new gas-particle turbulent kinetic energy subgrid-scale (SGS) turbulence model is established,and the effect of particle wake is also considered in gas turbulent kinetic energy SGS turbulence model.Simulation of gas-particle turbulence flow in backward-facing step is carried out by LES using present model and by unified second-order moment (USM) model.The prediction statistical results including mean velocity and fluctuation velocity by LES using present model are in reasonable agreement with the experimental results.It is shown that present model is with higher calculating accuracy than USM model,which indicates that the turbulent kinetic energy SGS turbulence model is suitable.展开更多
文摘针对如何有效利用智能电网产生的海量数据问题,文中开发了基于国家电网公司企业统一信息模型(State grid-common information model,SG-CIM)的企业数据库模型系统,实现了系统之间的信息交互,电网的可视化操作,对电网相关业务进行分析管理,包括故障抢修,业务处理,电力分析计算等。首先,基于企业的业务领域不同,将其划分为12个主题域,并细致化每个主题的属性;其次,针对企业实际情况,分析企业数据库的设计需求,并对其进行具体的设计;最后采用Enterprise Architect软件对电网企业数据库进行UML建模,并将开发的系统应用于电网公司,实际应用效果验证了开发系统的有效性以及可靠性。
基金the National Natural Science Foundation of China (Nos.50736006 and 51066006)the Aero-Science Fund (No.2009ZB56004)the Jiangxi Provincial Natural Science Foundation (Nos.2009GZC0100 and 2008GZW0016)
文摘In order to account for the effect of particle existence on gas-particle turbulence flow in large-eddy simulation (LES),a new gas-particle turbulent kinetic energy subgrid-scale (SGS) turbulence model is established,and the effect of particle wake is also considered in gas turbulent kinetic energy SGS turbulence model.Simulation of gas-particle turbulence flow in backward-facing step is carried out by LES using present model and by unified second-order moment (USM) model.The prediction statistical results including mean velocity and fluctuation velocity by LES using present model are in reasonable agreement with the experimental results.It is shown that present model is with higher calculating accuracy than USM model,which indicates that the turbulent kinetic energy SGS turbulence model is suitable.
