The starting flow due to a suddenly applied pressure gradient in a parallel plate channel which is rotating as a system is studied. Exact analytic series solutions to the unsteady Navier-Stokes equations are found by ...The starting flow due to a suddenly applied pressure gradient in a parallel plate channel which is rotating as a system is studied. Exact analytic series solutions to the unsteady Navier-Stokes equations are found by both the Laplace transform method and the separation of parameters method, the latter is shown to be superior. Rotation not only induces a secondary transverse flow but also alters the character of the transient flow rate and velocity profiles. Back flow and inertial oscillations occur, especially at higher rota- tion rates.展开更多
为了提高垃圾焚烧发电厂汽水系统的自动化水平,设计了一种汽水系统一键启动及自动控制系统,与光大环境有限公司的一垃圾焚烧发电厂建设项目相结合,同现有技术相比,系统采用机组级、功能组级、单元级3层控制结构,并遵循断点分层控制原则...为了提高垃圾焚烧发电厂汽水系统的自动化水平,设计了一种汽水系统一键启动及自动控制系统,与光大环境有限公司的一垃圾焚烧发电厂建设项目相结合,同现有技术相比,系统采用机组级、功能组级、单元级3层控制结构,并遵循断点分层控制原则,通过主控单元进行整体协同控制,同时采用PROFIBUS(Process Field Bus,过程现场总线)传输数据,简化了控制流程,有效提升了控制精准度、效率及自动化程度,也为机组汽水系统的一键启动及自动控制提供了参考。展开更多
文摘The starting flow due to a suddenly applied pressure gradient in a parallel plate channel which is rotating as a system is studied. Exact analytic series solutions to the unsteady Navier-Stokes equations are found by both the Laplace transform method and the separation of parameters method, the latter is shown to be superior. Rotation not only induces a secondary transverse flow but also alters the character of the transient flow rate and velocity profiles. Back flow and inertial oscillations occur, especially at higher rota- tion rates.
文摘为了提高垃圾焚烧发电厂汽水系统的自动化水平,设计了一种汽水系统一键启动及自动控制系统,与光大环境有限公司的一垃圾焚烧发电厂建设项目相结合,同现有技术相比,系统采用机组级、功能组级、单元级3层控制结构,并遵循断点分层控制原则,通过主控单元进行整体协同控制,同时采用PROFIBUS(Process Field Bus,过程现场总线)传输数据,简化了控制流程,有效提升了控制精准度、效率及自动化程度,也为机组汽水系统的一键启动及自动控制提供了参考。
