旋转式能量回收设备孔道内部流动特性

Flow Characteristics of the Duct in a Rotary Energy Recovery Device

在海水淡化领域中,旋转式能量回收设备(rotary energy recovery device,RERD)是一种高效的能量回收装置可以有效降低系统能耗。针对RERD建立了二维非稳态数值模型,分析了设备孔道内部的流场拓扑结构,考察了配流盘转速和进流流速两种操作参数对旋涡演化过程和掺混率的影响。结果表明:旋涡的形成和演化过程会对孔道内的质量传递过程产生重要影响;旋涡的结构尺寸和涡旋强度会随着配流盘转速或进流流速的改变而发生变化;存在最佳的操作工况使得旋涡的结构尺寸最小和设备的掺混率最低。研究结果对于理解RERD的孔道内部流场具有一定帮助。

In the field of seawater desalination,The rotary energy recovery device(RERD)is a promising energy recovery device which can effectively reduce the energy consumption of the system.A two-dimensional unsteady numerical model for RERD was established,The flow field topology inside the equipment duct was analyzed,The effects of port plate speed and inlet velocity on vortex evolution and mixing rate were investigated.The results indicate that the formation and evolution of vortices have an important impact on the mass transfer process in the channel.The structure size and vortex intensity of vortex change with the change of end cover rotation speed or inlet flow velocity.There is an optimal operating condition to minimize the vortex structure size and the mixing rate of the RERD.The results are helpful to understand the internal flow field in the duct of RERD.