旋转式能量回收设备孔道内部流动特性的研究

在海水淡化领域中，旋转式能量回收设备是一种高效的能量回收装置可以有效降低系统能耗。针对旋转式能量回收设备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。研究结果表明，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。研究结果对于理解旋转式能量回收设备的孔道内部流场具有一定帮助。

Study on Flow Characteristics of the Duct in a Rotary Energy Recovery Device

The Rotary Energy Recovery Device, RERD, is a promising energy recovery device which can obviously reduce the energy consumption of the Reverse Osmosis system in seawater desalination. The flow field of the duct of a Rotary Energy Recovery Device, RERD, had been simulated by a two-dimension unsteady numerical model. The effects of the endcover rotation speed and the inlet velocity on the evolution of vortex and the mixing rate had been researched. Simulation results indicate that the formation and the motion of the vortex cause the mass transfer between the seawater stream and the brine stream. The structure size and the strength of the vortex vary with the endcover rotation speed and the inlet velocity. There is an optimal operating condition to obtain the minimum structure size of the vortex and the mixing rate of the RERD. These results would be beneficial to researchers in better understanding the flow dynamic in the duct of an RERD.