After years of research

the energy efficiency of energy recovery device has been raised to a high level

but the salinity mixing has not been effectively improved. Mixing will lead to a rise of high-pressure seawater salinity

which will increase the operating cost. In this paper

the computational fluid dynamics (CFD) simulation of the rotary energy recovery device (RERD) is carried out. It is found that the unstable flow caused by the non-parallel between the channel and the flow direction of fluid is an important reason for mixing. After the inclined channel structure is adopted

the non-parallel problem is improved. The formation of unstable flow is effectively controlled. Under the commercial product operating conditions

the volumetric mixing of the optimized device is reduced from 3.34% to 1.29%

showing the effectiveness of the structure.