| In this paper, based on the engineering background of the reverse osmosis membrane seawater (brackish water) desalination system, the rotary energy recovery device was researched. The fluid energy recovery process of the high and low pressure fluid in the rotary energy recovery device was studied. Focused on the end surface leakage loss and fluid resistance loss of the energy recovery process, the theoretical analysis and experimental research were taken to study on the fluid energy recovery efficiency of the rotary energy recovery device.The fluid flow characteristics in end surface gap were analyzed, which showed the way of leakage in the end surface gap. According to the infinite flat slit flow theory, the fluid leakage formula of the end surface gap was established. The formula consisted of the differential pressure leakage and shear leakage in the end surface gap, which were the main leakage ways.The fluid flow characteristics of the high and low pressure fluid in the rotary energy recovery device were analyzed, and the fluid resistance loss caused by the fluid flow in the device was calculated. The formula of fluid frictional resistance loss and the local resistance loss were also established.According to the way of fluid energy loss in the energy recovery process, the energy recovery efficiency computational model formula of the rotary energy recovery device were established, which comprised of the end surface gap leakage and the fluid resistance loss.Designed a rotary energy recovery device based on the energy recovery efficiency, and established an integrated performance experimental system to test the rotary energy recovery device. Through the orthogonal experiment, the relations of energy recovery efficiency with the fluid pressure and flow rate were presented. By comparatively analyzing the experimental and the theoretical energy recovery efficiency, the accuracy and reliability of the energy recovery efficiency computational model formula were verified. |
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