王 越 ,张 衡 ,周 杰 ,孙 政 ,徐世昌
AuthorsHTML:王 越 ^{1, 2, 3}，张 衡 ^{1, 2, 3}，周 杰 ^{1, 2, 3}，孙 政 ^{1, 2, 3}，徐世昌 ^{1, 3}
AuthorsListE:Wang Yue ,Zhang Heng,Zhou Jie,Sun Zheng,Xu Shichang
AuthorsHTMLE:Wang Yue ^{1, 2, 3}，Zhang Heng^{1, 2, 3}，Zhou Jie ^{1, 2, 3}，Sun Zheng^{1, 2, 3}，Xu Shichang ^{1, 3}
Unit:1. 天津大学化工学院，天津 300350；
2. 化学工程联合国家重点实验室(天津大学)，天津 300350；
3. 天津市膜科学与海水淡化技术重点实验室，天津 300350

Unit_EngLish:1. School of Chemical Engineering and Technology，Tianjin University，Tianjin 300350，China；
2. State Key Laboratory of Chemical Engineering，Tianjin University，Tianjin 300350，China；
3. Tianjin Key Laboratory of Membrane Science and Desalination Technology，Tianjin 300350，China

Abstract_Chinese:转盘式能量回收装置(RERD)采用转盘旋转与滑阀协调响应的工作模式实现反渗透海水淡化中浓盐水压力 能的连续回收．其中滑阀控制流体流动的方向和流量，它主要的性能要求是切换过程的可靠性．但滑阀中阀杆在偏心 和倾斜时与阀套形成的配合间隙不均匀变化会产生不平衡液压力，进而产生液压卡紧并影响滑阀切换的响应性 能．针对这一问题，构建了阀杆与阀套的间隙液膜仿真模型，采用 CFD 方法模拟探究了间隙液膜的力学特性，并引 入均压槽和通腔浅槽改善液压卡紧现象．结果表明：阀杆偏心时，间隙液膜形成的每个压力差区段的最大压力差位 于高压液体侧，其形成的液压力使阀杆有自动对中的倾向；阀杆倾斜时，间隙液膜中压力差区段的最大压力差在各 区段的中间位置，其液压力产生的倾覆力矩会加剧阀杆的倾斜．滑阀间隙液膜的液压力和倾覆力矩随高压流体压 力、偏斜率的增大而增大．在阀杆上引入均压槽和通腔浅槽能减小间隙不均匀引起的压力差和液压力的范围，在操 作压力 6.0 MPa、配合间隙 0.015 mm 和倾斜率 1/3 的条件下，滑阀所受液压力和倾覆力矩分别较原结构降低 73.4% 和 70.8%以上．上述结果对装置中滑阀结构优化和提高滑阀响应可靠性具有指导作用．
Abstract_English:The rotary energy recovery device(RERD)is an energy-saving equipment which promotes the development and application of reverse osmosis seawater desalination technology. RERD realizes the continuous pressure energy recovery of concentrated brine in reverse osmosis seawater desalination system by adopting a working model of the rotor rotation and through the synchronous response of the slide valves. Slide valves control the direction and flow of fluid and its performance is mainly affected by its switching reliability. However，hydraulic clamping due to unbalanced hydraulic forces highly affects the response performance of slide valves causing a change of the clearances of the slide valve stem with eccentricity and inclination. As a response，simulation models of the liquid films are em\u0002ployed and the hydromechanical characteristics are investigated via CFD method. Equal pressure grooves and a through-cavity shallow groove are introduced to improve hydraulic clamping. Results reveal that when the valve stem is eccentric，the maximum pressure difference for each pressure difference section is achieved on the high-pressureside and the hydraulic force in the liquid film makes the valve stem self-centering. On the other hand，when the valve stem is inclined，the maximum pressure difference in each pressure difference section is located in the middle of each section. The overturning moment generated by the hydraulic force in the liquid film aggravates inclination level， which is prone to hydraulic clamping and blocking. The hydraulic force and its overturning moment in the liquid films increase with higher pressure and greater eccentricity/inclination rate. Reduced pressure difference and decreased generation range of the hydraulic force when inclined were achieved through the introduction of equal pressure grooves and a through-cavity shallow groove. Compared with the original structure，the hydraulic force and overturning moment are reduced by more than 73.4% and 70.8%，respectively upon applying 6.0 MPa pressure，and setting the fit clearance and inclination rate to 0.015 mm and 1/3，respectively. The results acquired from this paper hope to provide guidance in the optimization of the structures of slide valves and in the improvement of the reliability of their response.
Keyword_Chinese:海水淡化；转盘式能量回收装置；滑阀间隙模型；力学特性；优化设计；计算流体力学
Keywords_English:erty；optimal design；computational fluid dynamics(CFD)

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