超临界锅炉给水泵级间密封间隙流动特性  

Characteristics of flow through gap of interstage seal in supercritical boiler feed pump

作　　者：刘刚[1] 付强[1] 朱荣生[1] 王秀礼[1] 张本营[1] 李梦圆[1] LIU Gang;FU Qiang;ZHU Rongsheng;WANG Xiuli;ZHANG Benying;LI Mengyuan(National Research Center of Pumps,Jiangsu University,Zhenjiang,Jiangsu 212013,China)

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013

出　　处：《排灌机械工程学报》2018年第5期391-396,432,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金面上资助项目(51379091);国家自然科学基金青年资助项目(51509112);江苏省重点研发计划-产业前瞻与共性关键技术项目(BE2016160)

摘　　要：为研究超临界锅炉给水泵不同间隙下间隙流道的内部流动瞬态特性,建立不同间隙大小的间隙流道模型并对其进行数值模拟,得到间隙流道在轴向和环向上的压力、速度分布以及在进口压力脉动作用下轴向各处的压力变化情况.结果表明:在轴向上,间隙流道内液流的静压和流速具有3个阶段,分别为突降段、上升段和线性下降段,其中间隙越大,其静压越小流速越快;在间隙流道环形截面上静压的分布并不均匀,而在圆周方向上具有一定的周期性,在间隙流道环形截面上的速度的高速区主要出现在靠近内壁旋转面一侧,低速区主要出现在靠近外壁静止面一侧;在进口压力脉动作用下,间隙流道的入口、中部的压力变化频率是一致的,尾部静压主要由出口压力决定,其压力只在一定的值内上下波动.To study the characteristics of internal flow in the gap of interstage seal in supercritical boi-ler feed pumps,a few interstage seal models with various gap sizes were established and the fluid flows in these seals were simulated numerically.The pressure and velocity distributions in the axial and circumferential directions,and the pressure variation along the axial direction were calculated under a pulse inlet pressure.The results show that the fluid hydrostatic pressure and velocity have three variation stages through the seal in the axial direction,namely sharp drop,ascendant and linearly descen-dent stages.The greater the gap size is,the smaller the static pressure is,and the faster the velocity is.The static pressure distribution is not uniform in the circular cross-sections and presents a certain periodicity in the circumferential direction.In the annular cross-sections the high-velocity region appears near the rotating inner wall,but the low-velocity region occurs near the stationary outer wall.In addition,under a pulse inlet pressure,the pressure pulsating frequencies in the middle and at the outlet of the seal are the same as the frequency at the inlet.The tail pressure is mainly determined by the outlet pressure,thus it fluctuates only within a certain amplitude.

关 键 词：超临界锅炉给水泵 间隙 静压 流速 数值模拟 

分 类 号：S277.9[农业科学—农业水土工程] TH311[农业科学—农业工程]