排灌机械工程学报
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排灌机械工程学报  2019, Vol. 37 Issue (2): 148-153    DOI: 10.3969/j.issn.1674-8530.16.0223
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用于幂律流体螺旋槽液膜机械密封性能的解析法
陈果, 宋鹏云
昆明理工大学化学工程学院, 云南 昆明 650500
Approximate analytic analysis on performance of spiral groove liquid film mechanical seal being applied to seal power-law fluid
CHEN Guo, SONG Pengyun
Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming,Yunnan 650500, China
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摘要 为深入研究密封介质为非牛顿流体的螺旋槽上游泵送机械密封性能,以幂律流体为研究对象,基于Muijderman推导牛顿流体润滑轴承的端面压力分布表达式,把幂律流体二维定常流动雷诺方程和流量方程分别替换牛顿流体的表达形式,获得了密封端面流场的压力分布表达式,进而得到密封开启力、泄漏率等性能参数.将解析所得结果与采用Fluent模拟结果进行比较,两者数据吻合.再基于近似解析法,分别分析了稠度系数m和流性指数n对密封性能的影响,结果表明,密封开启力随流性指数n和稠度系数m的增大而增大.对于泄漏率而言,当密封胀塑性流体时,流性指数n和稠度系数m几乎没有影响.当密封假塑性流体时,处于较小膜厚时受稠度系数m和流性指数n的影响甚微,但处于较大膜厚时随流性指数n和稠度系数m增大而变大.
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陈果
宋鹏云
关键词螺旋槽   机械密封   幂律流体   上游泵送   近似解析法     
Abstract: In order to deeply analyze the performance of the spiral groove upstream pumping liquid mechanical seal when the seal medium is non-Newtonian fluid, taking power-law fluid as the research object, the Reynolds equation and the twodimensional steady flow flowing equation of Newtonian fluid were respectively replaced by the Reynolds equation and the flowing equation of power-law fluid based on Muijderman’s pressure governing equation for Newtonian liquid lubricated bearing. Then the pressure distribution and the sealing performance parameters of the seal, such as the opening force and the leakage, were obtained. A comparison was made with the results for the approximate analytic method and the numerical simulation by Fluent software and the results between the two are consistent. The influence of consistency coefficient m and flow behavior index n on the seal performance was analyzed by the approximate analytic method. The results show that the opening force increases with the increasing of the flow behavior index n and the consistency coefficient m. When the sealed medium is pseudoplastic fluid, the effect of flow behavior index n and the consistency coefficient m on the leakage is weak at small film thickness, [JP2]whereas the leakage increases with the increasing of the flow index n and the consistency coefficient m at large film thickness. The effects of flow behavior index n and the consistency coefficient m on the leakage can be ignored when the sealed medium is bulging plastic fluid.
Key wordsspiral groove   mechanical seal   power-law fluid   upstream pumping   approximate analytic method   
收稿日期: 2016-09-21;
基金资助:昆明理工大学学科方向团队资助项目
引用本文:   
陈果,宋鹏云. 用于幂律流体螺旋槽液膜机械密封性能的解析法[J]. 排灌机械工程学报, 2019, 37(2): 148-153.
CHEN Guo,SONG Peng-Yun. Approximate analytic analysis on performance of spiral groove liquid film mechanical seal being applied to seal power-law fluid[J]. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(2): 148-153.
 
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