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磁力耦合式高压流变仪测试系统测试参数修正
刘刚1,周莹1,苗青2,张永祥3,李秉繁1
(1.中国石油大学(华东)山东省油气储运安全省级重点实验室,山东青岛 266580;2.中国石油油气储运重点实验室,河北廊坊 065000;3.中国石油管道局工程有限公司,河北廊坊 065000)
摘要:
磁力耦合式旋转流变仪因内、外磁环磁力耦合而导致内外磁环转动不同步,存在延迟启动问题,造成流变仪测试数据出现较大偏差。为解决这一问题,根据流变仪内、外磁环扭矩平衡以及内外磁力耦合特性,建立磁力耦合式旋转流变仪传动过程物理模型,并以HAAKE-MARS 60高压流变仪为例,对牛顿流体恒剪切率加载条件下测量参数进行修正。结果表明:测试物料黏度越大,剪切速率越小,内转子转速波动幅度越大,内转子表面真实剪切应力越小于外磁环剪切应力;因区分了流变仪马达扭矩和作用于流体的负载扭矩,以及考虑了测试过程中内、外磁环转速的差别,黏度修正值较接近于真实黏度,且黏度越大,剪切速率越高,黏度修正效果越好;很好地解决了高压流变仪测试系统下流变测试结果“失真”问题。
关键词:  磁力耦合  扭矩传递  黏度修正  响应滞后
DOI:10.3969/j.issn.1673-5005.2019.04.015
分类号::TE 832; TH 836
文献标识码:A
基金项目:国家自然科学基金项目(51574274,5,51704319)
Correction of test parameters for magnetic coupling high pressure rheometer testing system
LIU Gang1, ZHOU Ying1, MIAO Qing2, ZHANG Yongxiang3, LI Bingfan1
(1.Shandong Provincial Key Laboratory of Oil & Gas Storage & Transportation Safety in China University of Petroleum(East China),Qingdao 266580, China;2.PetroChina Key Laboratory of Oil & Gas Storage and Transportation, Langfang 065000, China;3.PetroChina Pipeline Engineering Company Limited, Langfang 065000, China)
Abstract:
Due to the magnetic coupling between the internal and external magnetic rings, the rotation of the two rings is not synchronous, therefore the problem of delayed start-up occurs, which results in large deviation of the rheometer test data. In order to solve this problem, according to the torque balance of the internal and external magnetic rings and the coupling characteristics of the internal and external magnetic forces, a physical model of the transmission process of the magnetic coupling rotary rheometer was established. The high pressure rheometer, HAAKE-MARS 60 was used to correct the measurement parameters of the Newtonian fluid under the condition of constant shearing rate.The results show that the true shear stress on the surface of the internal magnetic ring becomes much bigger than that of the external ring, with the increase of the viscosity of the tested material, the decrease of the shear rate, and the increase of the fluctuation amplitude of the internal rotor speed. It is found that the viscosity correction value is close to the true viscosity,as the difference between the motor torque of the rheometer and the load torque acting on the fluid is considered, as well as the difference between the rotational speed of the internal and external magnetic rings during the test. The higher the viscosity, the higher the shear rate, and the better the viscosity correction effect is. Altogether, the problem of "distortion" of rheological test results under the high-pressure rheometer test system has been solved successfully.
Key words:  magnetic coupling  torque transfer  viscosity correction  lags in response
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