基于双向流固耦合技术的活塞式压力计研究  

Research of Piston Gauge Based on Two-way Fluid-structure Interaction Technique

作　　者：张忠立[1,2] 王灿[1] 林正皓[1] 倪玉山 洪扁[1] 秦亭亭[1] 李雪菁[1] ZHANG Zhong-li;WANG Can;LIN Zheng-hao;Ni Yu-shan;HONG Bian;QIN Ting-ting;LI Xue-jing(Shanghai Institute of Measurement and Testing Technology,Shanghai 201203,China;Fudan University,Shanghai 200433,China)

机构地区：[1]上海市计量测试技术研究院,上海201203 [2]复旦大学,上海200433

出　　处：《计量学报》2021年第3期276-281,共6页Acta Metrologica Sinica

基　　金：国家科技部重点研发计划项目(2018YFF0212405)。

摘　　要：针对传统实验研究无法控制单一变量的不足,基于双向流固耦合技术,建立了1000 MPa简单型活塞式压力计的三维旋转模型,研究流体介质的黏度、活塞杆弹性模量以及活塞间隙对活塞式压力计压力量值复现的影响,结果表明:流体从活塞底部入口至出口的过程中,其流体压力先是近似线性快速下降至平衡压力的30%左右,再经过小范围的压力波动,最后近似线性缓慢降压至出口压力零;活塞杆弹性模量越大,流体黏度越小,活塞间隙越小,其活塞杆收缩量就越小;活塞杆弹性模量越大,流体黏度越大,活塞间隙越小,其活塞有效面积就越大,且流体黏度增大1倍,其有效面积最大增加约1.3%,对活塞有效面积影响最大,活塞杆弹性模量增大至10倍,其有效面积最大增加不足0.04%,活塞杆弹性模量对有效面积影响最小。According to the deficiency that the parameters can’t be singly controlled in the traditional experiment,a 3D rotating model of 1000 MPa simple piston gauge has been established to probe the effects of fluid viscosity,piston rod modulus and piston-cylinder gap on the pressure reproduction of piston gauge based on two-way fluid-structure interaction technique.The results show that the pressure distribution along the piston-cylinder gap from the inlet to the outlet generally experiences first approximate-linear decrease of pressure with the quick decline down to 30% of the balance pressure,then through a small pressure fluctuation,and finally approximate-linear slow decrease of pressure till to zero. The piston rod shrinkage decreases due to the increase of the elastic modulus of piston rod,the decrease of the fluid viscosity and piston-cylinder gap,while the effective area of the piston gauge increases due to the increase of the elastic modulus,the fluid viscosity,and the decrease of the piston-cylinder gap. Moreover,the effective area increases approximately 1. 3% in maximum when the fluid viscosity doubles,which affects on the effective area of piston gauge most,while the effective area increases less than 0. 04%in maximum when the elastic modulus of piston rod increases 10 times,which affects on the effective area least.

关 键 词：计量学 活塞式压力计 有效面积 流固耦合 数值仿真 

分 类 号：TB935[一般工业技术—计量学]