新型非插入式流量测量原理的研究

非插入式流量检测方法在不破坏系统工作状态的情况下,可对化工生产进行流量测量以及化工管道系统故障诊断、故障定位。该非插入式测量方法利用变形法原理,采用应变测量技术测量重力场下流体对管道作用产生的应变,推导出应变率与质量流量的关系;结合弹性力学和材料力学推导出管壁应变差与质量流量存在典型的线性关系;然后运用Workbench建立仿真模型并通过单向流固耦合的仿真方法,对理论计算进行验证;最后在管路综合特性实验台布置应变片连接到uT7110Y静态应变仪,记录相应数据,根据数据拟合结果说明应变差与质量流量具有很好的线性关系,能够利用该特性进行非插入式质量流量的测量。

Study on the principle of the new type of non-inserted flow measurement

Non-inserted flow detection is so significant for the fault location of flow measurement and fault diagnosis of chemical pipeline system without destroying the system working condition. The non-inserted measurement uses the deformation principle and strain measurement under gravity field of pipeline fluid, and deduces the linear relationship between the differential strain and mass flow basing on the material mechanics. And then ANSYS Workbench is adopted to establish the fluid-solid coupling model and simulate the linearity of differential strain and mass flow. Finally, the strain gauges arranged in the pipeline experiment platform are connected into the static strain meter of uT7110Y. The experimental results show a good linear relationship between the differential strain and the mass flow is existed, which can provide a new way to measure flow non-inserted.