The Application Of A Plug-in Electromagnetic Flowmeter In An Asymmetric Flow Field

Flow measurement plays an important role in the different operation of industrial production.The insertion electromagnetic flow sensor is developed on the basis of electromagnetic flow sensor.It is a kind of fluid measuring instrument which has the advantages of small weight,low price,easy to install and repair as well as good high cost performance.These advantages make it very suitable for the flow measurement of large diameter pipeline.The most important is that the same specifications of the insertion electromagnetic flow sensor can be used for the flow measurement of a variety of diameter pipelines.The working principle of the insertion electromagnetic flow sensor is based on the Faraday's law of electromagnetic induction.The fluid flow in the pipe is cutting magnetic induction line and producing induction electromotive force by the time of flowing the insertion electromagnetic flow sensor.Electrode detected electrical signal and converted it to fluid signal by converter.Basing on the research of flow field around a cylinder,this paper analyzes the reasons of signal instability when traditional cylindrical insertion electromagnetic flow sensor is measuring.Proposing the method of using elliptical flow sensor instead of cylindrical flow sensor can improve stability and compare their stability by experiments.Design the elliptical insertion electromagnetic flow sensor and manufacture it.In order to research the optimal measuring position of the elliptical insertion electromagnetic flow sensor in asymmetric flow field,this paper compares simulated data by FLUENT software and experimental data and makes curve fitting by MATLAB software to find the optimal measuring position of the elliptical insertion electromagnetic flow sensor in asymmetric flow field finally.