Electromagnetic flow meter scale signal scope of research

Abstract: the electromagnetic flowmeter signal range scale research information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. With the development of flow metering industry, plug-in electromagnetic flowmeter with its advantages of low cost, easy installation and maintenance are widely used in large diameter pipeline flow measurement. Although plug-in electromagnetic flowmeter measurement belongs to point measurement, but with probe the insert pipe. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the study of the electromagnetic flowmeter scale signal scope article details. With the development of flow metering industry, plug-in electromagnetic flowmeter with its advantages of low cost, easy installation and maintenance are widely used in large diameter pipeline flow measurement. Although plug-in electromagnetic flowmeter measurement belongs to point measurement, but with insert pipe probe that the two electrodes on the sensors to collect signals, it is detected of fluid in the area of information. Nowadays, most people with fluid mechanics method ( CFD) Flow field simulation research, and the use of zui to a wide range of numerical solution is finite volume method, the simulation software to help - in this paper ENT is based on this. And a lot of people in the use of CFD method plug-in electromagnetic flowmeter flow field simulation, often cannot determine its calculation domain in the pipeline, led to the signal simulation is difficult to achieve. For this kind of situation, this article by FLUENT software to three dimensional numerical simulation of the flow field in the pipeline, puts forward the concept of signal scope and determination method. The basic principle of 1. 1 signal scope according to the definition of a plug-in working principle of electromagnetic flowmeter, the farther the distance between the electrode area, the magnetic induction intensity; When far into the distance, in the fluid cutting line magnetic induction electromotive force generated by the weak to won't affect fluid test results. So for large diameter pipes, plug-in electromagnetic flowmeter sensor probe electrode can detect traffic signal measured pipe sensor probe is actually a space near the area of electrical signals, and not to cover the entire pipeline. So, in this paper, the signal range to make a clear definition. Signal scope refers to a space near electrode area, the area cutting line magnetic induction electromotive force generated by the conductive fluid, is crucial for flow test results. 1. 2 equivalent radius R is defined in the flow field, the stronger the signal, the more likely it is to be the electrode to receive, based on the size of each point of the signal is associated with the velocity of flow through that point, the plug-in electromagnetic flowmeter due to probe insert lead to changes in the flow field distribution, so the knowable electrode is not in the surrounding of equidistance acquisition signal effectively, that is, the actual signal scope is irregular area. In order to facilitate research, defined the equivalent signal range in the following way. A around the electrode has a radius R of the spherical area of VR, make it with the actual signal's contribution to the signal range are equivalent, namely content type ( 1) 。 （ 1) Type ( 1) , & Pi; For fluid in the flow field in the cutting of magnetic induction line contribution to signal the actual overall area, VR as with electrodes are of its area, its radius R is defined as the equivalent radius, & Phi; （ x, y, z) Is the signal of contribution per unit volume of fluid flow space. Just make sure the equivalent radius R, can be expressed by the equivalent signal scope VR. 1. 3 equivalent radius R research method according to the calculating formula of volume flow: QV = AU ( 2) Type ( 2) U mean in the cross section of A surface average flow velocity. In instrument when measuring the actual velocity should be detected signal role within the scope of the overall average flow velocity, instrument conversion coefficient K is obtained by standard device verification, can put the signal role within the scope of the overall average flow velocity into where electrode zui small cross section pipe ( Zui small section) The face of the average flow velocity, and flow rate value is calculated. So when the simulation can be within the scope of the average flow velocity signal role instead of zui small cross section of average flow velocity, through the principle to solve the signal scope and validation. 1. 4 equivalent radius R analysis steps on the determination of the equivalent radius R to insert the probe with FLUENT soft ware of large diameter pipeline to carry on the numerical simulation. Steps as follows: (1) finding a way under the stream velocity U, different radius r and the radius of the spherical area within the scope of the relationship between the average flow velocity; (2) zui small section continuity equation obtained according to the theory of average flow velocity. (3) interpolation method is used to determine the signal scope under the flow velocity equivalent radius R. (4) repeat this change flow velocity simulation experiment. Signal scope determination method 2. 1 determine the computational domain in order to ensure the quality of the grid, the choice is widely used in engineering, the structure is relatively simple cylindrical electrode probe as the simulation object, two computational domain is shown in figure 1. Set on the basis of guarantee the straight pipe before and after, under normal temperature atmospheric pressure to flow medium, water inlet boundary conditions for speed entrance, exit pressure boundary condition for export, choose standard k - ε Model for turbulence model, the empirical constant C1 & epsilon; 、C2ε 、C3ε Take 1 respectively. 44, 1. 92, 0. 09, turbulent kinetic energy and dissipation rate 1, respectively. 0 s and 1 s. 3. According to the concept of signal range, as long as the probe can detect traffic signals, shows that its flow must be within the scope of the magnetic field, the average speed of the computational domain is:

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