Numerical simulation method for multi-field coupling induced electromotive force of electromagnetic flow sensor

Abstract

The invention relates to a numerical simulation method for the multi-field coupling induced electromotive force of an electromagnetic flow sensor. The method comprises the steps of determining a three-dimensional space dimension; adding a physical field interface according to the action mechanism of the electromagnetic flow sensor; constructing a geometric model; defining the material attribute ofeach part of the sensor; modifying the setting of each physical field, and defining boundary conditions; performing grid division; adding research types and carrying out calculation and solution; andfinally, carrying out post-processing on a calculation result to obtain a required physical quantity, especially a coupling induced electromotive force. The flow field and magnetic field distributionin the sensor can be obtained through simulation according to the actual structural size of the electromagnetic flow sensor, and the induced electromotive force is obtained by directly coupling the flow field and the magnetic field simulation result; no idealized assumption is needed, compared with induced electromotive force obtained through calculation based on a weight function formula and other methods, the induced electromotive force better conforms to the actual situation, the simulation result of the electromagnetic flow sensor is more accurate, and related research on structural optimization design of the sensor is facilitated.

Description

technical field [0001] The invention relates to the technical field of flow sensors, in particular to a numerical simulation method for multi-field coupling induced electromotive force of an electromagnetic flow sensor. Background technique [0002] The electromagnetic flow sensor is a detection instrument for measuring the volume flow of conductive liquid according to Faraday's law of electromagnetic induction. When passing through the measuring pipe, the magnetic force line will be cut to generate an electric potential, and the electric potential difference is obtained through the electrodes to obtain the induced electromotive force; when the sensor’s measuring pipe and the magnetic circuit structure parameters are different, the flow field and magnetic field distribution characteristics in the sensor will change, so the flow The induced electromotive force generated by the coupling of the field and the magnetic field will change accordingly, which will directly affect the...

AI Technical Summary

Problems solved by technology

But at present, there is only the theoretical formula of the weight function of the circular tube point electrode, so this method is only suitable for the calculation of the induced electromotive force of the circular tube point electrode electromagnetic flow sensor, and cannot be used for the calculation of the non-circular indented electromagnetic flow sensor

At the same time, the method replaces the induced electromotive force of the actual structural size with the result of the two-dimensional induced electromotive force, and ignores the actual structural size of the electrode, which is different from the actual working condition of the sensor. Therefore, the calculation method of the induced electromotive force has great limitations. sex

Images