A method for measuring pressure drop of magnetic fluid in liquid metal pipeline under strong magnetic field

Abstract

The invention provides a method for measuring the pressure drop of liquid metal pipe flow magnetic fluid under a high-intensity magnetic field. According to the method, liquid metal flows in a steel pipe, the direction of the magnetic field is perpendicular to the flowing direction, electrodynamic potentials are generated on the two sides of the steel pipe, and measurement can be conducted by installing potential probes on the two sides of the steel pipe. The potential difference obtained through measurement is subjected to theoretical calculation, and then pressure gradient information at the position of the pipe is directly obtained. When neither the magnetic filed in the direction of the pipe nor the pipe changes, the pressure gradient keeps constant, and the pressure drop of an inlet and an outlet of the pipe is directly obtained by multiplying by the pressure gradient by the length of the pipe. For a round pipe, the relational expression of the pressure gradient and the potential difference is independent of physical property parameters and the flow speed of the liquid metal inside the pipe and only dependent on the size of the pipe, the physical property parameters and parameters of the magnetic field, and therefore pressure drop measurement under various flowing conditions can be completed only by measuring the potential difference of the two sides of the wall of the pipe. The method has the advantages that measurement is conducted without invasion into the fluid, flowing of the fluid is not disturbed, superhigh temperature fluid can be borne, and the measurement process is convenient and simple.

Description

technical field [0001] The invention relates to the technical field of liquid metal pressure drop measurement, in particular to a method for measuring the pressure drop of magnetic fluid in a liquid metal pipeline under a strong magnetic field. Background technique [0002] Pressure drop measurement is an important part of thermal hydraulic measurement. In a magnetic confinement fusion reactor, the liquid metal cladding is in a strong magnetic field environment, and its flow presents a special magnetic fluid (MHD) effect, among which the MHD pressure drop is the most important MHD effect. Under the action of a strong magnetic field, the flowing liquid metal cuts the magnetic field and generates an induced current, which forms a Lorentz force under the action of the magnetic field, hindering the fluid flow and forming an MHD pressure drop. According to the strength of the magnetic field, the pressure drop will be 10 to 100 times larger than the flow pressure drop of ordinary...

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Problems solved by technology

When used for a long time, the diaphragm is exposed to high-temperature liquid metal, and its deformation performance and accuracy are reduced after being corroded

And during the shutdown period, some liquid metal may solidify on the diaphragm, which will affect its deformation accuracy for a long time

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