Flow field visual measurement experimental device based on matched index of refraction

Abstract

The invention discloses a flow field visual measurement experimental device based on matched index of refraction. The device comprises a main loop system, a first cooling loop system, a second coolingloop system and a bypass branch. The bypass branch divides the main loop system into a first part and a second part, the first cooling system is located at the first part, the second cooling loop system is located at the second part, and the first part includes a liquid tank, a conventional centrifugal main pump and a main heat exchanger, the first cooling system also includes a main heat exchanger, the first cooling system takes away the heat generated by working of the conventional centrifugal main pump on fluid through the main heat exchanger so as to control the temperature of the main loop system, the second part includes an electromagnetic flowmeter and a test section, the second cooling loop system is set between the electromagnetic flowmeter and the test section, and the second cooling loop system is set for controlling the fluid temperature of the test section, and the bypass branch regulates the flow passing through the test section.

Description

technical field [0001] The invention relates to the technical field of flow field visualization measurement, in particular to a flow field visualization measurement technology based on refractive index compensation. Background technique [0002] Visual measurement of turbulent flow field under complex geometric conditions is a difficult problem in fluid mechanics. Under complex geometric conditions, it is necessary to use high-precision refractive index compensation technology (Matched Index of Refraction, MIR), using high-transmittance transparent solid materials and liquid materials, to achieve an optical barrier-free optical path, so that the laser used for visual measurement It can reach the measurement position smoothly and realize the visual measurement of the flow field. In this way, the shielding of the laser light needed for optical measurement by the opaque material is avoided, and the refraction of the laser light by the transparent material with a different refr...

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Problems solved by technology

[0012]2. The flow rate of the pump in the experimental device was 700 cubic meters per hour, which greatly exceeded the maximum flow rate of 50 cubic meters per hour required for nuclear fuel assembly research, resulting in Eliminate the waste of the experimental device function;

[0013]3. There is no bypass branch in the whole experimental device, so the flow through the test section cannot be precisely adjusted;

[0014]4. There is no rectification net downstream of the rectifier, which cannot guarantee that the inlet of the test section is a uniform inlet velocity boundary condition;

[0015]5. The cooling system adopts the method of covering the cooling water coil on the pipe to control the temperature of the fluid passing through the test section. The temperature control is not accurate enough, resulting in refraction The rate compensation effect is poor;

[0016]6. There is no filter in the experimental device, which cannot filter dust and other impurities in the experimental device;

[0017]7. There is no membrane deaerator in the experimental device, so the oxygen mixed in the experimental device cannot be efficiently removed;

[0018]8. Use the method of chemical reducing agent to remove the oxygen in the experimental device, so that the chemical composition of the sodium iodide aqueous solution is changed, and the refractive index of the sodium iodide aqueous solution is caused influence, reducing the effect of refractive index compensation

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