Fiber Bragg grating vortex shedding flow meter based on triangular prism-shaped vortex-forming body and using method thereof

A technology of vortex flowmeter and triangular prism, which is applied in the direction of volume/mass flow generated by mechanical effects, and through the detection of dynamic effects of fluid flow, etc., can solve problems such as influence, complex noise components of oscillation wake, and achieve good application prospects. The vortex signal is strong and the effect of preventing electric sparks

Inactive Publication Date: 2012-11-07
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

This detection method makes the noise components in the oscillating wake more complicated, and there are many interference signals such as sub-vortices that affect the stability of the main vortex.

Method used

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  • Fiber Bragg grating vortex shedding flow meter based on triangular prism-shaped vortex-forming body and using method thereof
  • Fiber Bragg grating vortex shedding flow meter based on triangular prism-shaped vortex-forming body and using method thereof
  • Fiber Bragg grating vortex shedding flow meter based on triangular prism-shaped vortex-forming body and using method thereof

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Experimental program
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Embodiment

[0043] The specific parameters in actual production are:

[0044] 1. Measuring tube: steel tube, Young's modulus of elasticity GPa, Poisson's ratio ; Inner diameter 100mm, outer diameter 110mm.

[0045] 2. Equal strength cantilever beam size: length l =15mm, thickness 1mm, width 20mm.

[0046] 3. Body width: 28mm.

[0047] 4. The overall length of the generating body in the flow direction: 35mm.

[0048] 5. The length of parallel edges on the sides of the generating body: 3mm.

[0049] 6. Half of the vertex angle of the cross-section of the triangular column: 19°.

[0050] 7. The base diameter of the generating body: 41.1mm

[0051] 8. The distance between the ends of the generator base: 90mm.

[0052] 9. Gap between measuring tube and base: 0.66mm.

[0053] 10. The depth of the gap between the measuring tube and the base: 6.6mm.

[0054] 11. Fiber Bragg grating technical parameters: central wavelength nm, effective elastic-optical coefficient ;

[0055] 12. T...

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Abstract

The invention relates to a fiber Bragg grating vortex shedding flow meter based on a triangular prism-shaped vortex-forming body and a using method thereof, and belongs to the technical field of photoelectronic measurement. The fiber Bragg grating vortex shedding flow meter is characterized in that the triangular prism-shaped vortex-forming body is fixed inside a measuring tube through bases at the two ends, and the two side faces at the middle part of the triangular prism-shaped vortex-forming body are communicated with each other, so as to form a pressure guide cavity; in the pressure guide cavity, a free end of a constant strength cantilever is provided with a mass block, and a fixed end of the constant strength cantilever is connected with an axial conduit inside the triangular prism-shaped vortex-forming body; and the fiber Bragg grating is stuck to the central axis of the surface of the constant strength cantilever, and the fiber Bragg grating is connected with an external fiber through an axial conduit and a fiber out-leading hole. The fiber Bragg grating vortex shedding flow meter based on the triangular prism-shaped vortex-forming body provided by the invention has the beneficial effects that by adopting the triangular prism as the vertex-forming body, very high reliability is provided for flow detection; and by adopting the fiber Bragg grating as a sensing element, the meter can resist electromagnetic disturbance, is suitable for measuring the flow of various fluid, and particularly has a very good prospect for measuring the flow of fluid with chemical corrosion.

Description

technical field [0001] The invention relates to an optical fiber Bragg grating vortex flowmeter based on a triangular column type vortex generator and a use method thereof, belonging to the technical field of optoelectronic measurement. Background technique [0002] The output of the vortex flowmeter is a pulse signal proportional to the fluid flow rate, and the pulse signal is not affected by the fluid composition, density, pressure, and temperature; the range is wide, and most vortex flowmeters have a Reynolds number of - Within the range, the applicable pipe diameter is generally below 300mm, with good linearity, and the range ratio can reach more than 10:1, and some can reach 20:1 or even 30:1. The vortex flowmeter can measure the flow of liquid, gas and steam, usually the accuracy of measuring liquid is , the flow rate range is 0.5~7m / s; the accuracy of gas measurement is , The velocity range is 5~50m / s. [0003] Li Hongmin and others proposed a new fiber grati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/32
Inventor 李川薛俊华肖锋李英娜欧阳鑫杨云飞
Owner KUNMING UNIV OF SCI & TECH
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