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A realization method of in-situ calibration of permanent magnet sodium flowmeter based on cross-correlation method based on error correction

An in-situ calibration, error correction technology, applied in the direction of testing/calibrating volume flow, reducing greenhouse gases, climate sustainability, etc., can solve problems such as complexity, achieve strong operability, simple implementation steps, repeatable errors improved effect

Active Publication Date: 2022-07-12
CHONGQING CHUANYI AUTOMATION
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Problems solved by technology

However, when the traffic is different, the frequency bands of the cross-correlation traffic close to the standard traffic are in different frequency bands. Therefore, different signal frequency bands need to be selected, which leads to a certain complexity in the implementation process.

Method used

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  • A realization method of in-situ calibration of permanent magnet sodium flowmeter based on cross-correlation method based on error correction
  • A realization method of in-situ calibration of permanent magnet sodium flowmeter based on cross-correlation method based on error correction
  • A realization method of in-situ calibration of permanent magnet sodium flowmeter based on cross-correlation method based on error correction

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] The design idea of ​​the invention is that the instantaneous velocity v of the turbulent flow at a certain position in the pipeline can be decomposed into the average velocity and the velocity pulsation v′, that is

[0026]

[0027] In the in-situ calibration, the electrical signal U(t) collected by the cross-correlation method is the AC signal generated by the turbulent pulsation, which is the superposition of the velocity pulsation signals at different positions on the cross section of the pipeline, namely:

[0028]

[0029]

[0030]In the formula, v'(t, r, θ) is the velocity fluctuation of a certain point (r, θ) on the cross section of the pipeline at time t, 0≤r≤d / 2, 0≤θ≤2π; B(r,θ) is the magnetic flux density; W(r, θ) is a weight function, which represents the contribution of velocity fluctuations at different positions in the pipeline to the pot...

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Abstract

A method for realizing in-situ calibration of permanent magnet sodium flowmeter cross-correlation method based on error correction. The method starts from the perspective of repeatability error correction, and through qualitative analysis and quantitative calculation, it is concluded that the low-frequency signal affects the repetition of the overall signal. Therefore, considering the correction of the repeatability error from the perspective of low-frequency filtering, and combining three key technologies, the effect of repeatability error correction can be optimal; after the repeatability error is corrected, the nonlinear error can be corrected by the quadratic function model. Software correction is performed to complete the in-situ calibration of the permanent magnet sodium flowmeter with large diameter and no vortex generator in long straight pipe sections.

Description

technical field [0001] The invention relates to the field of flow detection, in particular to a method for realizing in-situ calibration of a cross-correlation method of a permanent magnet sodium flowmeter based on error correction. Background technique [0002] In sodium-cooled fast reactors, a permanent magnet sodium flowmeter (PSMF) is commonly used to measure the flow rate of the coolant, liquid metal sodium. The permanent magnet sodium flowmeter works based on Faraday's law of electromagnetic induction, and picks up the DC induced electromotive force through two electrodes installed on the axis perpendicular to the flow direction and the magnetic field direction. The magnitude of the induced electromotive force reflects the magnitude of the fluid flow rate, namely where d is the inner diameter of the pipe, B is the magnetic flux density, and K 1 is the correction factor for the wall shunt effect caused by the conductivity of the pipe, K 2 is the correction factor fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F25/10
CPCG01F25/10Y02E30/30
Inventor 徐科军于新龙黄雅吴文凯
Owner CHONGQING CHUANYI AUTOMATION
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