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Time difference type supersonic wave flow measuring method and device

A flow measurement device and flow measurement technology, which can be used in measurement devices, flow measurement/mass flow, liquid/fluid solid measurement, etc., and can solve problems such as large measurement errors

Inactive Publication Date: 2015-12-16
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the transit-time ultrasonic flowmeter assumes that the fluid flow velocity of the ultrasonic beam on the propagation path is uniform, but in fact the velocity distribution of the fluid is related to the flow state, and the velocity distribution on the cross-section of the circular tube is a rotating parabola in laminar flow , the velocity distribution on the cross-section of the circular tube is boss-shaped when the flow is turbulent, so it will inevitably cause a large measurement error

Method used

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  • Time difference type supersonic wave flow measuring method and device
  • Time difference type supersonic wave flow measuring method and device
  • Time difference type supersonic wave flow measuring method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: the flow measurement method is as follows:

[0036] The propagation time difference of the ultrasonic beam along the downstream and upstream is:

[0037] Δ T = T 2 - T 1 = 2 s i n θ ∫ 0 R [ 1 c - u c o s θ - 1 c + u c o s θ ] d r - - - ( 1 )

[0038] When the measured flow is laminar f...

Embodiment 2

[0092] Example 2: figure 2 Among them, the ultrasonic sensor is arranged in a V shape, the downstream ultrasonic sensor 4 is on the same side as the upstream ultrasonic sensor 5, and the downstream ultrasonic sensor 4 is located on the lower side of the upstream ultrasonic sensor 5; the others are the same as in Embodiment 1.

Embodiment 3

[0093] Example 3: image 3 It is a W-shaped layout structure diagram of the ultrasonic sensor of the present invention. The downstream ultrasonic sensor 4 is on the same side as the upstream ultrasonic sensor 5, and the downstream ultrasonic sensor 4 is located two V-shaped distances below the upstream ultrasonic sensor 5; the others are the same as in Embodiment 1.

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Abstract

A time difference type supersonic wave flow measuring method and device belongs to a flow measuring method and device; speed distribution of real fluid is related to flow states, speed distribution on a circular pipe cross section in laminar flow is a rotation parabolic type, and speed distribution on a circular pipe cross section in turbulent flow is a boss type; supersonic wave carries fluid flow speed information when propagating in a flowing fluid, so the fluid flow speed can be detected according to received supersonic wave, and is converted into flow; a time difference type supersonic wave flow meter can calculate the flow through measuring the time difference of the supersonic wave beam in a forward flow and counter current propagation process; if the flow speed of the supersonic wave in a propagation path is assumed to be uniform, large measuring errors can be caused, and the time difference type supersonic wave flow measuring method can obtain the flow with more accuracy; the advantages are that the time difference type supersonic wave flow measuring method is reliable in theory, simple in device, reliable in method, convenient to implement, high in measuring precision, can improve the measuring result by 5-33%, and is suitable for all supersonic wave flow meters measuring flow according to propagation time difference.

Description

technical field [0001] The invention relates to a flow measurement method and device, in particular to a time-difference ultrasonic flow measurement method and device. Background technique [0002] The time difference method ultrasonic flowmeter is to determine the flow velocity of the measured fluid by measuring the propagation time difference of the ultrasonic wave with the upstream and downstream. When the ultrasonic wave propagates in the flowing fluid, it carries the information of the fluid flow rate. The flow velocity of the fluid is detected and converted into a flow rate. At present, the transit-time ultrasonic flowmeter assumes that the fluid flow velocity of the ultrasonic beam on the propagation path is uniform, but in fact the velocity distribution of the fluid is related to the flow state, and the velocity distribution on the cross-section of the circular tube is a rotating parabola in laminar flow , the velocity distribution on the cross-section of the circul...

Claims

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Application Information

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IPC IPC(8): G01F1/66
CPCG01F1/66
Inventor 郭楚文王信用王凤超
Owner CHINA UNIV OF MINING & TECH
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