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Flow measurement device based on the principle of vortex flow measurement

A flow measuring device and measuring device technology, applied in the direction of measuring flow/mass flow, measuring device, liquid/fluid solid measurement, etc., can solve the problems of complex signal processing, fluctuation, large phase difference, etc.

Active Publication Date: 2021-02-09
ENDRESS HAUSER FLOWTEC AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the phase difference has large fluctuations, so that the signal processing for determining it is very complex

Method used

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  • Flow measurement device based on the principle of vortex flow measurement
  • Flow measurement device based on the principle of vortex flow measurement
  • Flow measurement device based on the principle of vortex flow measurement

Examples

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Embodiment Construction

[0021] as attached figure 1 An example of an embodiment of a flow measuring device 1 according to the invention operating on the principle of a vortex counter is shown in , comprising a measuring tube 2 with an inner diameter d, in which a bluff body 4 of width b is arranged, in particular with respect to the containing measuring tube The plane of symmetry of the longitudinal axis extends symmetrically. The bluff body 4 is connected at its two ends to the measuring tube 2 . The bluff body 4 is used in measuring operation to generate a Karman vortex street with a flow-dependent vortex frequency in the medium flowing in the measuring tube.

[0022] In order to record the vortex frequency, flow measuring devices operating according to the vortex counter principle in the field of the invention have a pressure fluctuation measuring device for recording pressure fluctuations produced by the vortex street. The flow measuring device 1 according to the invention comprises two such pr...

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Abstract

The invention relates to a flow meter (1) based on the principle of vortex flow measurement, comprising: a measuring tube (2); a bluff body (4) in the measuring tube (2) for generating a card with a flow-dependent vortex frequency Mann vortex layer; first pressure fluctuation measuring means (12, 14) for detecting and signaling eddy related pressure fluctuations and for providing a pressure fluctuation dependent signal; second pressure fluctuation measuring means (16, 18), for detecting and signaling swirl related pressure fluctuations and for providing a pressure fluctuation dependent signal; and an evaluation unit (20) for determining a swirl frequency and a flow measurement based on the swirl frequency. The evaluation unit (20) is also designed to use the signal amplitude ratio of the first pressure fluctuation measuring device (12, 14) and the second pressure fluctuation measuring device (16, 18) or a variable derived therefrom to determine the pressure of the flow in the measuring tube. The current Reynolds number and / or kinematic viscosity of the medium.

Description

technical field [0001] The invention relates to a flow measuring device which works on the basis of the vortex counter principle as described in Flow Handbook, 4th Edition, 2003, ISBN 3-9520220-3-9, p. 103. Background technique [0002] Such flow measurement devices work on the basis of vortices cascading alternately from either side of a barrier around which the fluid flows in a pipe, forming a so-called Karman vortex street, where the vortices generate periodic pressure fluctuations, which utilize the pressure sensors or paddles to record. For a particular measuring device, the frequency of vortex shedding is proportional to the flow velocity and the Strohal number, which is a dimensionless number with a weak dependence on the Reynolds number. The Strohal number can be considered approximately constant for a wide range of Reynolds numbers. Especially for Reynolds numbers below 20,000, however, this no longer holds true, so that the model for determining the flow rate bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/32G01F1/36G01F1/40
CPCG01F1/36G01F1/40G01F1/3209G01F1/3259
Inventor 维韦克·库马尔马克·霍尔马赫
Owner ENDRESS HAUSER FLOWTEC AG