A comparative analysis of correction method for total-head probes in large velocity-gradient flows

Wysocki, Marian; Drobniak, S.

doi:10.1016/s0167-6105(00)00022-2

Cited by 6 publications

(2 citation statements)

References 4 publications

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“…Actually, the position of the pressure point, especially that of the dynamic pressure varies with Renault number. The total pressure point is not so accurate in industrial application [20]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Numerical Simulation of the Grille-Type Gas Flow Meter in a Short Duct

Zhao

Sun²,

Liu³

et al. 2013

AMR

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Based on Bernoulli law, a average flow meter for short duct is usually designed with a rectifying grille, a series of sectional distributed pressure points and a large pressure-averaging vessel. As rectification is one of the key characteristics of this method, the effect of grille on rectifying is numerically simulated. The predicted results show that the grille in the 800mm×500mm section is very effective on regulating the originally disordered flow in the wind box branch duct. The velocity distribution tends to be uniform when the arrayed pitch is decreased while the rectifying effect is not closely associated with the relative location of the grille. The grille thickness plays a determining role as the rectifying becomes gradually weakened when the thickness is over 200mm. When a 5×4 grille with a thickness of 200mm is mounted at 200mm from the main duct outlet horizontally in downstream duct of the main wind box, the averaged pressure of each subsection is in good linear relation with the average gas velocity in the branch duct. The linear relationship is well maintained when the static pressure is measured at specific position and the dynamic pressure point is installed with error of 4o. This indicates that the grille-type flow meter is very reliable on measuring average gas velocity in short ducts. The application of this method on a 200MW industrial boiler shows that it possess promising potentials on optimizing combustion and emission, which could bring admirable environmental, economic and social benefits.

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Section: Resultsmentioning

confidence: 99%

Numerical Simulation of the Grille-Type Gas Flow Meter in a Short Duct

Zhao

Sun²,

Liu³

et al. 2013

AMR

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show abstract

“…Bouhy summarized the evolution process and the required working conditions of Pitot tube, and put forward the onsite correction factor to diminish the error due to improper installations [2]. Wysocki et al presented the optimal mounting location of a Pitot tube by comparing the measurement accuracy of Pitot tubes placed at different distances from an elbow, a valve or an obstacle [3]. Gao analyzed the influencing factors on Pitot tube measurement such as the fluid density, pressure loss, flow field variation, temperature, humidity etc [4].…”

Section: Introductionmentioning

confidence: 99%

Influence of improper installation on measurement performance of Pitot tube

Sun

Zheng

2009

2009 International Conference on Industrial Mechatronics and Automation

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Pitot tube is widely used for fluid velocity and flow rate measurement in industrial fields. However, improper installation of the Pitot tube is actually inevitable, which causes additional errors to the measurement. In this paper, through exploring the relationship between the pressure sensing tube and the fluid flowing direction, a correlation was deduced for calculating the theoretical flow rate of the Pitot tube under improper installations, and the influence of different deflection angles on Pitot tube measurement performance was discussed. Based on the experiments carried out in a DN200 air horn, the theoretical flow rates were compared with the measured. The methodology of correcting the flow rate of a Pitot tube by the correction factor was put forward, and the correction factors of different mounting deflection angles were calibrated. The results show that the correction factor is basically symmetrical with the horizontal deflection angle, whereas it decreases first and increases afterwards when the vertical deflection angle varies from -30º to 30º. By adopting the correction factor, the flow measurement accuracy of the Pitot tube under improper installations can be improved significantly.

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Overview on Performance-Based Engineering Under Multihazard Environments

Huang

2016

High-Rise Buildings Under Multi-Hazard Environment

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A comparative analysis of correction method for total-head probes in large velocity-gradient flows

Cited by 6 publications

References 4 publications

Numerical Simulation of the Grille-Type Gas Flow Meter in a Short Duct

Numerical Simulation of the Grille-Type Gas Flow Meter in a Short Duct

Influence of improper installation on measurement performance of Pitot tube

Overview on Performance-Based Engineering Under Multihazard Environments

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