National Primary Special Standard for the Unit of Air Flow Velocity Get 150-2012

Попов, К. В.; Polikarpov, S. A.; Chistyakov, Yu. A.

doi:10.1007/s11018-014-0546-5

Cited by 3 publications

(1 citation statement)

References 1 publication

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“…The measurement of the movement of air had its beginning in the very early days of aircraft development [1]. At present, air velocity measurement has become a very common and important activity within heating ventilation and air-conditioning, safe, comfortable and aerodynamic testing techniques [2], meteorology, aircraft building and flight, mining, precision chemical technology, medicine, ecology for monitoring harmful emissions into the atmosphere [3], dispersion of pollutants [4], and many other areas. The range of air velocities of interest is quite large even in incompressible flow regime, as they span from about 0.05 m/s, typical of natural air convection flows in a controlled room (e.g., clean rooms, the heat transfer in the confined space of a computer, ventilation, or indoor), to almost 50 m/s, typical of high speed winds in open external areas (meteorological or outdoor) [1,4,5].…”

Section: Introductionmentioning

confidence: 99%

A Calibration Facility for Hot-Wire Anemometers in Extremely Low Speed with Air Temperature and Humidity Variable and Controllable

Zhou,

Zhang,

Tian

et al. 2024

Applied Sciences

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Aimed at addressing the difficult problems existing in extremely low speed calibration facilities for hot-wire anemometers, where calibration accuracy is often insufficient and vulnerable to the contamination from temperature and humidity discrepancies between the calibration environment and the application environment, a calibration rig with a velocity range from 0.10 m/s to 1.0 m/s, an air temperature range from ambient temperature to 60 °C, and a humidity range from 20%RH to 80%RH was designed, developed, and constructed. The overall layout arrangement and the mechanical structure of the facility are illustrated. The master control system, the motion control system, the temperature and humidity control system are designed, tested and adjusted. The adjustment results are demonstrated and discussed. The analysis of the results reveals that the maximum velocity control error is 0.000989 m/s, satisfying the design target of 0.003 m/s; the corresponding maximum relative error is 0.241%, which is less than the design target of 0.4%; the maximum temperature control error is 0.9 °C, meeting the design target accuracy of 1 °C; the maximum humidity control error is 2.9%RH, which is below the design target of 4%RH. When the facility is applied to the calibration of a hot-wire anemometer, the maximum error of the fitting curves in modified King’s law is 0.02236 m/s, while that in Van der Hegge Zijnen’s formula is 0.023217 m/s, both of which satisfy the design target accuracy of 0.03 m/s. The maximum relative errors of fitting curves using the two formulas are 5.214% and 8.527%, respectively. Analysis of calibration data reveals that the discrepancy in temperature and humidity between application site and calibration site may bring errors that can reach up to 1.2676% per unit relative humidity discrepancy, and 5.672% per degree Celsius of temperature deviation, respectively.

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Section: Introductionmentioning

confidence: 99%

A Calibration Facility for Hot-Wire Anemometers in Extremely Low Speed with Air Temperature and Humidity Variable and Controllable

Zhou,

Zhang,

Tian

et al. 2024

Applied Sciences

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New air speed calibration system at NMIJ for air speeds up to 90 m/s

Iwai

Funaki

Kurihara

et al. 2019

Flow Measurement and Instrumentation

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Calibration platform controller of the laser Doppler anemometer

Главный

Rakhmanov

Dvoynishnikov

et al. 2021

J. Phys.: Conf. Ser.

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Primary standards for the unit of air flow velocity often use a Laser Doppler Anemometer (LDA) as the primary measurement standard. A rotating disc with a fixed diameter is used to calibrate LDA. The paper proposes calibration platform based on the precision mechanics of HDD disk. A disk rotation controller has been developed for the platform. Deviations of the disk rotation speed do not exceed 0.01% RMS in the range of angular speeds of 600-4800 rpm.

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National Primary Special Standard for the Unit of Air Flow Velocity Get 150-2012

Cited by 3 publications

References 1 publication

A Calibration Facility for Hot-Wire Anemometers in Extremely Low Speed with Air Temperature and Humidity Variable and Controllable

A Calibration Facility for Hot-Wire Anemometers in Extremely Low Speed with Air Temperature and Humidity Variable and Controllable

New air speed calibration system at NMIJ for air speeds up to 90 m/s

Calibration platform controller of the laser Doppler anemometer

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National Primary Special Standard for the Unit of Air Flow Velocity Get 150-2012

Cited by 3 publications

References 1 publication

A Calibration Facility for Hot-Wire Anemometers in Extremely Low Speed with Air Temperature and Humidity Variable and Controllable

A Calibration Facility for Hot-Wire Anemometers in Extremely Low Speed with Air Temperature and Humidity Variable and Controllable

New air speed calibration system at NMIJ for air speeds up to 90 m/s

Calibration platform controller of the laser Doppler anemometer

Contact Info

Product

Resources

About

New air speed calibration system at NMIJ for air speeds up to 90 m/s