Next Article in Journal
Bacillus subtilis Simultaneously Detoxified Aflatoxin B1 and Zearalenone
Previous Article in Journal
The Effects of an Ethics Education Program on Artificial Intelligence among Middle School Students: Analysis of Perception and Attitude Changes
 
 
Font Type:
Arial Georgia Verdana
Font Size:
Aa Aa Aa
Line Spacing:
Column Width:
Background:
Article

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

1
Facility Design and Instrumentation Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China
2
Department of Aircraft Aerodynamics, School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China
3
School of Astronautics, Northwestern Polytechnical University, Xi’an 710072, China
4
School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2024, 14(4), 1587; https://doi.org/10.3390/app14041587
Submission received: 9 January 2024 / Revised: 10 February 2024 / Accepted: 12 February 2024 / Published: 16 February 2024
(This article belongs to the Section Fluid Science and Technology)

Abstract

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 of 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.
Keywords: extremely low speed; calibration facility; velocity control; temperature control; humidity control; calibration of hot-wire anemometers extremely low speed; calibration facility; velocity control; temperature control; humidity control; calibration of hot-wire anemometers

Correction Statement

This article has been republished with a minor correction to resolve spelling and grammatical errors. This change does not affect the scientific content of the article.

Share and Cite

MDPI and ACS Style

Zhou, T.; Zhang, Z.; Tian, Y.; Xi, Z.; Dou, X.; Liu, W.; Zhang, G.; Gao, C. A Calibration Facility for Hot-Wire Anemometers in Extremely Low Speed with Air Temperature and Humidity Variable and Controllable. Appl. Sci. 2024, 14, 1587. https://doi.org/10.3390/app14041587

AMA Style

Zhou T, Zhang Z, Tian Y, Xi Z, Dou X, Liu W, Zhang G, Gao C. A Calibration Facility for Hot-Wire Anemometers in Extremely Low Speed with Air Temperature and Humidity Variable and Controllable. Applied Sciences. 2024; 14(4):1587. https://doi.org/10.3390/app14041587

Chicago/Turabian Style

Zhou, Tingbo, Zhengke Zhang, Yongqiang Tian, Zhongxiang Xi, Xiaomu Dou, Weidong Liu, Guobiao Zhang, and Chao Gao. 2024. "A Calibration Facility for Hot-Wire Anemometers in Extremely Low Speed with Air Temperature and Humidity Variable and Controllable" Applied Sciences 14, no. 4: 1587. https://doi.org/10.3390/app14041587

APA Style

Zhou, T., Zhang, Z., Tian, Y., Xi, Z., Dou, X., Liu, W., Zhang, G., & Gao, C. (2024). A Calibration Facility for Hot-Wire Anemometers in Extremely Low Speed with Air Temperature and Humidity Variable and Controllable. Applied Sciences, 14(4), 1587. https://doi.org/10.3390/app14041587

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

Article Metrics

Back to TopTop