Research on ultra low dew point in-situ on-line measurement technology for cryogenic wind tunnel

WANG Bin; XU Zhenyu; ZHANG Wenqing; KAN Ruifeng; GAI Wen

doi:10.11729/syltlx20210062

Volume 37 Issue 2

Apr. 2023

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Article Navigation > Journal of Experiments in Fluid Mechanics > 2023 > 37(2): 105-114

WANG B, XU Z N, ZHANG W Q, et al. Research on ultra low dew point in-situ on-line measurement technology for cryogenic wind tunnel[J]. Journal of Experiments in Fluid Mechanics, 2023, 37(2): 105-114 doi: 10.11729/syltlx20210062

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Research on ultra low dew point in-situ on-line measurement technology for cryogenic wind tunnel

doi: 10.11729/syltlx20210062

1.
Facility Design and Instrumentation Institute, China Aerodynamics Research and Development Center, Mianyang　621000, China
2.
Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei　230031, China

Received Date: 2021-06-17
Accepted Date: 2021-09-19
Rev Recd Date: 2021-09-06

Available Online: 2022-06-20

Publish Date: 2023-04-25

Abstract

Abstract

To achieve wide temperature domain, high precision and ultra low dew point in-situ on-line measurement in the cryogenic wind tunnel, a technology based on the laser absorption spectrum is developed. In the method, the principles of laser absorption spectroscopic technology for dew point measurement are analyzed firstly. Then the absorption spectroscopic selection, spectral parameter calibration and spectral signal processing are provided. The experiments are carried out on the low temperature platform and in the 0.3 m cryogenic wind tunnel, which are compared to the chilled-mirror dew-point hygrometer measurement. The experimental results show that the developed technology can achieve wide temperature domain, high precision and in-situ on-line dew point measurement. The measurement range is from –100 ℃ to 30 ℃, the error is less than 1 ℃, and the time is less than 1 s. It can be used for ultra low dew point in-situ on-line measurement in the cryogenic wind tunnel.
- cryogenic wind tunnel,
- dew point,
- laser absorption spectroscopy,
- in-situ on-line measurement

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References(18)

References

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