Preliminary research on size measurement of supercooled large droplet in icing wind tunnel

CHEN Shuyue; GUO Xiangdong; WANG Zixu; LIU senyun; WU Yingchun

doi:10.11729/syltlx20200104

Volume 35 Issue 3

Jun. 2021

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Journal of Experiments in Fluid Mechanics > 2021 > 35(3): 22-29. > DOI: 10.11729/syltlx20200104

CHEN Shuyue, GUO Xiangdong, WANG Zixu, LIU senyun, WU Yingchun. Preliminary research on size measurement of supercooled large droplet in icing wind tunnel[J]. Journal of Experiments in Fluid Mechanics, 2021, 35(3): 22-29. DOI: 10.11729/syltlx20200104

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Preliminary research on size measurement of supercooled large droplet in icing wind tunnel

1.
Key Laboratory of Icing and Anti/De-icing, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China
2.
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou Zhejiang 310027, China

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Received Date: September 02, 2020
Revised Date: October 12, 2020

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Abstract

Drop-size measurement of the supercooled large droplet (SLD) is very important for capacity building of the icing wind tunnel. In order to evaluate the capability of Phase Doppler Interferometer Flight Probe Dual Range (PDI-FPDR) in measuring the diameter of SLD, the standard droplet stream generated by a droplet generator, was used to evaluate the uncertainty of PDI-FPDR for drop size measurement. Then, for the real large-droplet spray, the particle size characteristic parameters were measured by Malvern and PDI-FPDR simultaneously. The large-droplet spray measurement capability of PDI-FPDR has been further evaluated. The results show that the small size range channel of PDI-FPDR can't accurately measure large droplets, and its measurement results are much smaller than the real droplet size. The relative error of measuring a 189.0 μm droplet is -72.8%. The measuring accuracy of the large size range channel is high, but the precision is poor. The relative error of measuring a 240.5 μm droplet is -5.1%, and the maximum deviation is 50.2 μm. For typical large-droplet spray, the PDI-FPDR small size range channel has poor applicability under measuring conditions of median volume diameter (MVD) greater than 75.0 μm. The measured MVD values of PDI-FPDR large size range channel are larger than those of Malvern.
- icing wind tunnel,
- supercooled large droplet,
- droplet size,
- droplet flow,
- spray

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