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MVD measurement method for complex icing cloud mist in large-scale icing wind tunnel

A measurement method and wind tunnel technology, applied in the measurement device, the test of machine/structural components, the moisture content of materials, etc., can solve the problems of long test cycle, reduced experimental efficiency, and complicated experimental installation, so as to shorten the test cycle and improve the The effect of experiment efficiency and convenient experiment process

Active Publication Date: 2022-01-07
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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  • Application Information

AI Technical Summary

Problems solved by technology

Although these instruments can measure the size parameters of icing cloud and fog droplets, there are problems such as complicated experimental installation, long test cycle, and complex data processing in the later stage, which significantly increases the cloud and fog calibration cycle of the icing wind tunnel and reduces the experimental efficiency.

Method used

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  • MVD measurement method for complex icing cloud mist in large-scale icing wind tunnel
  • MVD measurement method for complex icing cloud mist in large-scale icing wind tunnel
  • MVD measurement method for complex icing cloud mist in large-scale icing wind tunnel

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Embodiment Construction

[0041] The following description provides many different embodiments, or examples, for implementing various features of the invention. The elements and arrangements described in the following specific examples are only used to express the present invention in a concise manner, and are only used as examples rather than limiting the present invention.

[0042] A multi-hot wire water content measuring instrument is set in the icing wind tunnel, and the multi-hot wire water content measuring instrument 1 includes a first hot wire unit 11, a second hot wire unit 12, a third hot wire unit 13 and a fourth hot wire unit 14; The first heating line unit 11 is a semicircular tubular structure, the inner surface of the semicircular tubular structure is facing the airflow, and its span is perpendicular to the direction of the airflow. This semicircular tubular structure is conducive to the collection and measurement of ice crystal particles, and is suitable for In the measurement of the to...

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Abstract

The invention is suitable for the field of icing wind tunnel icing cloud calculation, and provides a MVD measurement method for complex icing cloud mist in a large-scale icing wind tunnel. A function relationship between a hot line unit droplet evaporation ratio and MVD is obtained through experiment and calibration under typical working conditions, and subsequent MVD calculation is carried out by using the relationship. According to the method, the liquid water content is measured by adopting the multi-hot-wire unit, the droplet evaporation ratio of the hot-wire unit is calculated based on the liquid water content, and the MVD value is calculated by utilizing the relationship between the droplet evaporation ratio of the hot-wire unit and the MVD. According to the method, the volume median diameter of the liquid drop in the icing cloud can be quickly and efficiently calculated, and the icing wind tunnel cloud measurement test efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of icing cloud and fog calculations in icing wind tunnels, in particular to a complex icing cloud MVD measurement method in a large icing wind tunnel. Background technique [0002] When an aircraft is flying in clouds, supercooled water droplets (ie, liquid water droplets whose temperature is below freezing point) in the clouds will continuously hit the windward side of the aircraft, causing the surface to freeze. Aircraft icing widely exists in flight practice and seriously threatens flight safety. [0003] The icing wind tunnel is an important ground test equipment for aircraft icing research and aircraft component anti-icing system verification, and it plays an important role in aircraft icing airworthiness certification. The ability to simulate the icing cloud and fog environment is the core content of the performance of the icing wind tunnel. Accurate measurement and evaluation of the microphysical characterist...

Claims

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Application Information

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IPC IPC(8): G01N15/02G01N25/56G01M9/06B64F5/60
CPCG01N15/02G01N25/56G01M9/06B64F5/60G01N2015/0277
Inventor 郭向东张平涛赵献礼李明易贤
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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