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The electrothermal anti⁃icing and deicing system is often used to ensure flight safety and aerodynamic performance when aircraft encounters icing conditions. This paper establishes a coupled calculation model of multi-layer heat conduction and water film flow by using the conjugate coupling method, and develops a series of numerical simulation calculations for the electrothermal anti-icing and deicing process. Myers water film model is able to stimulate non-stationary calculations, while the internal thermal conductivity model of the electrothermal component is implicitly discretized by using the finite volume method. The water film model and thermal conductivity model are loosely coupled through the conjugate heat transfer method by ex⁃ changing boundary values. Research has found that during the process of electrothermal anti-icing, the phenomenon of runback water refreezing occurs due to the melting of ice accumulation and the flow of water film. A flow field calculation and aerodynamic analysis are conducted on the icing shape of the electrothermal system in the later stage. It shows that the frozen overflow water on the upper and lower wing surfaces of the wing will cause disturbance to the flow field. The Q-criterion is used to determine the vortex structure behind the icing. Compared with clean airfoils without icing, the freezing of runback water at the leading edge of the wing causes significant oscillations in the pressure coefficient curve. Therefore, the problem of refreezing run⁃ back water affects the aerodynamic performance of the wing, which leads to the undesired protective effect of the electrothermal system. [ABSTRACT FROM AUTHOR]

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Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Preventive Veterinary Medicine / Zhongguo Yufang Shouyi Xuebao is the property of Chinese Journal of Preventive Veterinary Medicine Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Preventive Veterinary Medicine / Zhongguo Yufang Shouyi Xuebao is the property of Chinese Journal of Preventive Veterinary Medicine Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The medium volume diameter (MVD) of droplet is one of the most basic and important parameters of an icing wind tunnel, and the accuracy of MVD measurement affects the study of icing performance of aircrafts. This paper presented a simple method for measuring water droplet diameter by laser particle size analyzer, which can be applied in small icing wind tunnels. The calibration of MVD is carried out based on rotating multi-cylinder method. According to the icing accumulation of rotating multi-cylinders, the rime ice accumulation on a two-dimension rotating cylinder is numerically simulated. In combination with successive approximation method, the software for the parameter analysis of rotating multi-cylinder measurements is programmed. Calibration results agree well with the measurements. The results indicate that the calibration method is effective for the rapid measurement of the MVD. [ABSTRACT FROM AUTHOR]