Research to the influence factors on shedding processes of three-types icing

Zhou, Yue; Niu, Shengjie; Gao, Zhengxu; Zhou, Yuehua; Yang, Jialun

doi:10.1016/j.coldregions.2018.08.024

Cited by 7 publications

(3 citation statements)

References 32 publications

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“…Ice shedding includes three mechanisms; melting, sublimation, and mechanical breaking [13], and it usually occurs at the end of the icing period under changed weather conditions. The phenomenon in which ice was shed temporarily during a growth period and then grew again was observed in cases 2 and 4 (arrows in Figure 3b,d).…”

Section: Impermanent Ice Shedding Phenomenon In Freezing Rain and Supercooled Fogmentioning

confidence: 99%

Observation and Simulation Studies of Three Types of Wire Icing

Niu

Zhou³

et al. 2019

Atmosphere

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Research on three types of wire icing evolution mechanism is of great significance for ice disaster recognition and prediction. Comprehensive field observations of wire icing were conducted in the winters of 2015/2016 and 2016/2017 at the Lushan Mountain Meteorological Bureau Observatory (elevation 1164.5 m), Jiangxi Province, China, and the ice thickness, weather phenomena, meteorological elements, and fog spectrum were measured. Four icing cases were recorded, in which high ice-producing conditions, such as freezing rain, snow and supercooled fog, occurred. The icing growth and shedding mechanisms in three types of weather (freezing rain, snow, and supercooled fog) were analyzed and compared. Considering mixed ice-producing conditions, the ice thickness was simulated by integrating freezing rain, snow, and supercooled fog icing models, with inputs such as the precipitation rate and wind speed. The average measured icing growth rates in freezing rain, snow, and supercooled fog were 0.4, 0.3, and 0.2 mm h−1, respectively. The correlations between the icing growth rate and both the temperature and the wind speed were stronger in the snow and supercooled fog than in freezing rain. With the decreasing temperature, the icing growth rate increased faster with snow, while that in supercooled fog increased faster as the wind speed increased. In freezing rain, snow, and supercooled fog, the icing growth rates were all positively correlated with the ice thickness, with correlation coefficients of 0.55, 0.67, and 0.79, respectively. Ice was shed when the temperature remained below 0 °C, the wind speed fell to 2.7 m s−1, and the fog liquid water content fell to 0.036 g m−3 in supercooled fog, and when the solar radiation increased and the temperature exceeded 0 °C in freezing rain. The average sticking efficiency of the wire to snow was 0.03; its variation range was 0.01–0.10. The integrated model can simulate the changes in actual ice thickness well.

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Section: Impermanent Ice Shedding Phenomenon In Freezing Rain and Supercooled Fogmentioning

confidence: 99%

Observation and Simulation Studies of Three Types of Wire Icing

Niu

Zhou³

et al. 2019

Atmosphere

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“…The distribution of the above four sites is shown in Figure 1. The four stations are located in the intermediate and high-altitude mountainous areas in the southwest, southeast, and west of Hubei Province, which basically cover the three main heavy ice areas in Hubei Province (Zhou et al, 2013(Zhou et al, , 2018; the southwest and southeast areas have Gezhouba Power Plant, Three Gorges Power Station Transmission Project and Westto-East Power Transmission Project, representing the ice accretion process in mountainous areas under the joint action of cold front system and southwest warm-humid airflow. The Shennongjia in the west is a typical representative of ice accretion in high-altitude mountains.…”

Section: Methodsmentioning

confidence: 99%

Influence of key parameters of ice accretion model under coexisting rain and fog weather

Zhou

Wu²,

Sun³

et al. 2023

Front. Earth Sci.

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Based on 30 complete wire icing processes lasted longer than 24 h observed from the Enshi, Jinsha, Dacaoping and Shennongding of Shennongjia in mountainous areas of Hubei province during the winter of 2008–2016, the macroscopic effects of rain–fog weather on the ice accretion process were analyzed. Furthermore, the distribution characteristics of key simulation parameters in supercooled fog (SF) and freezing rain (FR) were discussed according to the physical model of icing process. Finally, the evolution characteristics of the simulated ice thickness in rain–fog weather were proposed. Results showed that the duration of ice accretion in mountainous areas is the key factor affecting the maximum ice thickness; the freezing rain is most frequent during the glaze icing process, which leads to the substantial growth of ice thickness. The average growth rates of ice thickness with and without freezing rain are 1.26 mm h−1 and -0.11 mm h−1, respectively. Collision rate is the main parameter for inhibiting ice accretion of SF, with an average value of ∼ 0.1, while freezing rate is the main parameter for inhibiting ice accretion of FR, with an average value of ∼ 0.6. The ice accretion of SF shows the characteristics of periodic growth, while the ice accretion of FR shows the explosive growth of ice thickness, which makes the simulated values of icing closer to the observations. The ice formation efficiency of FR was more than twice that of SF, with a negative feedback mechanism to the ice accumulation of SF.

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“…The excess weight leads to an off-design loading, violation of strength conditions, and, finally, ruptures of power transmission line wires or destruction of contact supports. [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Icing waveguide strength problem

Brungardt

Kudryavtsev

Brungardt

et al. 2022

J. Phys.: Conf. Ser.

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In this paper, we conduct research of the waveguide strength under icing. Icing is assumed to be uniform along the perimeter and length of the waveguide, so ice deposits is considered in the form of an equivalent increase in the density of the structure. As a result, the icing problem is reduced to the problem of gravitational bending of the waveguide. Waveguide has a thin-walled rectangular cross-section; therefore, a solution demand using the theory of plate. We model the waveguide in the form of 4 plates that made it possible to obtain an analytical solution to the problem according to the plate theory. Also, it makes possible to identify the features of the stress distribution both in length and in the height of cross-section of the waveguide and refine the results in comparison with the theory of beams. The results of analytical calculation according to the developed method is compared with the data obtained according to beam theory, which show good convergence with the data obtained according to beam theory, which showed good convergence.

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Research to the influence factors on shedding processes of three-types icing

Cited by 7 publications

References 32 publications

Observation and Simulation Studies of Three Types of Wire Icing

Observation and Simulation Studies of Three Types of Wire Icing

Influence of key parameters of ice accretion model under coexisting rain and fog weather

Icing waveguide strength problem

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