Wind field observation in transmission line corridors in high altitude regions and the study on turbulence characteristics

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (16) : 9-17.

YANG Fengli1，SHAO Shuai1，ZHANG Hongjie1，SU Zhigang1，FAN Rongquan2

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Abstract

A four-point synchronous fluctuating wind speed measurement system with horizontal pair intervals of 10m, 20m and 30m was established in a plain landform terrain site of Nagqu town, Xizang, at an altitude of 4500m. Continuous records of wind speeds for 1.5 years at this high altitude site were obtained. The maximum average wind speed in 10 minutes and the fluctuating wind speed reached 33.6m/s and 45m/s, respectively. The measured mean values of longitudinal and transverse turbulence intensity are 0.134 and 0.123, respectively, which are between the turbulence intensity of the Exposure Category A and the Exposure Category B specified in DL/T 5551-2018. Based on the synchronous fluctuating wind speed of any two measuring points, the spatial correlation coefficient and turbulent integral scale of the downwind fluctuating wind speed component along the conductor direction were calculated. The generalized extreme value model can better reflect the probability distribution of turbulent integral scale based on high wind speed samples. The higher the field observation sample wind speed, the larger the average turbulence integral scale. When the wind speed sample limit is set as 8m/s and 20m/s, the difference between the average turbulence integral scale is 22.5%. The average turbulence integral scale with high wind speed samples above 20m/s is 106.96m, which is 2.1 times of the 50m specified by DL/T 5551-2018, and the wind load acting on the wires increases by about 6.1%. The wind load on the wires in the high-altitude plain landform may be underestimated.

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high altitude / open terrain / high wind speed / cross-correlation / turbulence integral scale / wind load

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YANG Fengli1, SHAO Shuai1, ZHANG Hongjie1, SU Zhigang1, FAN Rongquan2. Wind field observation in transmission line corridors in high altitude regions and the study on turbulence characteristics[J]. Journal of Vibration and Shock, 2024, 43(16): 9-17

References

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