Engineering Calculation Method for Horizontal Wind Profiles of Downburst

doi:10.3969/j.issn.1000-7229.2014.01.008

Abstract

Abstract:

Downburst is a kind of strong wind that results from the flow downdraft nearby ground in thunderstorm. In order to make the application of downburst wind profiles convenient in engineering design, taking the vertical dash of downburst on horizontal ground as an example, this paper summarized the calculation process of horizontal wind profiles of downburst with using international dimension, and simulated the true scale wind field of downburst with using CFD, Then, different empirical formulas were compared and selected to obtain the engineering calculation method of wind profile. Finally, downburst wind profiles at different radial position were calculated by the chosen emprical formula, as well as the influencing height and radial scale of downburst were analyzed based on the downburst distribution at atmosphere boundary layer, which has shown that the maximum influencial height of downburst is near the position of its maximum wind speed.

Key words: downburst, horizontal wind profile, engineering calculation method, international dimension, emprical formula

DANG Huixue, ZHANG Lu, YANG Fengli, YANG Jingbo, LI Jie. Engineering Calculation Method for Horizontal Wind Profiles of Downburst[J]. ELECTRIC POWER CONSTRUCTION, 2014, 35(1): 40-45.

References

［1］屈讼昭. 国内外输电塔风荷载技术标准比较分析［J］.电力建设, 2013, 34（5）:22-29.

［2］廖宗高,张华,陈海波. 特高压输电线路设计风速取值的探讨［J］.电力建设, 2006, 27（4）:28-32.

［3］谢强，张勇，李杰. 华东电网500 kV任上5237线飑线风致倒塔事故调查分析［J］. 电网技术, 2006, 30（10）: 59-63.

［4］ Vickery P J, Twisdale L A. Analysis of Thunderstorm Occurrences and Wind Speed Statistics［J］. Journal of Wind Engineering and Applied Aerodynamics, 1995（55）: 813-821.

［5］ Selvam R P, Holmes J D. Numerical Simulation of Thunderstorm Downdrafts［J］. Journal of Wind Engineering and Applied Aerodynamics, 1992（41-44）: 2817-2825.

［6］ Anindya S, Partha P S. Experimental Measurement and Numerical Simulation of an Impinging Jet with Application to Thunderstorm Microburst Winds［J］. Journal of Wind Engineering and Industrial Aerodynamics, 2008（96）: 345-365.

［7］ Brian C V, Leigh G O, Eric S. Improved Modeling of Downburst Outflows for Wind Engineering［J］. Journal of Wind Engineering and Industrial Aerodynamics, 2011（99）:801-814.

［8］ Jongdae K, Horia H. Numerical Simulation of Impinging Jets with Application to Downbursts［J］. Journal of Wind Engineering and Industrial Aerodynamics, 2007 （95）:279-298.

［9］ Chay M, Albermani F, Wilson R. Numerical and Analytical Simulation of Downburst Wind Loads［J］. Journal of Wind Engineering and Industrial Aerodynamics, 2006 （28）:240-254.

［10］ Chao Li, Li Q S, Xiao Y Q, et al. A Revised Empirical Model and CFD Simulations for 3D Axisymmetric Steady-state Flows of Downbursts and Impinging Jets［J］. Journal of Wind Engineering and Industrial Aerodynamics, 2012 （102）:48-60.

［11］ Yan Z, Partha P S, Hui H. Experimental and Numerical Investigation on the Flow Characteristics of Microdownburst-like Winds［C］. AIAA 2012-1197.

［12］ Oseguera R, Bowles R. A Simple Analytic 3-Dimensional Downburst Model based on Boundary Layer Stagnation Flow［R］. NASA Technical Memorandum, 100632.

［13］ Vicroy D. A Simple Analytical Axisymmetric Microburst Model for Downdraft Estimation［R］. NASA Technical Memorandum, 104053.

［14］ Graeme S W, Kenny C S K. Physical and Numerical Modeling of Thunderstorm Downbursts［J］. Journal of Wind Engineering and Industrial Aerodynamics, 2001（89）:535-552.

［15］ Vicroy D. Assessment of Microburst Models for Downdraft Etimation［J］. Journal of Aircraft, 1992,29（6）: 1043-1048.