首页|建筑物顶端几何特征对上行先导起始影响的3D模拟

建筑物顶端几何特征对上行先导起始影响的3D模拟

扫码查看
原文链接
  • 万方数据
  • 维普
建筑物几何特征对上行先导始发具有重要影响,基于三维变网格雷击物理模型,在不同几何特征建筑物和不同雷电流峰值情况下,探讨了下行负地闪过程中,建筑物顶部上行正先导始发影响因素.除了发现建筑物高度对先导的始发具有促进作用外,还得到以下结论:①雷电流峰值Ip相同时,建筑物的高度越高,其几何形状对上行稳定先导起始的影响(η)就越小.建筑物高度相同时,雷电流峰值越大,η越小;②圆柱塔形尖端的上行稳定先导最容易起始,且最接近针形,η最小,为12.2％.长方体形上的稳定先导起始最晚,η最大,可达53.4％;③对于高度较矮和雷电流峰值较小的情况下,尖端几何形状(塔形或斜坡)对先导起始的影响较明显.
3D Simulation Research on the Effect of Geometric Characteristics of Building Tip on the Initiation of Upward Leader
The geometric characteristics of the building have an important effect on the initiation of the upward leader.Based on a three-dimensional variable grid physical lightning model,in the case of buildings with different geometric characteristics and the peak current(Ip)of the lightning strike,the influence factors of upward positive leader initiation at the tip of buildings during the development of downward negative cloud-to-ground flash is discussed.In addition to finding that,the height of the building has a promoting effect on the initiation of the leader.The following conclusions have obtained.For the same Ip,the taller the building,the smaller the difference(η)of its geometric on the leader initiation;for the buildings of the same height,as Ip increases,the η becomes smaller.The stable leader at the tip of the cylindrical tower type is the easiest to initiate and the closest to the needle,the smallest η have reached at 12.2％.The stable leader at tip of the cuboid type is the latest to initiates,the largest 77 have reached at 53.4％.For the case of short building and weaker Ip,the geometric characteristics of tip(tower or slope)has a significant effect on the leader initiation.

tall buildingupward leadergeometry of buildingpeak current of the lightning strike

郭秀峰、高玥、章玲、赵念、汪兆霞、黄可洋

展开 >

南京信息工程大学电子与信息工程学院,南京 210044

中国气象科学研究院灾害天气国家重点实验室,北京 100081

无锡学院大气与遥感学院,无锡 214105

高建筑物 上行先导 几何形状 雷电流峰值

国家自然科学基金江苏省基础研究计划(自然科学基金)青年基金江苏省高等学校自然科学研究面上项目江苏省高等学校自然科学研究面上项目灾害天气国家重点实验室开放基金山东自然科学青年基金(2021)江苏省科协青年科技人才托举工程项目江苏省高等学校"青蓝工程"优秀青年骨干教师培养项目

42205078BK2019014721KJB17000722KJB1700212021LASW-B04ZR2021QD023

2024

10.12404/j.issn.1671-1815.2304902

科学技术与工程
中国技术经济学会

科学技术与工程

CSTPCD北大核心
影响因子：0.338
ISSN：1671-1815
年,卷(期)：2024.24(15)
  • 25