Based on the discharge theories of long air gap,a leader propagation model on lightning shielding failure is presented in this paper.
为评估、计算输电线路雷电屏蔽性能即绕击性能,基于长空气间隙放电理论建立了特高压直流输电线路雷电屏蔽的先导发展模型,并用该模型计算了拟建立的云广±800 kV直流特高压输电线路雷电屏蔽性能。
Considering the randomness of leader propagation,a lightning stroke simulation model on lightning shielding performance of transmission line was presented,in which the simulation charge method was applied.
为准确评价线路的绕击耐雷性能,考虑先导发展随机性,运用模拟电荷法,建立了输电线路雷屏蔽性能的雷击仿真模型。
This paper investigate the development, the breakdown process, and the discharge path selection of the lightning leader while there exsit corona iorns in the space.
为探明当空气中含有电晕产生的离子时(离子背景),对雷电先导的发展、击穿过程和路径的选择有何影响,分别采用两种不同的实验方法研究了正、负离子流对先导放电进展路径影响的特点及规律,两种方法得出的一致结果表明,有离子背景的雷电先导放电路径具有选择负离子背景而回避正离子背景的特点和规律并运用电子崩发展和电场作用两方面原理,分析了离子背景的影响机制。
In the past 30 years,every innovation of theory and practice would start from mind emancipating,which is the forerunner of reform and opening.
30年来,改革开放的每一个重大的实践活动和理论创新,都是由思想解放开始的,思想解放是改革开放实践的先导。
Among the join forces of social development, philosophy work like a cock diligent in heralding the dawn to act as the guide and impetus of ideological liberation, innovation of thinking mode, the comprehensive development of a person, the development of spiritual civilization, theoretical creativity of Marxism and social modification.
在社会发展的“合力”中 ,哲学既好似勤于报晓的“雄鸡”,是思想解放、思维方式变革、人的全面发展、精神文明进步、马克思主义理论创新、社会变革的先导和动力 ,又像是善于反思的“猫头鹰”,揭示社会发展的规律 ,把握时代主题的转换 ,指明历史前进的方向。
The control concepts and configuration characteristic are detailed,as well the experiment principle and process of the pilot valves are introduced.
阐述了电液先导控制阀组的控制原理和结构特点,介绍了先导阀组的试验原理和步骤。
Results and dynamic characteristics of pilot test of surfactant/polymer binary combination flooding in western No. 7 district in Gudong Oilfield;
孤东油田七区西南二元复合驱油先导试验效果及动态特点
Composite sand control pilot test in Shu 3 area;
曙三区综合防砂先导试验研究
Optimization of succeeding water flooding plan after steam drive pilot test in Block Qi40;
齐40块蒸汽驱先导试验后续水驱方式优选
Numerical simulation and experiment of thrust characteristic on electromagnet of pilot valve;
先导阀电磁铁的吸力特性数值模拟与试验
Flow and force on the high water based electromagnetic pilot valve in the hydraulic support system is simulated based on standard k-ε turbulent model.
在FLUENT软件平台上,采用标准k-ε紊流模型模拟了液压支架系统中高水基电磁先导阀流道内阀芯所受轴向阻力的情况。
Apply fluent software of computational fluid dynamics,simulate the flow field of electromagnetic pilot valve,gain the velocity and pressure distribution of the fluid states.
利用Fluent软件对流经先导阀阀芯的流场进行模拟,得到阀芯内的速度分布和压力分布,并发现有比较严重的回流现象,增大出口压力或出口速度均减小回流的影响。