摘要
本文对非稳态流场边界条件下的单开口建筑自然通风进行了大涡模拟,采用谐波叠加法生成随机脉动风速时程数据,同时考虑平均风速随高度呈指数分布,脉动风速经过零散度修正处理后作为数值模拟的入口边界条件。比较了不同开口面积,建筑体积以及平均风速对自然通风量的影响。研究结果表明:单开口建筑的自然通风量是风速和建筑开口面积的函数,还与体积相关。如果仍然采用常规稳态通风量模型会错误评估自然通风效果。
Large Eddy Simulation （LES） has been carried out for natural ventilation with single opening building under the unsteady boundary. Random fluctuating wind velocity time series has been generated with harmonic superposition method with consideration of the exponential distribution of the average wind speed along with the height, and then the fluctuating wind speed, after divergence-free modification, is input as the boundary condition for the opening in the numerical simulation. The study compares the impact of natural ventilation rate in different opening area, building volume and average wind speed. It is found that natural ventilation rate for single opening building is not only a function of wind speed and opening area, but also related to volume, steady ventilation model may lead to improper evaluation of natural ventilation effect.
出处
《建筑热能通风空调》
2017年第8期1-4,34,共5页
Building Energy & Environment
基金
湖南省教育厅科学研究项目(17C1381)
衡阳市科学技术发展计划项目(2016KG73)
河南省高等学校供热空调重点学科开放实验室研究基金(2016HAC101)
关键词
非稳态
单开口
自然通风
LES模拟
unsteady flow, single opening, natural ventilation, large eddy simulation
