单叶片流动阻力特性数值模拟与实验研究  

Simulation and Experimental Study of Airflow Resistance Characteristics Around a Single Tree Leaf

作　　者：胡文娟[1] 付海明[1] 

机构地区：[1]东华大学环境科学与工程学院

出　　处：《建筑热能通风空调》2016年第9期42-46,共5页Building Energy & Environment

基　　金：国家自然科学基金(No.41371445)

摘　　要：本文主要针对风速、叶面积和叶位角进行分析,通过建立单叶片模型,利用CFD软件求解N-S方程,得出了风速、叶面积和叶位角对单叶片压力损失和速度分布规律。结果表明:气流经过单片树叶产生的压力损失随着风速的增加呈非线性增加,叶位角越大,有效叶面积越大,压力损失越大。根据大量的模拟数据,采用多元回归的方法得出各影响因素与单片树叶压力损失的关联计算式,并用风洞实验进行验证。在引入修正系数k后,模拟所得关联计算式与风洞实验结果基本吻合。This paper mainly provides analysis of the relationship between single leaf pressure drop and leaf area, leaf position angle and wind speed. The pressure drop and velocity distribution of wind flow around the leaf were achieved by solving the N-S equation with CFD software. Study has shown that the pressure drop presented nonlinear increase with the increase of wind speed and the lager the leaf position angle is, the higher effective leaf areas increase. A semi-analysis expression for predicting pressure drop of wind flow across a leaf was obtained by regression analysis basing on the simulation data and it was validated by wind tunnel experiment. The results obtained by simulation showed good agreement with the experimental data after modifying the simulation results with a correction factor k.

关 键 词：单片树叶 CFD数值模拟 压力损失 风洞实验 

分 类 号：O355[理学—流体力学]