基于自回归线性过滤法的湍流风场大涡模拟研究  

Large-Eddy Simulation of Wind Field Based on Autoregressive Linear Filtering Method

作　　者：郭涛 李晔 李德顺[1,2] 臧志昭 胡渊 GUO Tao;LI Ye;LI De-shun;ZANG Zhi-zhao;HU Yuan(School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Gansu Provincial Technology Centre for Wind Turbines,Lanzhou 730050,China)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]甘肃省风力机工程技术研究中心,甘肃兰州730050

出　　处：《液压气动与密封》2023年第5期103-106,113,共5页Hydraulics Pneumatics & Seals

基　　金：国家自然科学基金(52166014);甘肃省科技创新项目(21JR7RA277);甘肃省教育厅项目(2021CXZX-473)。

摘　　要：基于大涡模拟入口方法中的AR线性过滤法,以Kaimal谱为目标谱,采用指数率风速廓线分布规律,以此编写AR法程序,生成计算域入口不同位置处的随机数据序列。为生成符合B类风场规范的湍流场,在0~150 m和150~500 m的高度段,把AR法生成的数据序列扩大不同的倍数,与平均风速剖面叠加,添加到计算域入口,生成湍流风场,对比不同随机数放大倍数下的平均风速剖面和湍流度剖面的变化规律,当0~150 m高度区间的数据序列扩大1.3倍,150~500 m高度区间的数据序列扩大2.3倍时,生成的湍流场基本可以满足B类风场规范要求。Based on the Kaimal spectrum and exponential rate wind profile distribution law,the AR method(autoregressive linear filtering method)is used to generate original random data sequences at different positions of the computational domain entrance.The original random data sequence is given to computational domain entrance as inflow condition of LES by adding with average velocity wind profile.Results show that the generated turbulent flow field cannot meet the specifications of the B wind farm.In order to generate a turbulent flow field that meet the B Class wind farm,the value of the original data sequence is increased to different times.In the study,the original data sequences with the height of the entrance less than 150 m and 150~500 m are separately increased to different times.The influence of the times on the characteristics of the turbulent wind farm is studied.It is found that multiple has little effect on wind profile,and has a great influence on turbulence profile.When the multiples are 2.5 and 1.5,the generated turbulent flow field meet the specifications of the B wind farm.

关 键 词：大涡模拟 自回归线性过滤法 Kaimal谱 湍流风场 

分 类 号：TH138[机械工程—机械制造及自动化] TH312