基于稀疏增强动力学模态分解的风力机尾流模型研究  

STUDY ON WAKE MODEL OF WIND TURBINE BASED ON SPARSITY PROMOTING DYNAMIC MODE DECOMPOSITION

作　　者：张虎 许昌[1] 魏赏赏 霍志红[1] 韩星星[1] 薛飞飞[1] Zhang Hu;Xu Chang;Wei Shangshang;Huo Zhihong;Han Xingxing;Xue Feifei(College of Energy and Electricity Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学能源与电气学院,南京211100

出　　处：《太阳能学报》2024年第7期681-690,共10页Acta Energiae Solaris Sinica

基　　金：中央高校基本科研业务费专项资金(B210201018);江苏省政策引导类计划(国际科技合作/港澳台科技合作)(BZ2021019);国家自然科学基金(52106238)。

摘　　要：基于稀疏增强动力学模态分解(SPDMD)方法对风力机尾流大涡模拟(LES)结果开展降阶模型研究,并将分解结果与标准DMD方法进行比较。结果表明,动力学模态分解方法能提取尾流动态特征,揭示风力机尾流演化规律。标准DMD方法倾向于选择具有小尺度和高频率的模态,而SPDMD方法选择具有低频率的大尺度流动特征。相比于标准DMD方法,SPDMD方法在低维子空间上建立风力机非定常尾流场的降阶模型,以较少的模态数目重构和预测风力机尾流场,可提高计算效率。This study investigates the reduced-order model of wind turbine wakes based on the sparsity promoting dynamic mode decomposition(SPDMD)method using large eddy simulation(LES)results.A comparison is made between the decomposition outcomes obtained from SPDMD and the standard DMD method.The findings demonstrate that the dynamic mode decomposition approach can extract the dynamic characteristics of wake flow,thereby revealing the underlying evolution patterns of wind turbine wakes.The standard DMD method tends to prioritize modes with small scales and high frequencies,whereas the SPDMD method selects large-scale flow features with low frequencies.In comparison to the standard DMD method,the SPDMD approach constructs a reduced-order model of wind turbine unsteady wake fields in a lower-dimensional subspace.By utilizing a smaller number of modes,the SPDMD method improves computational efficiency in the reconstruction and prediction of wind turbine wake fields.

关 键 词：风力机 尾流 动力学模态分解 降阶模型 

分 类 号：TK89[动力工程及工程热物理—流体机械及工程]