CAJ | 학술논문

采用非线性动力学理论对翼型绕流的多模态耦合机制进行研究，并阐释模态耦合作用与流动稳定性的关系。通过特征线有限元方法对翼型绕流问题进行数值计算，建立非定常流场数据库。为了分析流动稳定性和流动特征，利用本征正交分解提取流场中的特征模态，从而分析翼型绕流非定常流场的特征模态之间的相互作用关系，并给出了非线性流体动力系统中的不同模态作用与流动稳定性的关系。
채용비선성동역학이론대익형요류적다모태우합궤제진행연구，병천석모태우합작용여류동은정성적관계。통과특정선유한원방법대익형요류문제진행수치계산，건립비정상류장수거고。위료분석류동은정성화류동특정，이용본정정교분해제취류장중적특정모태，종이분석익형요류비정상류장적특정모태지간적상호작용관계，병급출료비선성류체동력계통중적불동모태작용여류동은정성적관계。
Multi?mode interaction mechanism of flow around an airfoil is presented from viewpoint of nonlinear dy?namics. The relationship between coupling effect and flow stability is studied. The flow around an airfoil is simulated using characteristics finite element method and then the database of unsteady flow field is established accordingly. In order to analyze flow stability and flow pattern, the dominant modes are extracted with Proper Orthogonal Decom?position. Furthermore, the interaction among the distinct modes of airfoil flow is analyzed, and the relationship be?tween multi?mode interaction effect and flow instability in nonlinear fluid dynamic system is given.