摘要
进一步完善了非定常雷诺平均N-S方程求解程序,并借助运动网格生成方法,对周期性俯仰运动下NACA0012翼型的非失速绕流和动态失速问题进行了数值模拟研究,分析了振荡翼型的迟滞效应以及俯仰运动各个参数对迟滞效应的影响。数值模拟结果与实验结果对比表明,本文发展的数值模拟方法在模拟非失速绕流时是可靠的;结果还表明,随着振幅、折合频率的增加迟滞效应增强,平均攻角对迟滞效应无影响;保持无量纲参数——振幅和折合频率的乘积——恒定时,迟滞效应相同。在模拟动态失速问题时,本文方法在深度失速下结果与实验符合较好,而在轻度失速下符合较差,经分析表明这是不同条件下非定常流动对湍流模型和转捩的敏感程度不同所致。
Based on the moving mesh method, numerical simulation of 2-D unsteady viscous flow around oscillating NACA0012 airfoil was carried out, then the hysteresis effect and the effect of parameters on it were investigated. The numerical results are in good agreement with the published data when dealing with the unstalled problem and the effect of oscillating amplitude. Mean incidence and reduced frequency on the hysteresis loop was also studied. A non-dimensional analysis revealed that the hysteresis effect would be the same just provided the same multiplying numerical value of reduced frequency and amplitude. For the dynamic stall problem, the result of light stall depended on the sensitivity of turbulence model and transition model.
出处
《燃气涡轮试验与研究》
2009年第3期1-8,共8页
Gas Turbine Experiment and Research
基金
国家自然科学基金(50776003)资助项目
北京航空航天大学“蓝天计划”蓝天新星资助项目
关键词
非失速
动态失速
振荡翼型
迟滞效应
unstalled
dynamic stall
oscillating airfoil
hysteresis effect
