基于温度体动网格方法的微弯薄翼振动问题  

Vibration of Thin Cambered Blade Based on Temperature Analogy

作　　者：陈炎[1] 曹树良[1] 祝宝山[1] 梁开洪[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点试验室,北京100084

出　　处：《机械工程学报》2010年第10期170-175,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(50776052)

摘　　要：为研究微弯薄翼转轮在运行过程中存在的振动问题,发展基于温度体动网格模型的流固耦合算法。流体控制方程采用任意拉格朗日—欧拉方法描述下的基于特征线方程的分离算法求解,时间域采用特征线方程进行离散,动量方程采用非增量型分离算法求解。在每个时间步上采用温度体模型生成动态网格,并传递边界条件。温度体动网格方法将边界处的节点位移映射为求解域的温度边界条件,采用固体导热方程作为控制方程求解得到内部节点温度,并将其作为节点的动态位移。数值方法模拟转轮运行在工作攻角时,翼型振动存在的连锁区域。并对连锁区域的范围,涡脱落特性和翼型发生自激振动的可能性进行研究。作为对试验数据的补充,数值模拟还预测了运行在工作攻角附近情况下的连锁区域。The vibration of thin cambered blade is investigated based on temperature analogy.The fluid flow equations using arbitrary Lagrange-Euler approach are solved by characteristic based method.In every time step,temperature analogy is used to create the dynamic meshes.The displacement of the moving boundary is considered as temperature boundary conditions,the internal node displacement is obtained by solving heat conduction equation.Numerical results show the occurrence of lock-in zone at the working attack angle.The patterns of vortex shedding and the probability of self-excited vibration are also investigated.And as a supplement,lock-in zone of different attach angle is predicted by numerical simulation which is not given in the experiment result.

关 键 词：特征线方程 分离算法 温度体动网格模型 旋涡脱落 连锁区域 自激振动 

分 类 号：TH312[机械工程—机械制造及自动化] O351.2[理学—流体力学]