不同展弦比下扭转叶片振动特性分析

以燃气轮机扭转叶片为研究对象,建立不同展弦比下的叶片结构模型,对叶片的固有频率求解,对叶片不同展弦比下振动特性进行讨论分析,得出各展弦比下叶片的固有振动特性规律。结果表明:定宽度时,叶片的高阶次和小展弦比区域振动频率受展弦比影响更为敏感,且随着展弦比增加,叶片的各阶固有频率均降低;定长度时,叶片的弯曲振动频率,随着展弦比的增加而增大,而扭转振动频率却出现一定幅度的上升,同时叶片的扭转振动频率较弯曲振动频率变化更明显。

Analysis of Vibration Characteristics of Twisted Blades Under Different Aspect Ratio

The gas turbine twisted blade is taken as the research object.A blade structure model with different aspect ratio is established.The natural frequencies of blades are solved,and the vibration characteristics of blades under different aspect ratio are discussed and analyzed.The natural vibration characteristics of blades under different aspect ratio are obtained.The results show that the high order and small aspect ratio region vibration frequency of blade is more sensitive to aspect ratio when the width is fixed,and the natural vibration frequency of blade decreases with the increase of aspect ratio;the bending vibration frequency of blade increases with the increase of aspect ratio,but the torsional vibration frequency appears when the length is fixed.The vibration frequency of the blade is more obvious than that of the bending vibration frequency.