汽轮机失谐叶盘局部化振动试验研究  

Experimental Study on Local Vibration of Mistuned Blade Disk of Steam Turbine

作　　者：赵英凯 潘宏刚 陈尚年 张新虹 李思萱 于光佐 ZHAO Ying-kai;PANG Hong-gang;ZHANG Xin-hong;CHEN Shang-nian;LI Si-xuan;YU Guang-zuo(School of Energy and Power Engineering,Shenyang Instituteof Engineering,Shenyang 110136,Liaoning Province;Shanxi Luneng Hequ Power Generation Co.Ltd.,Hequ 036509,Shanxi Provicne)

机构地区：[1]沈阳工程学院能源与动力学院,辽宁沈阳110136 [2]山西鲁能河曲发电有限公司,山西河曲036509

出　　处：《沈阳工程学院学报（自然科学版）》2019年第4期317-322,共6页Journal of Shenyang Institute of Engineering:Natural Science

基　　金：辽宁省高等学校基本科研项目(LQN201720);沈阳工程学院学生科技创新项目(XNXS-1804)

摘　　要：针对汽轮机叶盘系统由于失谐将产生局部化振动问题,搭建了失谐叶盘系统,对不同工况失谐叶盘系统进行固有频率和振型测量。结果表明:随着失谐量增加,叶盘系统的固有频率下降,失谐量越大,频率下降越明显;在节线数时,出现一边的振动失谐变化最明显,振动区域发生改变;在节线数时,在轮盘上的节经线变化明显,发生一定弯曲。因此,在制造汽轮机的叶轮时,应避免应力集中导致叶轮裂纹及损坏,保持轮盘平衡孔数为奇数。Aiming at the local vibration of turbine blade disk system due to mistuning, a mistuned blade disk system was built to measure the natural frequencies and vibration modes of the system under different working conditions.The results show that with the increase of detuning, the natural frequency of the blade disk system decreases, and the larger the detuning, the more obvious the frequency decrease.At the node number n = 2, the vibration dissonance of one side is the most obvious, and the vibration area changes;while at the number of knots n = 3, the meridians on the roulette wheel change significantly and a certain bending occurs.The amplitude of the symmetrical position of the simulated impeller is the same.Therefore, in the manufacture of turbine impeller, stress concentration should be avoided leading to impeller cracks and damage, and the number of disk balance holes should be odd.

关 键 词：汽轮机 失谐叶盘 沙型 振动局部化 

分 类 号：O329[理学—一般力学与力学基础]