轴向间距变化及涂层对高压涡轮叶片振动的影响  

Effects of axial spacing variation and coating on vibration of high-pressure turbine blades

作　　者：程前 王虎 沈莲 张根 赖巍 曹正 CHENG Qian;WANG Hu;SHEN Lian;ZHANG Gen;LAI Wei;CAO Zheng(AECC Sichuan Gas Turbine Establishment,Chengdu 610500,China;School of Electrical Engineering and Automation,Anhui University,Hefei 230039,China)

机构地区：[1]中国航发四川燃气涡轮研究院,成都610500 [2]安徽大学电气工程与自动化学院,合肥230039

出　　处：《振动与冲击》2023年第9期322-327,338,共7页Journal of Vibration and Shock

基　　金：安徽省自然科学基金(2108085QE224)。

摘　　要：为了研究不同轴向间距及涂层对涡轮叶片振动响应的影响,采用SST(shear stress transportation)湍流模型对高压涡轮导叶尾迹作用下的某高压涡轮转子叶片非定常流动进行数值模拟。通过对时域叶片表面压力载荷进行快速傅里叶变换(fast Fourier transform,FFT)频域分解获取激振力的谐波分量,建立了三维非定常流场激励下特定振动模态的涡轮叶片强迫响应分析模型,利用压力扰动均方根有效值作为气动激励强度的量化参数以及获取流场激励下的叶片幅值响应,对比了不同轴向间距、考虑有无涂层的叶片振动响应差异。结果表明:在保持进气条件不变时,存在叶片振动响应幅值随轴向间距的增加而减弱的趋势,即轴向间距的增加能有效降低叶片的振动应力;叶片涂层亦有助于降低叶片的振动响应幅值。Here,to study effects of different axial spacings and coatings on vibration responses of turbine blades,the shear stress transportation(SST)turbulence model was used to simulate unsteady flow of a certain high-pressure turbine rotor blade under the action of high-pressure turbine guide vane wake.Harmonic components of excitation force were obtained by using FFT(fast Fourier transform)frequency domain decomposition for time domain blade surface pressure load,and the forced response analysis model for turbine blade’s specific vibration mode under excitation of 3D unsteady flow field was established.RMS value of pressure disturbance was used as quantitative parameter of aerodynamic excitation intensity and amplitude response of blade under excitation of flow field was obtained.Differences of blade vibration responses with different axial spacings and with/without coating were compared.The results showed that blade vibration response amplitude decreases with increase in axial spacing when intake condition keeps unchanged,i.e.,increase in axial spacing can effectively reduce vibration stress of blades;blade coating can also help to reduce vibration response amplitude of blades.

关 键 词：高压涡轮 轴向间距 涂层 非定常流场 快速傅里叶变换(FFT) 振动响应 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3