阵列缝隙下弱抽吸流动的功率谱特性研究F

     王晓宇   贺静   林梅          

          （西安交通大学能源与动力工程学院, 西安  710049）

摘  要：选取了安装纵向阵列叶片时T型通道中受弱抽吸作用最强的测量截面流向速度信号，研究了不同法向位置和不同主流速度、抽吸比工况的功率谱特性，并从层流底层所受影响的角度进行了分析。研究结果表明，弱抽吸作用主要会破坏层流底层。距离壁面越远，弱抽吸作用对功率谱的影响程度越小，功率谱密度越小，惯性子区范围越大。主流速度一定时，抽吸比越大，对层流底层的破坏越小，功率谱密度越小，惯性子区范围越大。抽吸比一定时，主流速度越大，功率谱密度越大，惯性子区则不受影响。

关键词： T型通道；弱抽吸；功率谱；层流底层；惯性子区

中图分类号： TB126            文献标识码：A            文章编号：                                                   

Characteristics Study on Power Spectrum of Weak Suction

Flows With Array Blades         

WANG Xiao-Yu   HE Jing   LIN Mei          

(School of Energy and Power Engineering, Xi'an Jiaotong University, Xi’an 710049, China) 

Abstract: The streamwise velocity signals of the strongest section affected by weak suction in the T-channel with vertical array blades were selected to investigate their power spectrum characteristics under the  condition of different wall-normal positions, different cross velocities and suction ratios. The observed power spectrum were analyzed from the point of laminar sub-layer. The results show that weak suction mainly destroys the laminar sub-layer. Further away from the wall, the effect of weak suction on the power spectrum will be smaller, and if the smaller power spectral density, the range of inertial sub-regions will be larger. When the mainstream velocity is constant, the larger the suction ratio is, the smaller the damage to the laminar bottom layer will be, the smaller the power spectral density will be, and the larger the inertia sub-region will be. When the suction ratio is constant, the larger the mainstream velocity is, the greater the power spectral density is, and the inertia sub-region is not affected.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

Key words:  T-junction；weak suction；power spectrum；laminar sub-layer；inertial sub-region