Random vibration characteristics of perforated plates in parallel flow

29th IAHR Symposium on Hydraulic Machinery and Systems

Xue, Cheng^1 ; Zhu, Baoshan^2 ; Liu, Xiaobing^1 ; Nekomoto, Yoshitsugu^3 ; Liu, Jinsheng^4 ; Liu, Dongni^5

Key Laboratory of Fluid and Power Machinery, Ministry of Education, Department of Energy and Power Engineering, Xihua University, Chengdu

610039, China^1

State Key Laboratory of Hydroscience and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing

100084, China^2

Mitsubishi Heavy Industries, Ltd., Hyogo, Japan^3

School of Aerospace Engineering, Tsinghua University, Beijing

100084, China^4

Institute of Naval Architecture and Ocean Engineering, Dalian Maritime University, Dalian

116026, China^5

关键词: Acceleration signals;    Flow induced noise;    Physical phenomena;    Pressure differential;    Pressure fluctuation;    Pressure signal;    Random vibrations;    Wind velocities;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/240/6/062005/pdf
DOI  :  10.1088/1755-1315/240/6/062005

来源: IOP

【 摘 要 】

The vibration of perforated plate contains various complex physical phenomena in the fluid field, which is a key issue in fluid-structure interaction. Perforated plates have been widely used in power plants but the flow induced noise and vibration may give arise to some serious adverse impact. Therefore, it is of great significance to clarify the random vibration characteristics and noise problem of perforated plates in parallel flow. In this paper, the perforated plates were experimentally studied in a wind tunnel. Acceleration signal sensors are used to analyze the displacement and deformation of perforated plates and the pressure signals are measured by SETRA C266 micro pressure differential sensor, and the pulsating characteristics of perforated plates are analyzed by fast fourier transform (FFT), respectively. Through the analysis, it is found that the main pressure fluctuations of the flow direction are concentrated in the middle position and the tail. And the pressure fluctuations on the left and right sides of the perforated plates is very close in the spanwise position, and less than the center. Some key factors on the random vibration of perforated plates are discussed including wind velocity, hole diameter, hole pitch, plate thickness and the clearance height between the perforated plate and the cavity (It is means back space gap height). The analysis of the results indicated the impact of each factor. In detail, lower wind velocity and smaller hole diameter are beneficial to reduce the random vibration of perforated plate, however, larger hole pitch size and larger plate thickness are favorable to reduce the random vibration. The test results of this paper can provide a basis for the design of perforated plates.