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Pressure Pulsation Caused by Vortex Shedding from a Perforated Plate with Holes

带孔多孔板涡旋脱落引起的压力脉动

基本信息

批准号：
09650209
负责人：
SANO Masashi
金额：
$ 0.19万
依托单位：
Shizuoka Institute of Science and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650209/
关键词：
Flow-Induced Vibration Self-Excited Vibration Lock-in Fluctuating pressure Perfoated Plate Pipe Flow Vortex Shedding Lateral Vibration 自励起動

项目摘要

The pressure fluctuations accompanying the occurrence of the lock-in caused by the vortex shedding from the perforated plate were examined experimentally. Measurements were also made on the pressure fluctuations caused by the lateral vibration of the perforated plate excited axially by the piezoelectric element. The results are summarized as follows :(1) The occurrence of lock-in is significanfly affected by the flexural rigidity of the perforated plate. When this phenomenon is caused, the pressure fluctuation is considerably increased.(2) As the thickness of the perforated plate is increased, the lock-in velocity range shifts to a higher velocity, while the frequency of pressure fluctuation shows only a slight change.(3) The lock-in velocity range, as well as the frequency and amplitude of the pressure fluctuation during the occurrence of lock-in, depends on both the pipe length upstream and downstream from the perforated plate.(4) When the lock-in occurs, the in-phase lateral vibration of the perforated plate is generated. The plate displacement has a phase lag with respect to the differential pressure across the plate.(5) The pressure mode shapes in the pipe during the occurrence of lock-in agree quite well with those of the pressure fluctuation caused by the lateral vibration of the perforated plate excited axially by a piezoelectric element.(6) When the pressure fluctuation due to the issuing of unstable jets from the perforated plate is reflected at the pipe ends and transmitted back to the plate, the differential pressure fluctuation across the plate is increased. This differential pressure fluctuation causes the lateral vibration of the plate. By the resulting flow fluctuation, the pressure fluctuation is further amplified.

实验研究了穿孔板涡脱落引起的锁相压力波动。对压电元件轴向激发穿孔板横向振动引起的压力波动进行了测量。结果表明：(1)穿孔板的抗弯刚度对锁紧的发生有显著影响。当这种现象发生时，压力波动会大大增加。(2)随着穿孔板厚度的增加，锁相速度范围向更高速度偏移，而压力波动频率变化不大。(3)锁紧速度范围以及发生锁紧时压力波动的频率和幅值取决于孔板上游和下游的管道长度。(4)发生锁紧时，穿孔板产生同相横向振动。板的位移相对于板上的压差有相位滞后。(5)锁紧发生时管道内的压力模态与压电元件轴向激励穿孔板横向振动引起的压力波动模态吻合较好。(6)当穿孔板发出的不稳定射流引起的压力波动在管端反射并传回板时，板间压差波动增大。这种压差波动引起板的横向振动。由此产生的流量波动，进一步放大了压力波动。