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.

通过实验检查了伴随着由穿孔板的涡流引起的锁定发生的压力波动。还对由压电元件轴激发的穿孔板的横向振动引起的压力波动进行了测量。结果总结如下：（1）锁定的发生是显着的，受穿孔板的弯曲刚度影响。当引起这种现象时，压力波动会大大增加。（2）随着穿孔板的厚度的增加，锁定速度范围移至较高的速度，而压力的频率仅显示略有变化。（3）锁定速度范围以及锁定速度的频率和锁定的频率上的锁定范围，并且锁定的频率在锁定范围内，并且锁定的频率在锁定范围内，并且锁定范围限制了，并且锁定范围限制了，并且锁定范围限制了，并且会出现在发生的情况下，并且锁定速度范围内的锁定范围和稳定性范围都在发生上升的情况下，并且锁定速度范围和稳定性范围均匀延伸，并且会导致锁定范围和稳定性范围内的锁定范围和稳定性范围。（4）发生锁定时，会产生穿孔板的相相横向振动。板位移相对于整个板上的差压力具有相位滞后。（5）在锁定发生过程中，管道的压力模式与锁定的压力模式形成非常吻合，这与压力元素的横向振动在压电元件中均匀地反映了轴向的侧面，轴向侧面激发了横向振动引起的压力波动引起的压力波动。在板上，越过板上的差压力波动增加。这种差压力波动会导致板的横向振动。通过产生的流动波动，压力波动进一步扩增。