Pressure high chord thickness ratio empty box bluff body streaming flow induced vibration test device

Abstract

The invention discloses a pressure high chord thickness ratio empty box bluff body streaming flow induced vibration test device. An empty box is arranged in a test section water tank, the empty box isof a cuboid, cylinder or irregular structure with openings in the top end and the bottom end, and holes consistent in size and shape are formed in the portion, corresponding to the opening area in the top end of the empty box, of a top plate of the test section water tank; a test measurement part is arranged outside the test section water tank, and comprises a vibration displacement measurement system, a micro pulsating pressure sensor array, a PIV system, a multifunctional dynamic measurement instrument and a synchronous clock; oscillating bar vibration signals obtained by the vibration displacement measurement system and water flow pulsating pressure change signals detected by the micro pulsating pressure sensor array are transmitted to the multifunctional dynamic measuring instrument respectively and recorded, and signals of the multifunctional dynamic measurement instrument and the PIV system are synchronized through the synchronous clock. The device has the advantages of both contact measurement and non-contact measurement, and improves the precision of vibration displacement measurement while not interfering with a flow field.

Description

technical field [0001] The invention belongs to the field of fluid-solid coupling vortex-induced vibration tests, and relates to a test device for synchronously measuring pulsating pressure, vibration displacement and flow field of a blunt body flowing around a wall surface. Background technique [0002] In the study of flow around a bluff body, due to the limitation of measurement means, the measurement of the vibration displacement response of underwater structures has always been a difficult point. [0003] At present, the vibration measurement of structures is mainly divided into contact measurement and non-contact measurement. Among them, the contact measurement includes the second integral of the acceleration sensor and the linear displacement sensor. Non-contact measurement mainly includes laser displacement sensors, eddy current sensors, and magnetostrictive displacement sensors. However, in the test of flow around a blunt body under pressure, the above-mentioned m...

AI Technical Summary

Problems solved by technology

In addition to interfering with the flow field in contact measurement, each sensor has different defects: 1. The acceleration sensor not only adds additional mass to the structure to affect the vibration characteristics of the structure, but also whether it is software secondary integration or hardware secondary integration, the integration result is consistent with the actual displacement of the structure There is a certain deviation; 2. The linear displacement sensor has low precision and high delay

The advantage of non-contact measurement is that it will not interfere with the flow field, but: 1. The working range of the eddy current sensor is proportional to the size of the probe. Only metal structures can be measured 2. The magnetostrictive displacement sensor has a large size and can only measure linear displacement and can only measure magnets; 3. Due to the refraction of the laser underwater, the laser displacement sensor will affect the accuracy of the vibration displacement of underwater objects

Images