Coupling measurement device of particle three-dimensional stress and two-dimensional fluid velocity field

Abstract

The invention relates to a coupling measurement device of particle three-dimensional stress and a two-dimensional fluid velocity field, belonging to the field of hydraulic tests. The device comprises a computer, a PIV (Particle Image Velocimetry) fluid velocity measurement unit and a three-dimensional force measurement unit, wherein the PIV fluid velocity measurement unit and the three-dimensional force measurement unit are respectively connected with the computer; the PIV fluid velocity measurement unit is positioned outside the side wall of an experimental water tank; the three-dimensional force measurement unit mainly comprises a stressed particle assembly, a three-dimensional force measurement framework, a fixed part and three force measurement strain gauges; the stressed particle assembly is composed of stressed particles and a particle support plate which are fixedly connected into a whole; the three force measurement strain gauges are respectively installed in three axial directions of the three-dimensional force measurement framework and used for measuring three-dimensional stress of particles; and the computer is respectively connected with the PIV fluid velocity measurement unit and the three-dimensional force measurement unit and used for synchronously controlling, collecting and storing measurement data of the PIV fluid velocity measurement unit and the three-dimensional force measurement unit. The device disclosed by the invention is capable of synchronously collecting the particle three-dimensional stress and the two-dimensional fluid velocity field around the particles at high frequency and high quality, thus, an experimental foundation is laid for researching internal relation and interaction mechanism between the particle three-dimensional stress and the two-dimensional fluid velocity field.

Description

technical field [0001] The invention belongs to the field of water conservancy experiments, in particular to a device for measuring three-dimensional force on particles and coupled with two-dimensional flow velocity field. Background technique [0002] Under the action of turbulent water flow, the force on particles has obvious three-dimensional characteristics. Classical fluid mechanics shows that the force F of the particle D The relationship with the velocity V of the water flow is: [0003] F D = ρ C D A V 2 2 [0004] In the formula: ρ is the density of the water body, C D is the drag coefficient of the particle, and A is the effective area of ​​the particle upstream. A large number of studies have shown that the pulsation of water flow velocity follows a normal distribution, then from the above ...

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Problems solved by technology

The main disadvantage of this system is that the sampling frequency is low; the pressure on the particle surface measured by each pressure measuring hole is not the pressure distribution of the sa

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