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Wave flow velocity measuring system based on laser doppler speed measurement, water tunnel type swimming machine system and speed correcting method

A technology of Doppler speed measurement and Doppler speed meter, which is applied in the testing/calibration of speed/acceleration/shock measurement equipment, speed/acceleration/shock measurement, fluid velocity measurement, etc., and can solve the problem that is not suitable for measuring high turbulence Flow, low frame rate, etc.

Pending Publication Date: 2018-11-13
沈熊
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Particle image velocimetry (PIV) has also been widely used in flow velocity measurement; its advantage is that the instantaneous two-dimensional flow field velocity distribution can be obtained by taking pictures of particle displacement and image analysis; however, the frame frequency of continuous shooting is low, which is not suitable for Measure high turbulent flow; in addition, it requires the measurement object to have light-transmitting windows in two directions, which also limits the application of PIV in small water cave swimming machines

Method used

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  • Wave flow velocity measuring system based on laser doppler speed measurement, water tunnel type swimming machine system and speed correcting method
  • Wave flow velocity measuring system based on laser doppler speed measurement, water tunnel type swimming machine system and speed correcting method
  • Wave flow velocity measuring system based on laser doppler speed measurement, water tunnel type swimming machine system and speed correcting method

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Embodiment 1

[0074] The invention provides a water cave swimming machine system based on laser Doppler velocimetry (LDV), the core technology of which is to use a specially designed and improved laser Doppler velocimeter to measure and correct the speed characteristics of the water cave swimming machine , realizing the integrity and innovation of the water cave swimming machine. Such as figure 1 As shown in the overall structural diagram of the laser Doppler speed measuring water cave swimming machine system, the water cave swimming machine system includes: a power box that drives the water flow; after the water flows out of the power box, it forms a mainstream before entering the rear grid After the water flows through the rear grid, it is symmetrically divided into two paths, each of which flows back to the power box through the return pipe at the bottom to complete the water circulation of the water cave; the power box is the power source for the entire water cave swimming machine to ci...

Embodiment 2

[0081] Illustrate a kind of speed correction method based on laser Doppler velocimetry technology (LDV) water hole type swimming machine system, described method comprises the steps:

[0082] Step SS1, the water flows in from the water inlets on both sides of the bottom of the power box; the water flows upward through two sets of symmetrical deflectors; after passing through the propeller blades and the grid of the first rectifier, the vortex is broken and the scale becomes smaller; and then passes through a set of deflectors After the second rectifier grid, change the direction of water flow and flow out horizontally from the outlet above the power box.

[0083] Step SS2, the mainstream area formed by the water flow at the outlet of the power box includes, from the bottom surface of the swimming machine to the water surface, the flow direction of the water flow is forward, and flows to the rear, and enters the rear grid, before being divided into two paths. Return from the re...

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Abstract

The invention discloses a wave flow velocity measuring system based on laser doppler speed measurement, a water tunnel type swimming machine system and a speed correcting method, capable of accuratelymeasuring the wave water flow speed and speed distribution, providing a reliable basis for calibrating the swimming speed of a swimming machine and evaluating the performance of the swimming machine.The wave flow velocity measuring system comprises a power box, a main flow area, and backflow pipelines divided into two paths. The front ends of a light receiving / emitting unit is provided with a light guide pipe with a sealing window, and the light guide pipe penetrates through the wave water surface, the laser beam is irradiated to the main flow area to form a measuring body, and the scatteredlight of the measuring body can be received, and the LDV flow velocity measurement is realized. A measurement body reflector converts the backward scattered light into forward scattered light, and the intensity of the received scattered light is greatly improved. A small-power semiconductor laser is adopted, particles do not need to be added manually, and a good signal-to-noise ratio can be obtained. The system can be used for a flow velocity measurement occasion with a wave free surface, such as a large-scale wave groove, a water tunnel type swimming machine, a ship navigation speed and thelike, and high far advanced technology than other flow velocity measuring technology.

Description

technical field [0001] The invention belongs to the technical field of fluid mechanics water tunnel, swimming machine application and flow velocity measurement, and relates to the use of laser Doppler velocity measurement technology for measuring the flow velocity characteristics of water cave swimming machines; at the same time, the invention also relates to the use of laser Doppler velocity measurement The invention is used in other flow velocity measurement occasions with wave water surfaces; in particular, it relates to a wave current flow velocity measurement system based on laser Doppler velocity measurement, a water cave swimming machine system and a velocity correction method. Background technique [0002] Water tunnels for fluid mechanics experiments are widely used in various model experiments, such as ships, submarines, and object models of various shapes; large-scale water tunnel swimming machines for the study of human swimming strokes have also been built in man...

Claims

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Application Information

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IPC IPC(8): G01M10/00G01P5/26G01P21/02
CPCG01M10/00G01P5/26G01P21/025
Inventor 沈熊郁漫天沈小钧
Owner 沈熊
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