PIV wind tunnel test method for ship air flow field measurement

Abstract

The invention relates to a PIV wind tunnel test method for ship air flow field measurement, which comprises the steps that a large number of tracer particles are scattered in the flow field of a test wind tunnel, the tracer particles are enabled to move along with the flow field, a generated laser beam is expanded into a sheet beam lighting flow field through a combined lens, a cross-frame CCD camera is utilized to continuously shoot flow field pictures, and multiple groups of front and back tracer particle images are acquired; thus the flow field vorticity, a flow field flow line and a flow field equal velocity line are acquired; then the surface of a ship model of a waterline model made of a metal material is coated with matte black paint; CCD cameras are parallelly placed, test measurement is performed in a mode that the axis of each CCD camera is perpendicular to a laser sheet light surface, a PIV two-dimensional measurement mode is adopted, an included angle of a central longitudinal line of the ship model and an incoming flow wind direction in the wind tunnel and a rolling angle or a pitching angle of the ship model are respectively changed; and thus multiple groups of measurement data of the tracer particles in different measurement sections of the ship model are acquired, multiple air flow field velocity cloud charts and air flow field flow line charges are generated finally so as to complete spatial reconstruction for different measurement sections of the ship model.

Description

technical field [0001] The invention relates to a wind dynamic test technology, in particular to a PIV wind tunnel test method for measuring the air flow field of a ship. Background technique [0002] Laser particle flow field testing equipment (PIV) is a general flow field testing equipment, which can generally be used to measure the air flow field around the specimen in the wind tunnel or in the external wind environment, and has the advantages of high measurement accuracy and fast measurement speed. . [0003] The basic test process of general PIV laser particle flow field test equipment is as follows: figure 1 As shown, the experimental data processing method is as follows figure 2 As shown, the required measurement surface is as image 3 shown. from figure 1 According to the measurement method shown, in order to comprehensively measure the flow field at the stern of the ship, thousands of manual shifts are required, and each shift needs to be corrected and aligned...

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a PIV wind tunnel test method for the measurement of the air flow field of the ship, to solve the defects of the prior art that the measurement progress is slow and time-consuming, and to speed up Improve the test progress, improve the positioning accuracy and speed, and have good use value

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