Device used for observing of ventilating cavitation flow-field regularity

Abstract

The invention discloses a device used for observing of a ventilating cavitation flow-field regularity, and belongs to the technical field of flow measurement. The device comprises a pulsed laser, a cavitation water tunnel, a test component, fluorescent paint and a CCD camera. The pulsed laser emits a sheet light source, wherein the wave length of the sheet light source is L1. The surface of the test component is coated with the fluorescent paint. The sheet light source emitted by the pulsed laser irradiates the fluorescent paint on the surface of the test component, and light with the L2 wave length is reflected. The test component is arranged inside the cavitation water tunnel. The front end of the test component faces the water flow direction. The pulsed laser is arranged above the cavitation water tunnel. A light outlet of the pulsed laser directly faces to the test component, and the test component is placed in the plane, wherein the central axis is placed in the plane which is placed with the sheet light source emitted by the pulsed laser. An optical axis is perpendicular to the plane which is placed with the sheet light source emitted by the pulsed laser. The light reflecting phenomenon in a flow-field can be solved, and the device is of the great significant for improving the PIV accuracy.

Description

technical field [0001] The invention relates to the technical field of flow measurement, in particular to a device for observing the regularity of the ventilation cavitation flow field. Background technique [0002] The development of flow measurement technology is of great significance to the research and solution of a series of basic fluid mechanics problems involved in aviation, aerospace, shipbuilding and other industries. At present, PIV (Particle Image Testing Technology) has been widely used, which has greatly promoted the research of flow field motion characteristics in the fields of aerodynamics and hydrodynamics. However, since PIV uses a sheet light source to irradiate the flow field, it cannot be measured near the wall, which reduces the application range of the PIV system. [0003] The ventilated cavitation flow field is of great significance to ship drag reduction. When using PIV to carry out the observation and measurement of the ventilated cavitation flow fi...

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Problems solved by technology

However, since PIV uses a sheet light source to irradiate the flow field, it cannot be measured in the near-wall area, which reduces the application range of the PIV system.

[0003] The ventilated cavitation flow field is of great significance to ship drag reduction. When using PIV to carry out the observation and measurement of the ventilated cavitation flow field, the pulsed laser light source or continuous laser light source is irradiated on the surface of the experimental model. Since the laser has good monochromaticity and high coherence And strong directionality, the laser reflection on the surface of the experimental model is extremely strong, making it impossible to distinguish the model surface from the particle image in the recorded image, and the motion information obtained by processing also has large errors, or even errors

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