A flow field measurement system and measurement method under model pitching motion

Abstract

The invention provides a flow field measurement system and measurement method under model pitching movement. A first upper guide rail and a second upper guide rail are arranged on a water tank, lowerguide rails are arranged on a support, two trailers are arranged on the two upper guide rails, lateral connecting rods are arranged on a first trailer, first sliders are arranged on the lateral connecting rods, a second trailer is connected with reflectors through connecting rods, second sliders are arranged on the lower guide rails, sliding vanes are arranged on the first sliders and the second sliders, bases are arranged on the two sliding vanes, a laser device and a camera are arranged on each base, a horizontal connecting rod is arranged between the first trailer and the second trailer, athird slider is arranged on the horizontal connecting rod, a stepping motor and an encoder are arranged at the lower end of the third slider, the lower end of the encoder is connected with a force balance, and the lower end of the force balance is connected with a wing profile to be detected. The system and the method are low in cost, high in measurement efficiency, applicable to measurement of model dynamic pitching movement and also applicable to flow field measurement of a model in other specific dynamic movement modes.

Description

technical field [0001] The invention relates to a flow field measurement system, in particular to a flow field measurement system and a measurement method under a model pitching motion, and belongs to the technical field of ship hydrodynamic tests. Background technique [0002] When the airfoil in pitch motion exceeds the critical angle of attack, the flow field will produce complex unsteady separation and large-scale vortex structures. A stall phenomenon occurs, usually called a dynamic stall. The phenomenon of dynamic stall exists in the rear rudder of ships, various aircraft and wind turbines. The pitching motion can make the airfoil obtain higher lift at a large angle of attack, expand the available angle of attack range of the airfoil, and make it gain benefits in terms of hydrodynamics and aerodynamics. At the same time, the pitching motion will also affect the stability and safety of the structure. cause adverse effects. In recent years, extensive and in-depth disc...

AI Technical Summary

Problems solved by technology

At present, there are very few records of PIV experiments under model pitching motion at home and abroad. This invention proposes a flow field measurement system and measurement method based on PIV technology under model pitching motion, which is of great value for the study of flow characteristics under model pitching motion.

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