PIV measurement method for flow field of flap slot

Abstract

The invention relates to a PIV measurement method for the flow field of a flap slot. A flap is divided into a test section and connection sections. The test section of the flap is made of a 0.5mm transparent PC plate, and is hollow inside. The connection sections of the flap are common solid flap sections. Based on the thermal bending characteristic of the PC plate, the PC plate can be bent by a heating rod into a radian required by the leading edge of the flap. Based on the impact resistance characteristic of the PC plate, the test section of the flap can be prevented from deforming at wind speed of 30m / s. A device for changing the state quantity of a flap is also provided. A fixed connection device is designed according to the basic contours of the flap and the main wing. The connectingdevice can be used to well solve the problem of airfoil flutter of large-span airfoils at high wind speed. For an airfoil with a rudder structure, the state parameters of the rudder can be adjusted. The experimental accuracy and the experimental efficiency can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel tests, and in particular relates to a model and a measurement method for measuring slot flow under different flap state quantities based on a PIV velocity measurement method. Background technique [0002] In the wind tunnel test, the PIV measurement of fine flow fields such as flap slots will make it difficult for the laser to illuminate the entire flow field area to be photographed due to the limitation of the gap space. The usual solution to this problem is to directly use the knowledge of geometric optics , as far as possible to find the largest area that can be photographed and shoot first, and for the remaining part of the area, it is necessary to rearrange the optical path and shoot again. Through the calculation of the PIV system, the two parts of the experimental results are spliced ​​to obtain the flow field of the entire shooting area result. [0003] The above-mentioned traditional...

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Problems solved by technology

[0003] The above-mentioned traditional method of shooting flap slit flow field based on PIV has the following defects: first, it is difficult to find the largest possible shooting area itself; second, the secondary arrangement of the optical path greatly increases the workload, and the efficiency very low; thirdly, splicing the results of the two measurements has a large error in the measurement results, not the experimental results of the same train, and there are many uncertainties

These methods usually can only achieve one effect, and cannot take into account the connection and change of state quantities. At the same time, under the experimental conditions of a small airfoil model, the traditional linkage mechanism has problems such as insufficient strength at high wind speeds.

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