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Method and apparatus for improving the accuracy of wind tunnel measurements in order to correct the influence of a suspension device

A suspension device, precision technology, applied in the field of improving the accuracy of wind tunnel testing to correct the influence of suspension devices and devices, to achieve the effect of avoiding measurement accuracy

Inactive Publication Date: 2007-12-05
AIRBUS OPERATIONS GMBH
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Problems solved by technology

But again it cannot be measured for different suspension wire diameters interpolated to zero for the computer

Method used

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  • Method and apparatus for improving the accuracy of wind tunnel measurements in order to correct the influence of a suspension device

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Embodiment Construction

[0035] 1 shows a graph with measured drag coefficients of an aircraft model suspended on a wire suspension in a wind tunnel, which are acquired, evaluated and corrected according to a first variant of the method according to the invention.

[0036] On the abscissa of the graph in FIG. 1, the respective effective diameter d of the suspension wires is indicated in millimeters. If the respective suspension wire is not fitted with a sleeve for increasing the effective diameter in the wind tunnel, it is assumed in the context of the description of the method that the effective diameter in this case is equal to the suspension wire diameter. The uncorrected (raw) drag coefficients measured for the respective effective diameter of the aircraft model, including the wire suspension and interference between the aircraft model and the wire suspension, are plotted as an example on the ordinate.

[0037] A common minimum diameter of suspension wires for suspensions of aircraft models in wind ...

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Abstract

The invention relates to a method for improving the accuracy of wind tunnel measurements, especially for correcting the influence of a suspension device. According to said method, a model, particularly an aircraft model, is introduced into a wind tunnel on the suspension device that comprises several suspension wires, and at least one sleeve is mounted on one respective suspension wire. The inventive method comprises the following steps: at least two measurements are taken on the same model configuration at least at one respective effective diameter and / or the diameter of the suspension wire in order to determine at least two raw measured values and determine a corrected final measured value for the model from at least two raw measured values. According to a first embodiment of the disclosed method, the effective diameters of the suspension wires are reduced in at least three stages by removing mounted sleeves when detecting raw measured values of the drag coefficient of the model. A final measured value of the drag coefficient, which is corrected by the influence of the suspension device and the interference between the model and the suspension device, can be determined from the raw measured values using interpolation. According to another embodiment, the correction is made by forming the difference between only two raw measured values, one of which is determined from the diameter of the suspension wire without the mounted sleeves. The inventive method is suitable for correcting all aerodynamic parameters that can be measured in wind tunnels. The invention further relates to an apparatus for carrying out said method.

Description

technical field [0001] The invention relates to a method for improving the accuracy of wind tunnel testing to correct the influence of the suspension device, wherein the model is set on the suspension device with a plurality of suspension steel wires and loaded into the wind tunnel, and each suspension steel wire is equipped with At least one sleeve to increase the suspension wire diameter to an effective diameter. [0002] The invention also relates to a device for carrying out a method for improving the accuracy of wind tunnel testing to correct for the influence of suspensions, wherein the model is installed in a wind tunnel with suspensions having a plurality of suspension wires. Background technique [0003] According to the prior art, the model is inserted into the air flow of the wind tunnel by means of a so-called model suspension. The selection of the optimum suspension for the identified model should take into account the available wind tunnel equipment and the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/06G01M9/04G01L5/16
CPCG01M9/06G01M9/062
Inventor 德特勒夫·施韦茨勒彼得·马伊
Owner AIRBUS OPERATIONS GMBH
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