Method of predicting gap between model tail cavity and supporting rod for wind tunnel test

Abstract

The invention discloses a method of predicting a gap between a model tail cavity and a supporting rod for a wind tunnel test, and relates to the field of experimental fluid mechanics. The method comprises: representing the gap between the model tail cavity and the supporting rod by utilizing a difference value of physical data and characteristic data, wherein the physical data comprises a model tail cavity radius and a supporting rod radius, and the two radiuses are in a difference relation, the characteristic data comprises deflection angle data, model tail cavity supporting rod displacementand supporting rod head displacement, and the deflection angle data and the model tail cavity supporting rod displacement are summed and subtracted from the supporting rod head displacement to obtainan absolute value, the deflection angle data comprises a distance between the model tail cavity and a supporting rod head and a sine value of a model deflection angle, and the two are in a product relation. The method is simple, easy to use and convenient to implement, and can predict the collision of the model and the supporting rod before an experiment is carried out, thereby helping to improveexperiment planning, being conducive to improving experiment precision and experiment efficiency, and saving experiment resources.

Description

technical field [0001] The invention relates to the field of experimental fluid mechanics, in particular to a method for predicting the gap between a model tail chamber and a strut used in a wind tunnel test. Background technique [0002] At present, two methods are usually used to judge whether the tail cavity of the model collides with the strut. The first is to determine whether a collision has occurred by analyzing whether there is an abnormal change in the aerodynamic curve. The second is to judge whether a collision has occurred by painting the dye on the pole before the test and observing whether there are collision marks left on the place where the dye is applied. The above two methods are mainly used to confirm and verify whether the model and the strut have collided in the wind tunnel test, and both have post facto nature, that is, it can be reflected only after the collision has occurred, and cannot be used for collision prediction, and cannot be used before the ...

AI Technical Summary

Problems solved by technology

The above two methods are mainly used to confirm and verify whether the model and the strut have collided in the wind tunnel test, and both have post facto nature, that is, it can be reflected only after the collision has occurred, and cannot be used for collision prediction, and cannot be used before the experiment starts. Predicting whether a collision will occur has no real effect on improving the accuracy of the experiment, improving the efficiency of the experiment, and saving experimental resources

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