Dynamic wind tunnel drop testing on internal store separation
The aerodynamic and motion characteristics of a cylinder separated from a cavity-model were studied by the wind tunnel freedrop testing based on dynamic similarity.The pressure distribution measurement on the surface of the dynamic model was explored by using the fast-response pressure sensitive paint(Fast-PSP).The effects of different attack angle(α=0°,-1.5°,-3°)of the cavity model and different positions of the store in the cavity(L0 =25 mm,39 mm)were studied.The results show that the position of the store in the cavity has the greatest influence on the separation characteristics.When the distance is L0 =25 mm,the pressure on the head-area of the store-model is obviously higher than that in the rear-area,which results in a nose-up pitching moment,increasing the pitch-angle of the store-model and finally collides with the cavity-model.Reducing the angle-of-attack of the cavity-model does not change the effect of the store-model colliding with the cavity-model.When the distance is L0 =39 mm,the store-model can be safely separated from the cavity-model at the given angle-of-attack.
internal weaponstore separationaerodynamic interferencewind tunnel drop testingunsteady effect
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