Abstract
Behind a moving shock the flow around a blunt body is initially unsteady and accompanied by a bow wave running upstream. After a certain formation time, this bow wave decelerates and reaches the stand-off distance Δ. The flow becomes a steady one. In a constant cross-section shock tube the bow wave running upstream was recorded by means of streak pictures taken ahead of various blunt bodies at different shock velocities. From this, it was possible to derive stand-off distances and formation times as well as a function of the distance-time curve in the dimensionless coordinates ξ and τ. This function could be established using two different methods, i.e. the mass-balance method and the assumption of a transonic steady flow. The latter assumption was confirmed with the aid of density measurements performed by means of a laser differential interferometer.
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