Non-Uniform Propagation of Moderate Strength Blast Waves in Wedge and Conical Hypersonic Nozzles

摘要

The blast wave equations in an unsteady environment are derived. For wedge and conical nozzles it is shown that the density has a power law variation with distance downstream from the throat when the local flow Mach number is large. The unsteady flow field behind the blast wave is solved by a perturbation technique and the self-similar solution of Mirels and Mullen is recovered in the first approximation. An approximate expression is given for the shock trajectory as a function of the instantaneous energy release, the nozzle geometry, and the stagnation conditions. (Author)