Parametric Characterization of the Embedded Shock Phenomenon in Tension Cone Inflatable Aerodynamic Decelerators

摘要

Inflatable aeroshells, commonly referred to as Inflatable Aerodynamic Decelerators (IAD), have the advantage of increased payload mass fraction and more efficient fairing volume usage when compared to traditional rigid aeroshells. However, several unique design challenges exist for this kind of aeroshell. In particular for the tension cone type of IAD among these challenges is the change in the upstream flowfleld due to deformations of the flexible cone structure. A phenomenon known as embedded shock may develop due to the concavity of the surface created by the fluid and structure interaction causing local rises in surface pressure and temperature that may stress the material beyond its working limits and reduce the usefulness of this particular kind of inflatable aeroshell. In order to characterize this phenomenon, the deformed shape and flow field of the tension cone IAD are computed for a range of geometrical variations by means of rapid assessment tools, and conclusions show that proper design can prevent the embedded shock formation and, therefore, the adverse spikes in aerodynamic and aerothermal loads.