UNSTEADY AERODYNAMIC FLOW FIELD ANALYSIS OF THE SPACE SHUTTLE CONFIGURATION Part Ⅲ:UNSTEADY AERODYNAMICS OF BODIES WITH CONCAVE NOSE GEOMETRIES

摘要

An analysis of the unsteady aerodynamics of bodies with concave nose geometrics has been performed. The results show that the experimentally observed pulsating flow on spiked bodies and in forward facing cavities can be described by the developed simple mathematic model of the phenomenon.nStatic experimental data is used as a basis for determination of the oscillatory frequency of spike-induced flow pulsations. The agreement between predicted and measured reduced frequencies is in general very good. The spiked-body mathematical model is extended to describe also the pulsations observed in forward facing cavities and it is shown that not only can the frequency be predicted but also the pressure time history of the pulsation phenomenon can be described with the accuracy needed to predict the experimentally observed time average effects. This implies that it should be possible to determine analytically what the impact of the flow pulsation is on the structural integrity of the nozzles on the jettisoned empty SRM-shells.