NUMERICAL-ANALYSIS OF NOZZLE AND AFTERBODY FLOW OF HYPERSONIC TRANSPORT-SYSTEMS

Using an implicit Finite-Volume Navier-Stokes code, the flow field in a Single Expansion Ramp Nozzle (SERN) for a hypersonic aircraft is stu died. Comparisons between experimental data and CFD calculations for c ertain components of the integrated exhaust system (cold two-dimension al nozzle flow high temperature reacting three-dimensional combustion chamber flow, and two-dimensional nozzle flow with external flow) are presented. To show the sensitivity of the considered components to off -design operating conditions, comprehensive numerical studies have bee n carried out. For the determination of nozzle performance a detailed two-dimensional analysis from transonic to hypersonic flight Mach numb ers has been performed. A direct optimization method has been used to investigate the influence of the lower nozzle flap shape on the thrust vector.