High subsonic cruise flight
Supersonic aircraft is firstly optimized for supersonic cruise performance. To achieve good transonic (i. c. high subsonic) cruise performance, it can be necessary to adapt the configuration to the different requirements The OFW performs this by adaption of sweep A symmetric config – uralion (like Concorde) can use flaps:
• leading edge flaps, to avoid leading edge separation; this is especially important for sharp (supersonic) leading edges.
• trailing edge flaps to control lift distribution for minimization of induced drag and load control during manocuvcrs; this requires a pitch control surface like a horizontal tail.
5.4.3 Low supersonic acceleration flight
During transonic (i. e. low supersonic) acceleration, wave drag is dominant Here it strongly depends on interference of the different parts of the aircraft: fuselage, wing, nacelles with engine stream tubes, tail. Near Mach I even small changes in Mach number produce strong changes in Mach angle (i. e. radiation direction); strong shocks prevail with considerable shock-boundary layer interaction. As a consequence, accurate drag prediction of the transonic interference phenomena requires nonlinear methods including ihe simulation of viscous effects.