NASA Dryden Flight Research Center has developed a flush airdata sensing (FADS) system on a sharp-nosed, wedge-shaped vehicle. This paper details the design and calibration of a real-time angle-ofattack estimation scheme developed to meet the onboard airdata measurement requirements for a research vehicle equipped with a supersonic-combustion ramjet engine. The FADS system has been designed to ...

Since mission profiles for airbreathing hypersonic vehicles such as the National Aero-Space Plane include single-stage-to-orbit requirements, real gas effects may become important with respect to engine performance. The effects of the decrease in the ratio of specific heats have been investigated in generic three-dimensional sidewall compression scramjet inlets with leading-edge sweep angles of...

The uninstalled performance of a full-scale scramjet operating over Mach 7 to 10 and altitudes 28 40 km was numerically analyzed by using high-fidelity Improved Delayed Detached Eddy Simulation (IDDES) with 125.10 million cells Dynamic Zone Flamelet model (DZFM) 21,294 flamelet zones. inviscid thrust can be well correlated dynamic pressure in the form gaussian function, whereas viscous drag inc...

Whether launching from the ground or in air, hypersonic vehicles need booster to accelerate a predetermined window, so as meet requirements of scramjet engine ignition. Therefore, there is interference suppression between boosters and under high dynamic pressure, which has become key technical problem that affects success flight tests, especially when aircraft statically unstable. A method vari...