A m ultiaxis thrust-vectoring nozzle designed to have equal ow-turning capability in pitch and yaw was conceived and experimentally tested for internal static performance at Langley Research Center. The cruciform-shaped, convergent-divergent nozzle turned the ow for thrust vectoring by deeecting the divergent surfaces of the nozzle, called aps. Methods for eliminating physical interference betw...

This paper describes an approach for controlling the attitude of statically unsable thrust-levitated vehicles in hover or slow translation. The large thrust vector that characterizes such vehicles can be modulated to provide control forces and moments to the airframe, but such modulation is accompanied by significant unsteady flow effects. These effects are difficult to model, and can compromis...

A system for cold ow testing of an aerospike nozzle has been developed in an e ort to examine the e ectiveness of aerodynamic thrust vectoring and truncated nozzle base bleed. These tests are designed to produce results that will support the design of a system for hot ow testing of the same technologies. Design of a nozzle suitable for testing with reasonable cold-gas mass ow rates and measurea...

Aerodynamic Thrust Vectoring for Attitude Control of a Vertically Thrusting Jet Engine

Results from numerical and coldow experimental investigations of aerodynamic thrust vectoring on a small-scale aerospike thruster are presented. Thrust vectoring was created by the injection of a secondary uid into the primary ow eld normal to the nozzle axis. The experimental aerospike nozzle was truncated at 57% of its full theoretical length. Data derived from coldow thrust vectoring tests w...

In this paper a geometric approach to the trajectory tracking control of Unmanned Aerial Vehicles with thrust vectoring capabilities is proposed. The control design is suitable for aerial systems that allow to effectively decouple position and orientation tracking tasks. The control problem is developed within the framework of geometric control theory on the group of rigid displacements SE (3),...

The concept of thrust-based control without the employment thrust-vectoring (TVC), already introduced in a previous work by authors, is further developed conjunction with an appropriate suite, tasked both artificial stabilization and beam-tracking navigation functions. In paper, fully non-linear mathematical model employed for testing controllers virtual environment outlined. Then comparative a...

A modeling and experimental study was performed to examine the jet attachment process, which can develop during the fluidic thrust vector control of subsonic and supersonic jets. Experiments performed in rectangular jets up to Mach 1.4 revealed that continuous control of jet exhaust is possible with secondary mass flow rates of the order of 1% of the primary jet mass. Under certain operating co...

Compared to a variety of mechanical vectoring nozzles, fluidic nozzles possess more research value nowadays. The dual throat nozzle is gradually developing into an outstanding technology handle supersonic and hypersonic aircraft deflections. Three-dimensional, steady, compressible, viscous flows in rectangular are numerically investigated by resolving Reynolds-averaged Navier-Stokes equations s...