Flow Physics and Controls Branch

... Bobby L. Berrier* and Brian G. Allan† NASA Langley Research Center Hampton, Virginia 23681-2199 ABSTRACT A new high Reynolds number test capability for boundary layer ingesting inlets has been developed for the NASA Langley Research Center 0.3-Meter Transonic ...

... 3. Callaghan, JT, and Liebeck, RH, “Some Thoughts on the Design of Subsonic Transport Aircraft for the 21st Century,” Cockpit, Dec. 1990, pp. 5-13. 4. Liebeck, RH, Page, MA, Rawdon, BK, “Evolution of the Revolutionary Blended-Wing-Body,” Transportation Beyond 2000 ...

Numerical simulations of a two-dimensional airfoil, controlled by an applied moment in pitch and an airfoil controlled by jets, were investigated. These simulations couple the Reynolds-averaged Navier- Stokes equations and Euler's equations of rigid body motion, with an active control system. Controllers for both systems were designed to track altitude commands and were evaluated by simulating a closed- loop altitude

Numerical simulation of a two-dimensional airfoil controlled by jets near the trailing edge is investigated. This simulation couples the Reynolds-averaged Navier Stokes equations with Euler’s equations of rigid-body motion and an active control system. Robust control design techniques were used to develop a controller for tracking altitude commands. Simulation of the controller with the coupled system showed good tracking performance for a step input command in altitude. However, the linear model was unable to capture the nonlinear nature of this system producing mild oscillations in the attitude, pitch rate, and vertical velocity of the airfoil.