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System Identification and Active Control of a Turbulent Boundary Layer
(Aerospace Computational Design Lab, Dept. of Aeronautics & Astronautics, Massachusetts Institute of Technology, 1997-06)
An experimental investigation is made into the active control of the near-wall region of a turbulent boundary layer using a linear control scheme. System identification in the boundary layer provides optimal transfer ...
Aerodynamic Optimization Based on the Euler and Navier-Stokes Equations using Unstructured Grids
(Aerospace Computational Design Laboratory, Dept. of Aeronautics & Astronautics, Massachusetts Institute of Technology, 1998-06)
The overall problem area addressed is that of efficient aerodynamic shape design through the use of computational fluid dynamics (CFD). A method is presented for performing optimization including modal inverse design and ...
Small-Scale Forcing of a Turbulent Boundary Layer
(Aerospace Computational Design Laboratory, Dept. of Aeronautics & Astronautics, Massachusetts Institute of Technology, 1997-01)
In order to understand the effect of small scale forcing on turbulent flows and its implications on control, an experimental investigation is made into the forcing of the inertial scales in the wall region of a turbulent ...
Integral methods for three-dimensional boundary layers
(Aerospace Computational Design Laboratory, Dept. of Aeronautics & Astronautics, Massachusetts Institute of Technology, 1998-02)
Several distinct issues important in integral approximations of the three-dimensional boundary-layer equations are addressed. One of these is the requirement, justified on the basis of the nature of the full differential ...
Measurement of the Mass Flow and Tangential Momentum Accommodation Coefficient in Silicon Micromachined Channels
(Aerospace Computational Design Laboratory, Dept. of Aeronautics & Astronautics, Massachusetts Institute of Technology, 1997-01)
An analytic and experimental investigation into gaseous
flow with slight rarefaction through long microchannels
is undertaken in an attempt to obtain values of the Tangential Momentum Accommodation Coefficient
(TMAC) ...
Evaluation of forecasting techniques for short-term demand of air transportation
([Cambridge, Mass. : Massachusetts Institute of Technology, Dept. of Aeronautics & Astronautics], Flight Transportation Laboratory, [1995], 1995)
Forecasting is arguably the most critical component of airline management. Essentially, airlines forecast demand to plan the supply of services to respond to that demand. Forecasts of short-term demand facilitate tactical ...
Revenue impacts of airline yield management
([Cambridge, Mass. : Massachusetts Institute of Technology, Dept. of Aeronautics & Astronautics, Flight Transportation Laboratory, 1992], 1992)
In the highly competitive airline industry today, Yield or Revenue Management is extremely important to the survival of any carrier. Since fares are generally matched by all carriers to be competitive, the ability of an ...
A numerical analysis of 3-D inviscid stator/rotor interactions using non-reflecting boundary conditions
(Cambridge, Mass. : Gas Turbine Laboratory, Massachusetts Institute of Technology, [1992], 1992)
This dissertation presents a method for the computation of three-dimensional inviscid, transonic steady and unsteady flows, primarily in axial flow turbines. The work is divided into two major contributions. The first is ...
Active stabilization of rotating stall and surge in a transonic single stage axial compressor
(Cambridge, Mass. : Gas Turbine Laboratory, Massachusetts Institute of Technology, 1997, 1997)
Rotating stall and surge have been stabilized in a transonic single-stage axial compressor using active feedback control. The control strategy is to sense upstream wall static pressure patterns and feed back the measured ...
The effect of upstream rotor vortical disturbances on the time-average performance of axial compressor stators
(Cambridge, Mass. : Gas Turbine Laboratory, Massachusetts Institute of Technology, 1997, 1997)
Time-accurate Reynolds-averaged Navier-Stokes simulations have been carried out to investigate the impact of upstream rotor wakes and tip leakage vortices on the loss of a compressor stator. The objective is to (1) identify ...