Browsing Faculty Works, Department of Aerospace and Ocean Engineering by Issue Date
Now showing items 1-20 of 37
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Simple Model of Convection-Diffusion Coupling Near Flames
(AIP Publishing, 1976)A Couette-flame sheet flow model is analyzed to study combined indraft convection_thermal diffusion effects on oxygen distribution near intense fires. These effects enhance the local oxygen concentration, thermal diffusion ... -
Final Report: Second Forum on Space Structures
(Virginia Tech, 1984-06)This document consists of summaries of presentations and discussions from the Forum, which was a meeting for investigators of structural dynamics and control issues in large space structures technology held 11-13 June 1984. ... -
Closed-form approximations and series representations for partially saturated ocean acoustic processes
(Acoustical Society of America, 1988-04-01)An approximate, closed-form expression for the value of the integral encountered in the calculation of the probability density function (PDF) of the envelope of a partially saturated ocean acoustic process is obtained. ... -
Diode array velocimeter
(United States Patent and Trademark Office, 1996-05-14)A velocimeter includes a light source for emitting a light beam through a flow, the flow including particles for scattering light as the light beam passes through the flow, a focussing device for focussing the scattered ... -
The Last Western Flyer: The Western Auto Century
(2004)A treasure trove of pictures and history, The Last Western Flyer chronicles one of the most successful small town franchise operations in 20th Century America, Western Auto. It grew from humble beginnings as a penny mailer ... -
Octant analysis based structural relations for three-dimensional turbulent boundary layers
(American Institute of Physics, 2006-02-01)A flow structure based triple-product correlation model developed by Nagano and Tagawa [J. Fluid Mech. 215, 639 (1990)] has been expanded to three-dimensional turbulent flows. Three-dimensional turbulent boundary layer ... -
Electric Propulsion Plume Simulations Using Parallel Computer
(Hindawi, 2007-01-01)A parallel, three-dimensional electrostatic PIC code is developed for large-scale electric propulsion simulations using parallel supercomputers. This code uses a newly developed immersed-finite-element particle-in-cell ... -
Detailed flow physics of the supersonic jet interaction flow field
(American Institute of Physics, 2009-04-01)The supersonic jet interaction flow field generated by a sonic circular jet with a pressure ratio of 532 exhausting into a turbulent MACH 4.0 cross flow over a flat plate was investigated using numerical simulations. The ... -
Prevention of Pressure Oscillations in Modeling a Cavitating Acoustic Fluid
(Hindawi, 2010-01-01)Cavitation effects play an important role in the UNDEX loading of a structure. For far-field UNDEX, the structural loading is affected by the formation of local and bulk cavitation regions, and the pressure pulses resulting ... -
A closed-form method for calculating the angular distribution of multiply scattered photons through isotropic turbid slabs
(Optical Society of America, 2011-11-01)This paper develops a method for calculating the angular distribution (AD) of multiply scattered photons through isotropic turbid slabs. Extension to anisotropic scattering is also discussed. Previous studies have recognized ... -
Simultaneous measurements of multiple flow parameters for scramjet characterization using tunable diode-laser sensors
(Optical Society of America, 2011-12-01)This paper reports the simultaneous measurements of multiple flow parameters in a scramjet facility operating at a nominal Mach number of 2.5 using a sensing system based on tunable diode-laser absorption spectroscopy ... -
Scaling Law for Photon Transmission through Optically Turbid Slabs Based on Random Walk Theory
(MDPI, 2012-03-01)Past work has demonstrated the value of a random walk theory (RWT) to solve multiple-scattering problems arising in numerous contexts. This paper's goal is to investigate the application range of the RWT using Monte Carlo ... -
Method to correct the distortion caused by amplified stimulated emission as motivated by LIF-based flow diagnostics
(Optical Society of America, 2012-04-01)Amplified stimulated emission (ASE) represents a significant issue in two-photon laser-induced fluorescence (TPLIF). The ASE effects are nonlinear and nonlocal, i.e., the ASE effects distort the LIF signal nonlinearly, and ... -
Uncertainty in velocity measurement based on diode-laser absorption in nonuniform flows
(Optical Society of America, 2012-07-01)This work investigates the error caused by nonuniformities along the line-of-sight in velocity measurement using tunable diode-laser absorption spectroscopy (TDLAS). Past work has demonstrated TDLAS as an attractive ... -
50-kHz-rate 2D imaging of temperature and H2O concentration at the exhaust plane of a J85 engine using hyperspectral tomography
(Optical Society of America, 2013-01-01)This paper describes a novel laser diagnostic and its demonstration in a practical aero-propulsion engine (General Electric J85). The diagnostic technique, named hyperspectral tomography (HT), enables simultaneous 2-dimensional ... -
50-kHz-rate 2D imaging of temperature and H2O concentration at the exhaust plane of a J85 engine using hyperspectral tomography
(Optics Express, 2013-01-14)This paper describes a novel laser diagnostic and its demonstration in a practical aero propulsion engine (General Electric J85). The diagnostic technique, named hyperspectral tomography (HT), enables simultaneous 2-dimensional ... -
Numerical and experimental validation of a three-dimensional combustion diagnostic based on tomographic chemiluminescence
(Optical Society of America, 2013-03-01)Three-dimensional (3D) measurements are highly desirable both for fundamental combustion research and practical monitoring and control of combustion systems. This work discusses a 3D diagnostic based on tomographic ... -
Numerical and experimental validation of a three-dimensional combustion diagnostic based on tomographic chemiluminescence
(Optics Express, 2013-03-25)Three-dimensional (3D) measurements are highly desirable both for fundamental combustion research and practical monitoring and control of combustion systems. This work discusses a 3D diagnostic based on tomographic ... -
Practical aspects of implementing three-dimensional tomography inversion for volumetric flame imaging
(Optical Society of America, 2013-11-01)Instantaneous three-dimensional (3D) measurements have been long desired to resolve the spatial structures of turbulent flows and flame. Previous efforts have demonstrated tomography as a promising technique to enable such ... -
Volumetric imaging of turbulent reactive flows at kHz based on computed tomography
(OSA Publishing, 2014-02-21)Diagnostics with three-dimensional (3D) spatial resolution and rapid temporal resolution have been long desired to resolve the complicated turbulence-chemistry interactions. This paper describes a method based on based on ...
