Browsing Aeronautics and astronautics by Issue Date
Now showing items 1-20 of 314
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Finite element analysis of propagating interface cracks in composites
(1986)A complex variable formulation has been developed to describe the near-field state of stresses and displacements for a propagating crack along the interface of two dissimilar anisotropic materials. It is shown that the ... -
Numerical simulation of unsteady hypersonic chemically reacting flow
(1995)The goal of this research is to develop and evaluate a new algorithm for the numerical solution of the axisymmetric Navier-Stokes equations for unsteady hypersonic flow with chemically reacting gas species. The LU-SGS ... -
Analytic shape sensitivities and approximations of local and global airframe buckling constraints
(1997)An examination of available shell finite elements suitable for buckling analysis of thin walled airframe structures leads to the selection of a simple, accurate, design-oriented element, which is, then, used with slight ... -
Durability of polymeric composites after elevated temperature aging
(1997)The Compression After Impact (CAI) strength of polymeric composites after long term elevated temperature aging is studied. Aging temperatures range from 149$\sp\circ$C to 204$\sp\circ$C (300$\sp\circ$F to 400$\sp\circ$F). ... -
Interaction of an accelerated FRC in a transverse magnetic field
(1998)The interaction and penetration of an accelerated FRC into a transverse magnetic field is studied for Tokamak refueling purposes. FRC penetration and interaction in the transverse magnetic field chamber is observed using ... -
Wake closure conditions in plug nozzle flowfields
(1999)The aerospike, of plug, nozzle is being proposed for future space launch vehicle applications. The design of the nozzle involves complex wake structures that directly affect engine performance. In particular, the closed ... -
Fluid dynamics of the shock wave reactor
(2000)High commercial incentives have driven conventional olefin production technologies to near their material limits, leaving the possibility of further efficiency improvements only in the development of entirely new techniques. ... -
The star thrust experiment, rotating magnetic field current drive in the field reversed configuration
(2001)The Star Thrust Experiment (STX) has formed and sustained the Field Reversed Configuration (FRC) with a Rotating Magnetic Field (RMF) operated at a strength of 25 G and a frequency of 350 kHz. The RMF was generated with ... -
Paramagnetic spin-up of a field reversed configuration with rotating magnetic field current drive
(2003)A transverse Rotating Magnetic Field (RMF) can drive toroidal current and sustain the poloidal flux of a Field Reversed Configuration (FRC) through the application of a 〈vz x Br〉 Lorentz force on the electrons, where vz ... -
A study of jet exhaust-wing interaction
(2005)Non-steady loading of surfaces embedded in a two-dimensional shear-layer is studied as a first step in understanding and predicting the forces generated in aircraft exhaust-jet and wing interactions. It is hypothesized ... -
The Electrodeless Lorentz Force Thruster Experiment
(2010-03)The Electrodeless Lorentz Force (ELF) thruster is a novel type of plasma thruster, which utilizes Rotating Magnetic Field current drive within a diverging magnetic field to form, accelerate, and eject a Field Reversed ... -
Numerical Methods for 3-dimensional Magnetic Confinement Configurations using Two-Fluid Plasma Equations
(UMI, 2010-06-24)The 5-moment two-fluid plasma model uses Euler equations to describe the ion and electron fluids, and Maxwell's equations to describe the electric and magnetic fields. Two-fluid physics becomes significant when the ... -
Development of a Vision-Based Particle Tracking Velocimetry Method and Post-Processing of Scattered Velocity Data
(2012-08-10)In this thesis, a new vision-based hybrid particle tracking velocimetry (VB-PTV) technique is described and methods of processing randomly scattered velocity data investigated. The VB-PTV technique uses a feature matching ... -
Experimental and Analytical Study of Mode II Interlaminar Failure of Bolted and Bonded Composite Structures
(2012-08-10)The capability of a fastener to arrest and stabilize pure Mode II interlaminar failure in composite structures has been investigated both experimentally and analytically. A novel pure Mode II three-beam axially loaded ... -
Development and Testing of Temperature-sensitive Beads for Simultaneous Thermometry and Velocimetry
(2012-08-10)Temperature-sensitive beads (TSBs) have been developed with promising characteristics for application to complex flows, giving the capability for flow visualization via simultaneous full-field thermometry and velocimetry. ... -
A Parametric Analysis of the Aerodynamic Characteristics of Volleyballs in Turbulent Flow
(2012-08-10)A wind tunnel experiment was conducted to compare the flight path characteristics and drag of current models of volleyballs. An open circuit low speed wind tunnel was primarily used to gather lift and drag data on multiple ... -
Flame Structure and Emissions of Strongly-Pulsed Turbulent Diffusion Flames with Swirl
(2012-08-10)This work studies the turbulent flame structure, the reaction-zone structure and the exhaust emissions of strongly-pulsed, non-premixed flames with co-flow swirl. The fuel injection is controlled by strongly-pulsing the ... -
Effects of Density Control on Internal Plasma Dynamics and Current Drive in HIT-SI
(2012-09-13)The Helicity Injected Torus with Steady Inductive Helicity Injection (HIT-SI) experiment investigates a method of current drive and spheromak formation through constant inductive helicity injection into a confinement volume ... -
Shear-sensitive polymer dispersed liquid crystal
(2012-09-13)Polymer dispersed liquid crystal has been developed as a shear stress sensor, showing a great signal-to-noise ratio with a high temporal bandwidth. Traditional shear sensing liquid crystal techniques are known to be ... -
Comparison of Electrode Configurations on ZaP: Investigation of Heating Mechanisms in a Flow Z-Pinch
(2013-02-25)The ZaP Flow Z-Pinch is a basic plasma physics experiment that investigates the effect of sheared axial flows Z-pinch stability. Two modifications are made: 1)~Installation of a perforated conducting wall to evaluate the ...