Scientific and Technical Aerospace Reports Volume 39 April 6, 2001

than 3.0% for temperatures below 90 K; predictions at 90 K differ from experiment by no more than 4.11%. These results seem
to suggest that our method for determining parameters for an interaction potential is also applicable to simple molecular systems.
DTIC
Molecular Dynamics; Oxygen; Computerized Simulation; Liquid Phases; Molecular Interactions
20010025062 Illinois Univ., Urbana, IL USA
Modeling of Physical Processes Final Report, 1 Mar 1996-31 May 1999
Buchmaster,, Illinois Univ., USA; May 1999; 6p; In English
Contract(s)/Grant(s): F49620-96-1-0031
Report No.(s): AD-A384825; AFRL-SR-BL-TR-00-0649; No Copyright; Avail: CASI; A01, Microfiche; A02, Hardcopy
We examine the geometry of diffusion flames generated by the burning of a heterogeneous solid propellant, using a simple
model designed to provide qualitative insights. In the fast chemistry limit a strategy is used which has its roots in Burke and Schumann’s
1928 study of diffusion flames, albeit with different boundary conditions. This shows that the stoichiometric level surface
(SLS) intersects the propellant surface at a point displaced from the fuel/oxidizer interface, and the variations of this displacement
with Peclet number are discussed. We show that for model sandwich propellants, or their axisymmetric counterpart, the geometry
of the SLS when the core is oxidizer is quite different for the geometry of the SLS when the core is fi approx. el. Also, it is much
easier to quench the flame on an oxidizer core, by reducing the Peclet number, than it is to quench the flame on a fuel core. When
finite chemistry effects are accounted for, the flame only occupies a portion of the SLS, and there is a leading edge structure in
which premixing plays a role. Enhancement of the burning rate due to premixing is identified, but a well-defined tribrachial structure
is not observed. We show how a sharp reduction in pressure can lead to a detachment of the flame from the SLS, with subsequent
quenching as it is swept down stream.
DTIC
Solid Propellant Rocket Engines; Combustion; Diffusion Flames; Premixed Flames; Mathematical Models
20010025073 Naval Postgraduate School, Monterey, CA USA
Propagation of Fire Generated Smoke and Heat Transfer in Shipboard Spaces with a Heat Source
Vegara, Billy J.; Sep. 2000; 68p; In English
Report No.(s): AD-A384600; No Copyright; Avail: CASI; A04, Hardcopy; A01, Microfiche
The propagation of fire generated smoke and heat transfer into a shipboard space has been computationally modeled using
a commercial code generated by Computational Fluid Dynamics Research Corporation (CFDRC). The space modeled was
1-158-1-L of an Arleigh Burke Class Flight IIA Destroyer. Three smoke and heat scenarios are applied to the space. For all three
scenarios, the inlet used is the forward, inboard watertight door. Smoke enters the upper half of the door, while air enters through
the bottom half. The temperature of the inlet fluids is altered to observe its effect on propagation. In the last scenario, the floor
temperature is isothermally held at 1200 K to simulate a fire in the space below. The results of this scenario shows that extreme
temperatures of adjacent spaces has minimal effect on propagation. The overall goal of this study is to show how computational
methods can be used to model propagation of smoke in shipboard spaces.
DTIC
Smoke; Flame Propagation; Heat Transfer; Heat Sources; Isothermal Processes
20010025815 Sandia National Labs., Albuquerque, NM USA
Diesel Combustion Collaboratory: Combustion Researchers Collaborating over the Internet
Pancerella, C. M.; Rahn, L. A.; Yang, C.; Feb. 01, 2000; 19p; In English
Report No.(s): DE00-758327; SAND99-8749; No Copyright; Avail: Department of Energy Information Bridge
The Diesel Combustion Collaborator (DCC) is a pilot project to develop and deploy collaborative technologies to combustion
researchers distributed throughout the DOE national laboratories, academia, and industry. The result is a problem-solving environment
for combustion research. Researchers collaborate over the Internet using DCC tools, which include: a distributed execution
management system for running combustion models on widely distributed computers, including supercomputers;
web-accessible data archiving capabilities for sharing graphical experimental or modeling data; electronic notebooks and shared
workspaces for facilitating collaboration; visualization of combustion data; and video-conferencing and data-conferencing
among researchers at remote sites. Security is a key aspect of the collaborative tools. In many cases, the authors have integrated
these tools to allow data, including large combustion data sets, to flow seamlessly, for example, from modeling tools to data
archives. In this paper the authors describe the work of a larger collaborative effort to design, implement and deploy the DCC.
NTIS
Combustion Physics; Problem Solving; Diesel Engines; Research Projects
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