NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Effects of Gravity on Sheared and Nonsheared Turbulent Nonpremixed FlamesThe present numerical study is concerned with the fundamental physics of the multi-way interaction between turbulence, chemical reaction and buoyancy in a nonpremixed flame. The method of direct numerical simulation (DNS) is used to solve the instantaneous three-dimensional governing equations (continuity, Navier-Stokes, species mass fractions and energy) under the zero-Mach number assumption. Because of the present supercomputer limitations, we consider two simple flow geometries, namely an initially uniform flow without shear (equivalent to grid-generated turbulence) and an initially uniform shear flow. In each flow, the fuel and oxidant initially exist as two separate streams. As the reactants mix, chemical reaction takes place and exothermic energy is released causing variations in density. In the presence of a gravity field, the spatial and temporal distributions of the induced buoyancy forces depend on the local density gradients and the direction of the gravitational acceleration.
Document ID
19970020575
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Elghobashi, Said
(California Univ. Irvine, CA United States)
Boratav, Olus
(California Univ. Irvine, CA United States)
Zhong, Rong-Bin
(California Univ. Irvine, CA United States)
Date Acquired
August 17, 2013
Publication Date
May 1, 1997
Publication Information
Publication: Fourth International Microgravity Combustion Workshop
Subject Category
Inorganic And Physical Chemistry
Accession Number
97N21848
Funding Number(s)
CONTRACT_GRANT: NAG3-1605
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Document Inquiry

Available Downloads

There are no available downloads for this record.
No Preview Available