Actions for The effects of gravity on wrinkled laminar flames [electronic resource].

Email RIS file
Bookmark
Report an Issue

The effects of gravity on wrinkled laminar flames [electronic resource].

Published
Washington, D.C. : United States. National Aeronautics and Space Administration, 1992.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
13 pages : digital, PDF file
Additional Creators
Lawrence Berkeley National Laboratory, United States. National Aeronautics and Space Administration, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online

Availability

I Want It
I Want It

Finding items...

Restrictions on Access
Free-to-read Unrestricted online access
Summary
Laminar and turbulent conical Bunsen type flames were used. The study compares results from normal gravity with the burner in an up-right orientation (+g), the burner inverted (-g), and in microgravity (μg) by using the NASA Lewis drop tower facility. The primary diagnostic is a laser schlieren system and some LDA measurements were taken for the +g condition to measure the flow field. The +g laminar flame experiences a large amount of instabilities and results in an unsteady flame tip; cause is torroidal vortex rolling up between products and stagnate surrounding air. Comparison between LDA measurements in reactants and schlieren images shows that velocity fluctuation are induced at the same frequency as the roll up vortices are formed. This pumping of the reactant stream by the product/air interface instability in the +g case is also observed in the turbulent flames. In the -g arrangement the product/air interface is stable so there is no large pumping of the flame tip. At low flow rates the -g flames have flattened tips, but at higher flow rates they become conical in shape. When both flames. appear conical, the -g flames are longer for the same flow rate. In μg the larger instabilities in the flame no longer exist as the product/air interface is believed to become stable. The laminar flames in μg still show small instabilities over the entire flame.
Report Numbers
E 1.99:lbl--32927
E 1.99: conf-9210213--1
conf-9210213--1
lbl--32927
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
09/01/1992.
"lbl--32927"
" conf-9210213--1"
"DE93002572"
": Contract C-32000-R"
1992 Combustion Institute fall meeting of the western states section,Berkeley, CA (United States),12-13 Oct 1992.
Cheng, R.K.; Zhou, L.; Kostiuk, L.W.
Funding Information
AC03-76SF00098
View MARC record | catkey: 14114639