NDLI: Buoyancy effects in fully-modulated, turbulent diffusion flames

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Buoyancy effects in fully-modulated, turbulent diffusion flames

Content Provider	NASA Technical Reports Server (NTRS)
Author	Page, K. L. Stocker, D. P. Hermanson, J. C. Johari, H. Hegde, U. G. Ghaem-Maghami, E.
Copyright Year	2003
Description	Pulsed combustion appears to have the potential to provide for rapid fuel/air mixing, compact and economical combustors, and reduced exhaust emissions. The objective of this experiment (PuFF, for Pulsed-Fully Flames) is to increase the fundamental understanding of the fuel/air mixing and combustion behavior of pulsed, turbulent diffusion flames by conducting experiments in microgravity. In this research the fuel jet is fully-modulated (i.e., completely shut off between pulses) by an externally controlled valve system. This gives rise to drastic modification of the combustion and flow characteristics of flames, leading to enhanced fuel/air mixing compared to acoustically excited or partially-modulated jets. Normal-gravity experiments suggest that the fully-modulated technique also has the potential for producing turbulent jet flames significantly more compact than steady flames with no increase in exhaust emissions. The technique also simplifies the combustion process by avoiding the acoustic forcing generally present in pulsed combustors. Fundamental issues addressed in this experiment include the impact of buoyancy on the structure and flame length, temperatures, radiation, and emissions of fully-modulated flames.
File Size	204574
Page Count	4
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20040053583
Archival Resource Key	ark:/13960/t77t2nk4b
Language	English
Publisher Date	2003-08-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Thermodynamics Jet Mixing Flow Diffusion Flames Reaction Kinetics Buoyancy Flow Characteristics Combustion Chambers Exhaust Emission Turbulent Jets Turbulent Diffusion Fuel-air Ratio Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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