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New Paper in AIAA Journal Published: Local Burning Rates and Heat Flux for Forced Flow Boundary-Layer Diffusion Flames

August 2, 2015 by admin

Building on our previous work with buoyant flows, this new paper details measurements of heat fluxes and local burning rates over liquid fuel wicks under forced flow. These laminar flames are interesting from a theoretical viewpoint, where the classical Emmons’ solution typically describes them well. The influence of buoyancy, described by the Richardson Number, can be quantified here where two separate attachment points form and traditional solutions start to fail. The detail of the measurements provided will hopefully aid modeling efforts in the future. Our next step is to move these measurement techniques to more practical fuels and regimes (turbulent).

Ajay V. Singh and Michael J. Gollner.  “Local Burning Rates and Heat Flux for Forced Flow Boundary-Layer Diffusion Flames”. ,
doi: 10.2514/1.J054283

Abstract:
A methodology based on the Reynolds analogy was developed earlier that allowed for the estimation of local mass burning rates and heat fluxes in free-convection laminar boundary-layer diffusion flames. In this study, the relationship was examined in a forced-convective environment using methanol as a liquid fuel. The gas-phase temperature profiles across the laminar boundary layer with a methanol diffusion flame established over it were measured with the freestream air flowing parallel to the condensed fuel surface. Local and averaged mass burning rates were measured along with shear stresses at the fuel surface. The fuel consumption rate and flame lengths were observed to increase monotonically with an increase in the freestream velocity. Although the initial study was taken in the laminar regime, further extensions of the technique could be applicable to turbulent boundary-layer combustion in propulsion-oriented research.
Read More: http://arc.aiaa.org/doi/abs/10.2514/1.J054283
Download Pre-Print: Pre-Print PDF

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27 Mar

Smoke flow produced by smouldering combustion

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24 Mar

Units being released.

Sounds like early indications show a lithium ion battery responsible. (Scooter battery most likely)

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22 Mar

Beautiful work by ⁦@Xiaoyu_Ju⁩ & Yuji Nakamura: New Technique Generates Non-Flickering Flames at Normal Gravity and Atmospheric Pressure. I’ve watched this flickering flame development for years and the results have been fascinating

APS Physics

New Technique Generates Non-Flickering Flames at Normal Gravity and Atmospheric Pressure

Flickering flames are more unstable. Researchers have come up with a novel way to keep them still.

www.aps.org

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