Experimental investigation on the heat fluxes generated by AP/HTPB solid propellant flames

This article describes an experimental investigation into the heat fluxes generated by the combustion of AP/HTPB solid propellant samples inside 1‑MPa pressurized combustion chambers. Fluxmeters developed at ONERA and recently improved were used to measure the local heat flux densities. Two kind of...

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Bibliographic Details
Published in:Combustion and flame 2021-06, Vol.228, p.89-98
Main Authors: Boulal, Stéphane, Devillers, Robin W., Lestrade, Jean-Yves, Lamet, Jean-Michel, Corato, Christophe, Henry, Didier, Dupays, Joël
Format: Article
Language:English
Subjects:
Combustion chambers
Engineering Sciences
Equivalence
Fluxmeter
Heat flux
Heat transfer
HTPB propellants
IR radiation
Magnetic measurement
Measurement methods
Measuring instruments
Mechanics
Radiance
Reactive fluid environment
Sapphire
Solid propellant flame
Solid propellants
Solid rocket motor
Thermics
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Summary:This article describes an experimental investigation into the heat fluxes generated by the combustion of AP/HTPB solid propellant samples inside 1‑MPa pressurized combustion chambers. Fluxmeters developed at ONERA and recently improved were used to measure the local heat flux densities. Two kind of fluxmeters were used: total fluxmeters for which the convective and the radiative components are measured and radiative fluxmeters for which the convective component is suppressed by the use of a sapphire window mounted on top of the fluxmeter. Additionally, the flame was visualized by a narrow-band filtered IR camera which provided quantitative and spatially resolved radiance field. From the IR camera recordings, a radiative heat flux equivalent to that measured by the radiative fluxmeters was constructed by means of the integration over the fluxmeters’ collection volumes of the spectrally equivalent radiance. A satisfactory agreement is thus found between the two radiative heat flux measurement methods.
ISSN:0010-2180
1556-2921
DOI:10.1016/j.combustflame.2021.01.030