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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.142 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.750
pages 725-732

CRITICAL ASSESSMENT OF THE MICROWAVE METHOD FOR MEASURING STEADY-STATE AND TRANSIENT REGRESSION RATES OF SOLIDS

Vladimir Zarko
ICKC SB RAS
V. V. Perov
Institute of Chemical Kinetics and Combustion, Russian Academy of Sciences, Novosibirsk 630090, Russia
Vladimir N. Simonenko
Institute of Chemical Kinetics and Combustion, Russian Academy of Sciences, Novosibirsk 630090, Russia

RÉSUMÉ

It is known that the microwave technique provides the highest spatial resolution when determining displacement of the burning (regressing) surface. This gives promise for developing an effective direct method for measuring the transient regression rate of solids. However, there are serious limitations to the method due to attenuation and secondary reflections of the microwave energy. Unfortunately, despite several decades of development, information is very scarce in the open literature on the technical possibilities and correct use of the microwave method. In the present paper, the potential sources of errors due to non-planar (rough) burning surface, scatter of electromagnetic wave on metallic particles, attenuation of radiation in finite-length propellant samples, and reflection of radiation from the waveguide elements and high-pressure vessel walls are analyzed. Some methods for diminishing and eliminating the disturbing factors are suggested. Recommendations for optimization of parameters of the propellant samples and microwave measurement system are discussed.


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