Effects of thermal radiation on the acoustic response of solid propellants

AIAA Journal ◽  
1965 ◽  
Vol 3 (3) ◽  
pp. 418-426 ◽  
Author(s):  
R. H. CANTRELL ◽  
F. T. McCLURE ◽  
R. W. HART
Keyword(s):  
Thermal Radiation ◽  
Solid Propellants ◽  
Acoustic Response

Effect of surface reactions on acoustic response of solid propellants.

AIAA Journal ◽  
1967 ◽  
Vol 5 (9) ◽  
pp. 1718-1720 ◽  
Author(s):  
R. S. BROWN ◽  
R. J. MUZZY ◽  
M. E. STEINLE
Keyword(s):  
Surface Reactions ◽  
Solid Propellants ◽  
Acoustic Response ◽  
Effect Of Surface

ASYMPTOTIC STABILITY OF TRAVELING WAVES IN SOLID-PROPELLANT COMBUSTION UNDER THERMAL RADIATION

1999 ◽  
Vol 09 (09) ◽  
pp. 1279-1305 ◽  
Author(s):  
MAURIZIO VERRI
Keyword(s):  
Asymptotic Stability ◽  
Thermal Radiation ◽  
Burning Surface ◽  
Traveling Wave Solution ◽  
Combustion Model ◽  
Solid Propellants ◽  
Surface Mass ◽  
Existence And Stability ◽  
Time Periodic Solutions ◽  
The Stability

The steady burning stability of solid propellants under thermal radiation with volumetric absorption is investigated. The combustion model we are dealing with includes the classical assumptions of quasiplanarity of all spatial variations, quasisteadiness of the gas phase and surface reaction. However, the stability analysis requires neither assuming a specific pyrolysis law nor formulating a specific flame submodel as long as the surface mass production and heat feedback satisfy some general properties, which are indeed observed experimentally. The existence of a steady state (traveling wave) solution is proved, and a dispersion relationship for its asymptotic stability is derived by conveniently transforming the problem into an evolution equation in a Banach space. The fully opaque burning surface limit and the case of transparent burning surface with exponential volumetric absorption are examined in details. The resulting stability regions in a proper parameter space are given and, finally, existence and stability of bifurcating time-periodic solutions are discussed.

Characterizing the convective heat exchange with plastic shading nets under natural arid conditions

2019 ◽  
pp. 11-20
Author(s):  
Ahmed M Abdel-Ghanya ◽  
Ibrahim M Al-Helal
Keyword(s):  
Wind Speed ◽  
Thermal Radiation ◽  
Convective Heat ◽  
Convective Heat Transfer Coefficient ◽  
Convective Heat Exchange ◽  
Radiative Properties ◽  
Wooden Frame ◽  
Arid Conditions ◽  
Air Temperatures ◽  
Radiation Fluxes

Plastic nets are extensively used for shading purposes in arid regions such as in the Arabian Peninsula. Quantifying the convection exchange with shading net and understanding the mechanisms (free, mixed and forced) of convection are essential for analyzing energy exchange with shading nets. Unlike solar and thermal radiation, the convective energy, convective heat transfer coefficient and the nature of convection have never been theoretically estimated or experimentally measured for plastic nets under arid conditions. In this study, the convected heat exchanges with different plastic nets were quantified based on an energy balance applied to the nets under outdoor natural conditions. Therefore, each net was tacked onto a wooden frame, fixed horizontally at 1.5-m height over the floor. The downward and upward solar and thermal radiation fluxes were measured below and above each net on sunny days; also the wind speed over the net, and the net and air temperatures were measured, simultaneously. Nets with different porosities, colors and texture structures were used for the study. The short and long wave’s radiative properties of the nets were pre-determined in previous studies to be used. Re and Gr numbers were determined and used to characterize the convection mechanism over each net. The results showed that forced and mixed convection are the dominant modes existing over the nets during most of the day and night times. The nature of convection over nets depends mainly on the wind speed, net-air temperature difference and texture shape of the net rather than its color and its porosity.

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