Burn rate (chemistry)

About: Burn rate (chemistry) is a research topic. Over the lifetime, 847 publications have been published within this topic receiving 8908 citations. The topic is also known as: Burning rate.

Acceleration effects in solid propellant rocket motors

Abstract: The performance variations due to acceleration loads imposed on spinning solid propellant rocket motors are investigated. The four potentially most significant modes of acceleration-induced phenomena are identified from a study of the literature and modeled. The four modes are a mechanical mode which deals with deformations of the propellant and case: a thermodynamic mode which covers acceleration-induced combustion phenomena; a stress mode which covers the stressed propellant's effect on burn rate; and a gas dynamic mode which deals with changes in gas flow in the chamber and through the nozzle. Simplified models of each mode are developed or taken from the literature and are added to an internal ballistics evaluation computer program. The resulting analysis is the first to include all of the modes. In order to do this an original analysis of the mechanical and stress modes was necessary. However, the analysis shows that the stress mode is not important for the circular perforated grains studied. The other effects are shown to have a significant influence on solid rocket motor performance. The magnitude of the different mode effects are such that one may not be ignored over the others as has been done in the past. The results of the analysis are compared to published rocket motor data. The comparisons indicate an erosive burning effect that is a function of spin rate. A qualitative explanation of the erosive effect is presented.

Method of improving the burn rate and ignitability of aluminium fuel particles and aluminium fuel so modified

Abstract: A method of improving the burn rate and ignitability of aluminium fuel particles, and a thus modified aluminium fuel for use in propellant and explosive compositions and pyrotechnic charges Aluminium fuel particles are treated with an aqueous solution of hydrofluoric acid and a fluoride and/or complex fluoride salt of an alkali metal and/or alkaline earth metal to form a surface layer of a fluoride complex bound to the aluminium fuel particle

Investigation of the combustion process of gel propellants

Abstract: The trend today in high energy long storage rocket fuel and propellants research is to develop combustion systems which introduce the use of gel fuels and propellants. The idea stems from the fact that the addition of gelling agents and/or metallized additives to the liquid fuels enhances significantly the performance, density and specific impulse of liquid fuels. Understanding the evaporation and combustion process of single droplets of gel fuels is the first basic step to predict their behavior in the future combustion chambers. An experimental investigation of the evaporation and combustion phenomena of gelled fuel droplets is presented using a sophisticated state of the art computerized video system. The burning rate of the droplet was measured and the combustion process was viewed and investigated closely. A parametric investigation was conducted to evaluate the effect of the chamber pressure and the oxygen mass fraction on the droplet burning rate. The results indicate that gels burn at lower burning rates than liquids and ignition is more difficult.

Direct-fired heater

Abstract: A combustion system for a portable forced air heater having two frusta-conical sections attached to a circular burner tube, wherein each frusta-conical section has pre-determined vent hole patterns that allow the gas heater to have a variable burn rate.