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.

Electrothermal-Chemical (ETC) Propulsion with High Loading Density Charges.

Abstract: : This report investigates and quantifies the requirements for increasing performance (muzzle kinetic energy) in existing high performance (tank) gun systems utilizing solid propellants. Factors studied include propelling charge mass or loading density, propellant specific energy, grain geometry, and the use of electrothermal-chemical concepts. Results indicate that significant increases in performance require not only increased system energy but, more importantly, propellant combustion control in terms of the mass generation rate to operate near "ideal" gun performance. Specific requirements and approaches (e.g., propellant burn rate modification by plasma radiative heating) to obtain the "ideal" gun performance are discussed. Pertinent experimental results are also included.

Solid propellant formulations and methods and devices employing the same for the destruction of airborne biological and/or chemical agents

Abstract: High temperature incendiary (HTI) devices and methods destroy biological and/or chemical agents. Preferably, such HTI devices include dual modal propellant compositions having low burn rate propellant particles dispersed in a matrix of a high burn rate propellant. Most preferably, the HTI device includes a casing which contains the dual modal propellant and a nozzle through which combustion gases generated by the ignited high burn rate propellant may be discharged thereby entraining ignited particles of the low burn rate propellant. In use, therefore, the high burn rate propellant will be ignited using a conventional igniter thereby generating combustion gases which are expelled through the nozzle of the HTI device. As the ignition face of the propellant composition regresses, the low burn rate particles will similarly become ignited. Since the low burn rate particles burn at a lesser rate as compared to the high burn rate propellant in which such particles are dispersed, the ignited particles per se will be expelled through the nozzle and will therefore continue to burn in the ambient environment. Such continued burning of the particles will thereby be sufficient to destroy chemical and/or biological agents that may be present in the ambient environment.

Active binder propellants incorporating burning rate catalysts

Abstract: New propellant compositions characterized by the addition of certain simple salts and double salts, both metallic and non-metallic, having the B10 H10 -2 anion in common, are taught herein to function as a class of burn rate catalysts, and not as fuels, when combined with a category of propellants known as nitrocellulose base propellants. Additionally, unique forms of the simple salts, created by coprecipitation of the simple salt with an oxidizer, constitute a third class of burn rate enhancers herein.

Fast burning propellants

Abstract: A solid or semisolid propellant comprising grains of propellant or propellant components bonded together so as to create voids within the propellant volume, said grains bonded together with sufficient strength to substantially delay the fluidization of the propellant by the onset of Taylor unstable burning, said propellant having a rapid burn rate below that associated with Taylor unstable burn. In another embodiment, the grains are held within and the voids are filled with viscous fluid binder such as a petroleum oil, said binder functioning to hinder Taylor unsatable burning and yet permit very rapid burning within the propellant volume.

Continuous measurement of the burning rate of a composite solid propellant.

Abstract: A method for continuous, high-resolution measurement of the burning rate of a solid propellant has been devised and used successfully in preliminary tests. The method consists of using a solid-propellant strand as the dielectric material of a capacitor forming a part of a resonant L-C circuit oscillating at a center frequency of 10.7 MHz. The capacitance and resonant frequency of the circuit vary linearly with strand length during burning. This frequency variation, converted to a voltage proportional to the strand length, was electrically differentiated to obtain a voltage directly proportional to the burning rate of the strand. Preliminary tests in a Crawford burner at several different pressure levels indicate good agreement of this capacitance method with the standard fuse wire method of obtaining burning rates. Because of the high sampling frequency, the capacitance method should be applicable to continuous burning-rate measurements in a nonsteady pressure environment.