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.

Destroying airborne biological and/or chemical agents with solid propellants

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.

Theoretical considerations relating to the effect of injector designon unstable burning of liquid propellant rocket motors.

Abstract: : Rocket motors burn unstably when the rate of conversion of liquid propellants to product gases is influenced by disturbances in the internal gas dynamic field in such a way as to amplify the disturbances more than they are attenuated by the various damping mechanisms. Thus, it has long been recognized that coupling between the conversion process and the internal field is of vital importance to motor stability. Of the several mechanisms which are found to influence this coupling significantly, the influence of the injector configuration has been least studied theoretically. The present study is concerned with the influence of one specific family of injectors, namely the socalled like-on-unlike impinging doublet. It is clear that fluctuations in the gas dynamic field may cause the point of impingement to fluctuate, and thereby produce fluctuations in the rate of feed of liquid into the conversion region. That these fluctuations may have a very significant effect on motor stability is suggested by numerical calculations based on a crude analytical model. A number of the features of 'injector zone coupling' are then discussed physically, and shown to be to a large extent independent of the crudity of the analytical model. Certain of these considerations should have application to practical motor design. (Author)

Further studies concerning the energy distribution in the ETC closed chamber and the impact on observed propellant burn rate

Abstract: In this paper, the authors investigate the consequences of the changing chemical equilibrium states that occur during ETC closed chamber experiments and the associated impact on the propellant burn rate calculation. The theoretical results are compared with experimental data to determine the influence on the computed propellant burn rate when a plasma is present.

Study on Combustion Characteristics and Propelling Projectile Motion Process of Bulk-Loaded Liquid Propellant

Abstract: Data are presented showing that the problem of gas–liquid interaction instability is an important subject in the combustion and the propellant projectile motion process of a bulk-loaded liquid propellant gun (BLPG). The instabilities themselves arise from the sources, including fluid motion, to form a combustion gas cavity called Taylor cavity, fluid turbulence and breakup caused by liquid motion relative to the combustion chamber walls, and liquid surface breakup arising from a velocity mismatch on the gas–liquid interface. Typically, small disturbances that arise early in the BLPG combustion interior ballistic cycle can become amplified in the absence of burn rate limiting characteristics. Herein, significant attention has been given to developing and emphasizing the need for better combustion repeatability in the BLPG. Based on this goal, the concept of using different geometries of the combustion chamber is introduced and the concept of using a stepped-wall structure on the combustion chamber ...