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.

Modelling of Heat Loss in Closed Vessels during propellant Burning

Abstract: Closed vessel technique is essentially used to determine the force constant, vivacity and the burning rate of gun propellants. In fact, it is the only method to find out these three parameters experimentally. It is a well-known fact that however small the propellant burning time may be, there will be heat loss to the walls of the vessel due to conduction, convection, radiation and also due to the expansion of the vessel. This fact necessitates applying correction to the observed maximum pressure in the experiment. An analysis is presented in this paper as to how this heat loss can be modelled along with discussion about other models reported in this field.

Gas Evolution from a Solid Rocket Propellant during Depressurization to Produce a Quench

Abstract: Mass flow rate of gas evolution from burning solid rocket propellant during transient depressurization of combustion chamber

High-speed Visualization of Flame Propagation in Explosions

Abstract: Flow visualization data is presented to describe the structure of flames propagating in methane-air explosions in semi-confined enclosures The role of turbulence is well established as a mechanism for increasing burning velocity by fragmenting the flame front and increasing the surface area of flames propagating in explosions This area increase enhances the burning rate and increases the resultant explosion overpressure In real situations, such as those found in complex process plant areas offshore, the acceleration of a flame front results from a complex interaction between the moving flame front and the local blockage caused by presence of equipment It is clear that any localised increase in flame burn rate and overpressure would have important implications for any adjacent plant and equipment and may lead to an escalation process internal to the overall event To obtain the information required to quantify the role of obstacles, it is necessary to apply a range of sophisticated laser-based, optical diagnostic techniques This paper describes the application of high-speed, laser-sheet flow visualization and digital imaging to record the temporal development of the flame structure in explosions Data is presented to describe the interaction of the propagating flame with a range of obstacles for both homogeneous and stratified mixtures The presented image sequences show the importance of turbulent flow structures in the wake of obstacles for controlling the mixing of a stratified concentration field and the subsequent flame propagation through the wake The data quantifies the flame speed, shape and area for a range of obstacle shapes

Analysis of ballistic anomalies in solid rocket motors

Abstract: Ballistic anomalies, defined as pressure deviations from the normally expected trace, have occurred frequently during solid rocket motor firings. This paper describes techniques for determining the probable cause of such anomalies. Mass and energy balance relationships, which account for changes in chamber volume and throat area, are derived for the purpose of calculating a burning surface history that corresponds to pressure data from flight measurements or static tests. Results indicate that chamber temperature variations caused by ballistic anomalies are negligible. Characteristic burning surface signatures for propellant voids, cracks, unbonds, and high burn rate pockets are discussed. Conservation of momentum relationships are derived for the purpose of describing anomalies caused by mass ejection through the nozzle throat. Specific examples form inertial upper stage motors and the Titan T34-D solid rocket booster are presented to illustrate the application of the generic analysis techniques described in this paper.