Results 211 to 220 of about 591 (257)

The migration of plasticizer in solid propellant grains

Polymer International, 1993
Abstract The migration of the plasticizer, dioctyl adipate (DOA) in the accelerated ageing of composite propellant has been studied. The method is based on the extraction of DOA with carbon tetrachloride and its estimation by gas chromatography.
D. Venkatesan, M. Srinivasan, K. Audisesha Reddy, V. V. Pendse   +3 more
openaire   +1 more source

The Morphological Continuum in Solid Propellant Grain Design

1970
Grain configurations for solid propellant rockets are classified by relative web thickness and mean vector direction of burning surface into a topological continuum. This ranges from the thin web dendrite (web equal to 1/6 of charge radius and entirely in the cross-section plane) thru the wagon-wheel- and star-perforated grains (1/4 to 1/2 web range ...
J.S. BILLHEIMER, F.R. WAGNER
openaire   +1 more source

Flame spreading and ignition transients in solid grain propellants

AIAA Journal, 1964
An analysis of grain ignition and flame spreading in solid-propellant rocket engines was performed to calculate chamber pressure as a function of time during this phase. Assumed for the analysis were isothermal one-dimensional gas flow in the chamber, spatially uniform gas pressure, two-dimensional transient heat conduction in the grain, perfect gas ...
DeSoto, S., Friedman, H. A.
openaire   +2 more sources

Embedded Sensors for Monitoring Solid Propellant Grains

41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2005
Rocket motors normally determine missile system service li fe. However, accurate rocket motor service life predictions are difficult and have always been compromised by both complex loading and the non -linear viscoelastic behavior of the highly filled solid propellant grains.
Herb Chelner, Jim Buswell, Danny Evans
openaire   +1 more source

Thermal Stresses in Solid Propellant Grains

Journal of Jet Propulsion, 1956
A method is presented for computing the maximum thermal stress in solid propellant grains tha t can result from temperature cycling. The method is based upon a first approximation obtained from the analytical solution for thermal stresses assuming Young's modulus to be independent of temperature.
openaire   +1 more source

Fracture of solid rocket propellant grains

Engineering Fracture Mechanics, 1992
Abstract The importance of fracture criteria in the failure assessment of solid propellant grains is briefly described. Computation of the crack tip stress intensity factor and the development of the crack growth rate equation through fracture properties essential for fracture analysis are also discussed.
openaire   +1 more source

Propellant Grain with Maximum Combustion Efficiency of Metal

Key Engineering Materials, 2016
This paper reports on the ways of allocating the metal particles in the propellant grain of tube cross-sectional type to provide maximum combustion efficiency of metal. Two-dimensional flow field and the burning rate law govern a transport of the burning metal particles.
Leonid Minkov, Ernst R. Shrager, Elizaveta V. Pikushchak   +2 more
openaire   +1 more source

On the dynamics of propeller-like dust grain in plasma

Physics of Plasmas, 2013
The equations of motion of a dust grain with non-spherical shape in plasma are generalized by incorporating the effects associated with propeller-like features of the grain's shape. For the grain shape close to rotationally symmetric, the stability of “stationary” (in terms of variables used in the grain dynamic equations) solutions are considered.
openaire   +1 more source

Burning rate anomaly of composite propellant grains

Combustion, Explosion, and Shock Waves, 2013
In this study, characteristics of the burning rate anomaly in composite propellant grains are investigated. The burning rate anomaly has been known as the “midweb anomaly” or the “hump effect.” This paper describes some results of an experimental study on effects of propellant formulations, casting processes, and viscosity of the propellant slurry on ...
H. Hasegawa, M. Fukunaga, K. Kitagawa, T. Shimada   +3 more
openaire   +1 more source

Grain velocities during ignition of gun propellant

Combustion and Flame, 1975
Abstract By means of a dual-flash X-ray technique, propellant grain velocities during ignition have been determined for the Navy 5-in./38 gun. At the completion of ignition, the velocity profile along the grain bed is sharply peaked with maximun velocity at the propellant free surface.
openaire   +1 more source