Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.160
pages 132-145

EXPERIMENTAL AND NUMERICAL STUDY OF CASTING PROCESS EFFECTS ON SMALL SCALE SOLID ROCKET MOTOR BALLISTIC BEHAVIOR

P. Le Breton
SNPE Propulsion, B.P. 57, 33166 SAINT MEDARD EN JALLES, CEDEX, FRANCE
D. Ribereau
SNPE Propulsion, B.P. 57, 33166 SAINT MEDARD EN JALLES, CEDEX, FRANCE
C. Marraud
SNPE Propulsion, B.P. 57, 33166 SAINT MEDARD EN JALLES, CEDEX, FRANCE
P. Lamarque
SNPE Propulsion, B.P. 57, 33166 SAINT MEDARD EN JALLES, CEDEX, FRANCE

RÉSUMÉ

It is now well admitted that the ballistic response of solid rocket motors depends on the process used to manufacture it. Usually, the empirical parameters necessary to predict the performance of a motor (hump effect and scale factor), linked to the manufacturing process, are deduced from the exploitation of previous firing tests. The objective of our studies is to explain physical phenomena linked to those empirical parameters. One step in these studies has been to manufacture, with the same propellant, six small scale grains using three casting processes and to study the influence of the manufacturing process on the ballistic behavior. Three of those grains have been fired. The exploitation of firing tests results gave the hump effect for each casting process, and the scale factor between two casting processes. The last three grains have been cut in several samples for local measurements of burning rate (strand-burner and ultrasound measurements) and density. Nuclear Magnetic Resonance (NMR) imaging visualizations have also been done. The main results of experimental analysis are the profile of the radial burning rate on the web coherent with the hump effect, the strong ratio between radial and axial burning rates on each point of the web, and the visualization of propellant stratification by NMR imaging due to the casting method.
The experimental results have then been compared to a numerical simulation performed using a new code developed at SNPE to compute surface bum-back with varying burning rate. In this mathematical model, the propellant should not be homogeneous like it is in constant burning rate simulations. The nature and the form of the heterogeneities are linked to the casting method. They may be deduced from a casting simulation performed at SNPE with the MONTREAL® code or from NMR imaging. The burning rate at one point of the combustion area depends on the local angle between the combustion front and a physical parameter characteristic of the propellant flow organization.
Experimental and numerical results are in very good agreement. This means that the simulation gives results very close to experimental results in term of hump effect, scale factor between two casting processes, local burning rate profiles, and local anisotropy of propellant. Our conclusion is that our model is able to predict the global behavior of a grain motor when the stratification can be deduced from casting simulations or NMR imaging visualizations.


Articles with similar content:

SPONTANEOUS RADIATION HEAT FEEDBACK MEASUREMENTS IN RADIAL BURNING PROPELLANT SAMPLES
International Journal of Energetic Materials and Chemical Propulsion, Vol.5, 2002, issue 1-6
G. S. Tussiwand, Fabio Cozzi, A. L. Ramaswamy
RADIATIVE IGNITION OF SOLID PROPELLANTS: A PRACTICAL APPROACH
International Journal of Energetic Materials and Chemical Propulsion, Vol.9, 2010, issue 4
Franck Cauty, Yves Fabignon, Charles Erades
ADVANCEMENTS IN ULTRASOUND MEASUREMENT ON LARGE-SCALE SOLID ROCKET MOTORS
International Journal of Energetic Materials and Chemical Propulsion, Vol.6, 2007, issue 4
G. Fouin, S. Ballereau, M. Pawlowski
EXPERIMENTAL STUDY ON MIDWEB ANOMALY OF COMPOSITE PROPELLANT GRAINS
International Journal of Energetic Materials and Chemical Propulsion, Vol.8, 2009, issue 2
Toru Shimada, Hiroshi Hasegawa
FLAME TO PLATE HEAT TRANSFER CHARACTERIZATION
International Heat Transfer Conference 13, Vol.0, 2006, issue
R. Loubat, Y. Murer, B. Estebe, Pierre Millan, Philippe Reulet