Results 261 to 270 of about 12,562 (305)

A model for double base propellant combustion

Symposium (International) on Combustion, 1989
A model has been developed to describe the combustion of double base propellants with a primary objective to develop a better understanding of the combustion mechanisms of double base propellants in both condensed and gas phases. The gas phase in double base propellants sustains two flames which are separated by a dark zone at low pressure.
Alain Bizot, M.W. Beckstead
openaire   +1 more source

Flame spreading phenomena in double base propellants

Combustion and Flame, 1975
Abstract The rates of flame spread over the surface of a double base propellant were measured as a function of the pressure and of the oxygen concentration at 0.21 mole fraction and below, typical of conditions prevailing during rocket motor ignition. Relationships have been established between the flame spread rate and the burning rate, which show a
K.M. Siddiqui, I.E. Smith
openaire   +1 more source

Artificial ageing of double base rocket propellant

Journal of Thermal Analysis and Calorimetry, 2009
The ageing of double base rocket propellants (DB rocket propellants), which is a consequence of chemical reactions and physical processes that take place over time, has significant effect on their relevant properties (e.g. chemical composition, mechanical properties, ballistic properties, etc.).
Sućeska, Muhamed, Matečić Mušanić, Sanja   +1 more
openaire   +2 more sources

Combustion wave of metalized extruded double-base propellants

Fuel, 2019
Abstract Aluminum metal fuel, with combustion heat of 32,000 J/g, is of interest as high energy density material. Aluminum is able to react not only with free oxygen but also with inert combustion gaseous products. This study reports on the impact of ultrafine aluminum particles on combustion characteristics of double-base propellant.
Sherif Elbasuney, Ahmed Fahd
openaire   +1 more source

Experimental study of Double‐Base Propellants Combustion Mechanisms

Propellants, Explosives, Pyrotechnics, 1985
AbstractExperimental results about rb(P) laws of double‐base propellants are presented. The influence of many parameters (calorific potential, fabrication process, additives) is studied. With surface structure examination, we show that the first super‐rate (P < 100 bar) is in relation with the presence of a carbon layer which increases chemical ...
J. Duterque, J. Hommel, G. Lengelle
openaire   +1 more source

Mechanism of combustion of catalyzed double base propellants

Combustion and Flame, 1988
Abstract Existing combustion models, namely, photo chemical theory, chelate and π-complex theory, and free radical mechanism and carbon/carbonaceous matter formation theory, for catalyzed double base propellants have been evaluated in the light of the experimental findings of the present study.
Haridwar Singh, K.R.K. Rao
openaire   +1 more source

Studies on thermal decomposition of double-base propellants

Journal of Spacecraft and Rockets, 1983
The scanning thermogram of a block sample of a double-base propellant shows a shoulder around 200°C which is not observed in a powder sample of the sample propellant. The heat of decomposition was also found to be different In the two cases. Product analysis and activation energy calculations show that nitroglycerine un dergoes decomposition in the ...
Verneker, VRP, Kishore, K, Subhas, CBV
openaire   +1 more source

Impact fracture behaviour of double-base gun propellants

Journal of Materials Science, 1985
Impact fracture properties of three nitrocellulose—nitroglycerine gun propellants have been measured in a three-point bend mode at moderate impact rates with an instrumented drop-weight impact tester. Dynamic moduli and loss tangents were measured over the temperature range −100 to +120° C, and three transitions were identified.
openaire   +1 more source

New Stabilizers for Double-Base Propellants

Journal of Propulsion and Power, 1995
Adly A.-W. Soliman, A. A. El-Damaty, M. A. M. Hasan   +2 more
openaire   +1 more source

Acquiring tissue for advanced lung cancer diagnosis and comprehensive biomarker testing: A National Lung Cancer Roundtable best‐practice guide

Ca-A Cancer Journal for Clinicians, 2023

exaly