| || Metallised Fuel rich Propellants for Solid Rocket Ramjet: A Review
Author : Singh, Haridwar ;Asthana, S.N.;Athawale, B.K.
Source : Defence Science Journal ; Vol:44(4) ; 1994 ; pp 269-278
Subject : 662.3 Propellants;66 Chemical Technology
Keywords : Metal combustion ;Binders;Combustion;Oxides;Metallised propellants;Metallised fuel rich propellants
Abstract : This paper reviews the research work carried out in the field of metallised fuel-rich propellants (FRP). Limitations and merits of various potential metals (Al, Mg, B, Be, or Zr) as a component of FRP are discussed. The paper also includes a discussion on the combustion mechanism of metallised propellants, including problem areas and probable remedial measures. Zirconium and Ti appear to have potential to offer FRP with efficient combustion. Ideal performance is not achieved with current systems based on Al and B and further work is needed to develop FRP having all three desirable attributes, viz., ease of ignition, stable combustion and high specific impulse (I/sub sp/) in a single composition.
| || Impact Friction Shock Sensitivities and DDT Behaviour of Advanced CMDB Propellants
Author : Asthana, S.N.;Athawale, B.K.;Singh, Haridwar
Source : Defence Science Journal ; Vol:39(1) ; 1989 ; pp 99-107
Subject : 66 Chemical Technology;662.3 Propellants
Keywords : PETN based compositions;AP based compositions;Composite propellants
Abstract : This paper reports results of impact, friction and shock sensitivities of CMDB propellants containing AP, RDX, PETN and their combinations. Results of impact and friction sensitivities indicate that CMDB propellants containing AP are highly sensitive and AP-based compositions are more impact and friction sensitive than RDX and PETN-based compositions, and that these sensitivities are proportional to oxygen balance of the composition, which is in agreement with earlier findings. Inclusion of high explosives like RDX and PETN increases the shock sensitivity of CMDB formulations, whereas AP-based compositions are least shock sensitive. There exists a relationship between shock sensitivity and VOD of the individual oxidiser/high energy ingredient incorporated in the formulation. Shock amplitude values of 87 and 46 k bar in CMDB propellants are much more shock sensitive than DBP. Composite propellants are insensitive to shock, as they did not undergo detonation even at zero card gap. Results of DDT behaviour of CMDB propellants show that they are more prone to deflagration to detonation transition under adverse conditions.