| || Parametric studies on star port propellant grain for ballistic evaluation
Author : Shekhar, Himanshu
Source : Defence Science Journal ; Vol:55(4) ; 2005 ; pp 459-469
Subject : 623.4 Armaments and Ballistics;662.3 Propellants
Keywords : Solid propellant grain;Ballistic evaluation;Star port propellant grains;Tail off factor;Burning rate;Ballistic evaluation motor;Propellant configuration;Tail off reduction;BEM
Abstract : Star port propellant grains have been extensively studied for their operating as well as geometrical parameters. It is observed that reduced tail-off and better neutrality cannot be achieved simultaneously in a configuration. Parametric study is conducted to know the effect of various parameters of star-shaped propellant grains for ballistic evaluation motor. For reduced tail-off, higher characteristic velocity, lower outer diameter of the star, and lower value of angular fraction is preferred. Star angle, burning rate, and throat diameter have negligible effects on the tail-off factor. For better neutrality, higher value of angular fraction, higher star outer diameter, and star angle near to neutrality, is needed. An alternate configuration is suggested using this parametric study to ascertain least tail-off and enhanced neutrality.
| || Application of Ultrasonic Technique for Measurement of Instantaneous Burn Rate of Solid Propellants
Author : Padmanabhan, M.S. ;Sridharan, P.;Jeenu, R.;Desh, Deepak
Source : Defence Science Journal ; Vol:48(2) ; 1998 ; pp 197-204
Subject : 662.3 Propellants;620.261 Explosives
Keywords : Burn rate measurements ;ballistic evaluation;Post test data processing;Propellant specimens;Aluminised composite solid propellants;Ultrasonic pulse echo technique
Abstract : The ultrasonic pulse-echo technique has been applied for the measurement of instantaneous burn rate of aluminised composite solid propellants. The tests have been carried out on end-burning 30 mm thick propellant specimens at nearly constant pressure of about 1.9 MPa. Necessary software for post-test data processing and instantaneous burn rate computations have been developed. The burn rates measured by the ultrasonic technique have been compared with those obtained from ballistic evaluation motor tests on propellant from the same mix. An accuracy of about approximate 1 per cent in instantaneous bum rate measurements and reproducibility of results have been demonstrated by applying ultrasonic technique.