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 | Investigation of Ignition of Liquid Propellant in Reservoir in Regenerative Liquid Propellant Gun Trials
Author : Mitra, S.C. ;Shah, S.T.;Ghosh, A.A.;Rao, K.R.;Kharat, D.K.;Daniel, K.J.
Source : Defence Science Journal ; Vol:47(2) ; 1997 ; pp 185-192
Subject : 66 Chemical Technology;662.3 Propellants
Keywords : Combustion ignition ;Regenerative liquid propellant guns (RLPGs);Internal ballistic processes
Abstract : It is important to understand the internal ballistic processes for the development of regenerative liquid propellant guns (RLPGs). A 30 mm RLPG test fixture was developed and firing trials were conducted to study the performance of the gun. During the trials, sometimes, combustion ignition in the reservoir took place resulting in substantial damage to the injection piston. This paper highlights the possible causes of this combustion and offers suggestions. regarding improvement in the design. An elaborate instrumentation set-up which could pinpoint the specific conditions leading to failures is suggested. |
| | Pyrotechnic Igniters for Liquid Propellant Gun
Author : Mitra, S.C. ;Shah, S.T.;Ghosh, A.A.;Rao, K.R.;Kharat, D.K.;Daniel, K.J.
Source : Defence Science Journal ; Vol:47(2) ; 1997 ; pp 193-196
Subject : 66 Chemical Technology;662.3 Propellants
Keywords : Combustion chamber ;Pyrotechnic igniters;Liquid propellant guns;Liquid propellants
Abstract : The results of a preliminary investigation on the use of liquid propellant for gun application are presented. Both regenerative and bulk loaded liquid propellant guns were used in the study.Pyrotechnic igniters were tried out for igniting the liquid propellant. Existing pyrotechnic igniters were suitably modified to obtain pressure beyond 20 MPa in less than 3 ms in the combustion chamber. |
| | Modelling of a Regenerative Liquid Propellant Gun
Author : Rao, K.R. ;Ghosh, A.A.;Daniel, K.J.;Tatake, S.G.;Dhami, G.S.
Source : Defence Science Journal ; Vol:45(2) ; 1995 ; pp 161-171
Subject : 662.3 Propellants;66 Chemical Technology
Keywords : Liquid propellant mass ;Conceptual gun;Liquid propellant guns
Abstract : In the development of liquid propellant guns (LPG), there are numerous interdependent parameters which affect the performance of the gun. There are some difficulties in arriving at the dimensions of its various components. To help in this task, computer simulation was undertaken to predict the performance of a conceptual gun. This is a sensitivity study aimed at exploring the relationship between the interdependent parameters. The parameters which have a direct bearing on the performance of the gun, like areas of cross-section of vents, differential piston dimensions liquid propellant mass, and the combustion and reservoir chamber dimensions have been studied. The expected pressures and other parameters could be studied with the help of this model is thus helpful in the optimization of the design of LPGs. |
| | Modelling and Simulation of a Railgun powered by a Capacitor Bank
Author : Khan, I.I. ;Rao, K.R.;Tokekar, K.P.;Ghosh, A.A. ;Daniel, K.J.;Tatake, S.G.
Source : Defence Science Journal ; Vol:44(2) ; 1994 ; pp 131-137
Subject : 681.3 Computer Science;621.38 Electronics
Keywords : Hypervelocity projectiles;Optimized launcher pressure ;Payload velocity
Abstract : A railgun powered by a capacitor bank was developed to launch hypervelocity projectiles. The efficiency of the gun to a large extent will determine its feasibility for weapon applications. A simulation code was developed to predict the performance of the railgun. The railgun has been modelled as a time-varying impedance to determine the currents and the voltages from the power source. In the railgun circuit the currents and the voltages are of the order of hundreds of kiloamperes. Even very low impedances of the order of milli-ohm and micro-henry are substantial sources of energy losses. The measured and simulation currents at peak values agree with in 10%, validating the model. The simulation code accurately predicts the energy distribution in the system. Maximization of the projectile energy leads to improved and efficient designs. The simulation also leads to the optimized launcher pressure and payload velocity. |
| | Railgun
Author : Khan, I.I. ;Ghosh, A.A.;Rao, K.R.;Daniel, K.J.;Tatake, S.G.
Source : Defence Science Journal ; Vol:44(3) ; 1994 ; pp 257-262
Subject : 531.55 Projectiles
Keywords : Simulation ;Data acquisition;Computer based data acquisition system;Hypervelocity projectiles;Electromagnetic propulsion
Abstract : A railgun using cwas developed to launch hypervelocity projectiles. A 240 kJ, low inductance capacitor bank operating at 5 kV powered the railgun. Launchers and projectiles were designed and developed for this purpose. The currents producing the launch forces of the order of hundreds of kA. Even very low impedances for the current through the railgun circuit are substantial sources of energy losses. A simulation code was developed to optimise the performance of the railgun. Control and instrumentation facilities were set up along with a computer-based data acquisition system for measurement and analysis. The capacity to launch projectiles of 3-3.5 g weight to a velocity of more than 2.00 km/s was demonstrated. |
| | Numerical Modelling of Regenerative Liquid Propellant Guns with Annular Piston
Author : Mitra, S.C. ;Shah, S.T.;Rao, K.R.;Kharat, D.K.;Daniel, K.J.
Source : Defence Science Journal ; Vol:47(1) ; 1997 ; pp 119-128
Subject : 66 Chemical Technology;662.3 Propellants
Keywords : Internet ballistics ;Computer simulation
Abstract : The development of regenerative liquid propellant guns (RLPGs) needs due consideration of numerous interdependent parameters that affect its performance. To help in this task, computer simulation was undertaken to predict internal ballistics of a conceptual liquid propellant gun. The expected pressure and other important parameters are documented which serve as an aid to the hardware, design of the regenerative liquid propellant guns. |
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