| || Motion state of fuel within shell in projection acceleration process
Author : Zhang, Qi ;Lin, Dachao;Bai, Chunhua
Source : Defence Science Journal ; Vol:53(3) ; 2003 ; pp 259-265
Subject : 623.4 Armaments and Ballistics;531.55 Projectiles
Keywords : Projection acceleration process;Fuel air explosive;Warheads;Liquid solid mixture fuel;FAE;FAE warheads;Projectile motion;Projection process;FAE weapons
Abstract : The fuel-air explosive (FAE) warheads are charged with the liquid-solid mixture fuel. The fuel is different from conventional solid explosives in physical and mechanical properties. The mass centre of the charged fuel changes during projecting the projectile. In this study, a method to calculate the mass centre change of the charged fuel is suggested and the influence of this change on the projectile motion state in the projection process is discussed. The results show that in projection, the fuel mass centre varies with the projection acceleration and the deformation characteristics of the mixture fuel. The higher is the acceleration, the larger is the displacement of the mass centre. This displacement also increases with the compressibility of the fuel. It constitutes an influence on the state of motion for the whole projectile in the projection process, whose calculation approach is also proposed. The result provides a theoretical basis for the design of the FAE weapons.
| || Numerical Simulation on Dispersal Character of Fuel by Central HE
Author : Qi, Zhang;Kezhen, Wei;Aimin, Luo;Denggui, Wang;Bin, Qin
Source : Defence Science Journal ; Vol:57(4) ; 2007 ; pp 425-433
Subject : 623.5 Armaments and Ballistics;620.261 Explosives
Keywords : Fuel-air explosive;Explosion;Numeral compute;Dispersal velocity;FAE
Abstract : A fuel-air explosive (FAE) device consists of a shell (top-end cover, bottom-end cover, shellside wall), a mixed fuel, a central pipe and a burst high-explosive (HE) charged in the central pipe. The mixed fuel is filled in a column structure and dispersed by the explosion drive of central burst HE in the central pipe. The dispersed fuel mixes with air, which produces combustible cloud which can be detonated. That is the fuel-air explosive (FAE). The height and ignition position of the central HE charged column affect the fuel dispersal process. The initial stage of fuel dispersal was simulated by numerical computation. The simulation result indicated that the distribution of fuel dispersal velocity, when the central HE is ignited at the end, is not the same as that when the central HE is ignited on the axis of the central HE simultaneously. When the ratio of the column height of the central HE and that of the FAE device is 0.64~0.73, the distribution of fuel dispersal velocity has little difference when the central HE is ignited at the end of column. But, when the ratio of the column height of the central HE and that of the FAE device is 0.89, the fuel axial dispersal velocity is obviously more than that when the ratio of the column height of the central HE and that of the FAE device is 0.64~0.73.
| || Critical ignition temperature of fuel air explosive
Author : Zhang, Qi;Bai, Chun Hua;Dang, Hai Yan;Yan, Hua
Source : Defence Science Journal ; Vol:54(4) ; 2004 ; pp 469-474
Subject : 620.261 Explosives ;623.4 Armaments and Ballistics
Keywords : Adiabatic compression;Critical temperature;Fuel;Equation of state;FAE;Warhead charge;Critical ignition temperature;Mixed fuel
Abstract : The charge of fuel-air explosive (FAE) warhead usually is solid-liquid mixed fuel. The solid component is aluminium powder. To meet the demand of FAE weapon usage and storage safety, in the mixed-fuel medium, there must be gaps where adiabatic compression occurs during launching overloading of warhead. Adiabatic compression makes the temperature of the medium in the gaps to rise. High temperature can cause explosion of the mixed fuel during launching acceleration of the warhead, which is very dangerous. Because the fuel is a multicomponent mixture, the critical ignition temperature can’t be determined only by one component. Through experiment, the critical ignition temperature of the mixed fuel is attained, and the changing regularity of the pressure following the temperature is shown in this paper.