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The Possibility of the Use of High Explosive Layers in Ram Accelerators

100%

Kobiera A. , Wolański P.

2008

tom Vol. 28 nr 3-4

149-171

The possibility of the use a high energetic solid material in a ram accelerator is discussed in this paper. First, some facts about multiphase combustion observed in ram accelerators are presented. While the core problem of using high explosive in supersonic propulsion is fast combustion, the first stage of work consisted of measuring ignition delays of selected high explosives. The ignition is triggered by a passing detonation wave. The experimental results proved that those materials can be applied to the ram accelerator and PETN has been selected as the best material. Next, a numerical model of ignition and combustion of a high explosive layer in a ram accelerator has been created and applied in numerical simulations. The obtained results allowed estimations of thrust enhancement and parametric analysis of the influence of some parameters on performances of the device. It was found that use of layers of high explosive can increase the generated thrust by about 10%. However this depends on such parameters as the speed of the projectile, initial pressure of the gaseous mixture, and the geometry of the projectile.

Theoretical and Experimental Study on Detonation Wave Propagation in Cylindrical High Explosive Charges with a Wave-shaper

70%

Pan J. , Zhang X. , He Y. , Deng Q. , Guan Z.

2016

tom Vol. 13, no. 3

658--676

The use of a cylindrical high-explosive charge with a wave-shaper is an efficient way to obtain an ultra-high pressure and a convergent detonation wave. An analysis of flow fields corresponding to the regular and Mach reflection of detonation waves in a cylindrical high-explosive charge with a wave-shaper is presented in this paper. The pressure, flow velocity and triple point growth angle of the Mach stem were calculated. The Mach stem height was also determined by using the modified Whitham method. The results show that the Mach stem height rises from zero at the critical angle of Mach reflection and changes to the Chapman-Jouguet detonation state with the propagation of the detonation waves. Shock indentation experiments were conducted, in which a wave-shaper was used in a cylindrical high-explosive charge to form Mach reflection detonation waves. The results showed that the discrepancy between the experimental results and the theoretical calculations was less than 15%, which proves the validity of the proposed theoretical model.

Directional Warhead Design Methodology for a Tailored Fragment Beam

70%

Dhote K. D. , Murthy K. P. S. , Rajan K. M. , Sucheendran M. M.

2015

tom Vol. 12, no. 4

637--649

In this article, the authors present a design methodology for generating a spatially tailored fragment beam with specified velocity and projection angles. The modified Gurney equation was used to estimate the length and diameter of the cylindrical charge to achieve the desired velocity; and the modified Taylor equation was used to arrive at the radius of curvature of the fragmenting disc. The methodology is further explained for generating a rectangular beam of fragments having a velocity of 1500 m/s with a tailored fragment beam of 32° in the azimuth and 20° in the elevation. The warhead had preformed steel fragments of 4 mm diameter arranged in a double layer. The design was validated using the fragment distribution measured experimentally.

Rate of the energy release in high explosives containing nano-size boron particles

60%

Kanel G. I. , Utkin A. V. , Razorenov S. V.

Central European Journal of Energetic Materials

2009

tom Vol. 6, nr 1

15-30

With a goal to obtain information on rate of the high explosive decomposition and equation of state of the HE formulations and detonation products, measurements of the pressure and particle velocity profiles of shock and detonation waves have been performed for pure coarse-grain and fine-grain HMX and for the HMX+16.4% boron mixture. For these measurements, the manganin pressure gauges and the laser Doppler velocimeter VISAR were applied. Effect of boron in the energy release process was observed both in the detonation and shock-wave initiation regimes.