A high-performance propellant (schubertit) with very low burning rate was developed by matching the particle size and the composition of a mixture of NH₄ClO₄ and RDX.A polybutadiene-based 2-component binder was used.The new propellant provides a specific impulse of 2324 Ns/kg at a mean combustion chamber pressure of 190 bar.The burning rate is 8.5 mm/s.

International Annual Conference of ICT

Numerical simulation of hot gas flow in water

Author: Schumann, H. J. ; Bottger, W.

Numerical simulation results are presented for the flow pattern of a fully cavitating underwater vehicle equipped with a tractor solid propellant rocket motor.In the higher velocity regime cavitation sets in, which considerably reduces the vehicle drag and changes the flow pattern of the motor exhaust gas as compared to the non-cavitating case.Three steps of modeling are discussed.In the 1st step, the free flow behavior of the tractor motor was calculated with a finite differences code.The resulting plume agrees well with video recordings of static rocket firings in air.The results of this simulation were used in for a numerical finite differences calculation of the gas flow inside the cavitation bubble.Finally, an anal. extension of the numerical model shows that depending on the flow and loss rate of the gas, the pressure inside the cavitation bubble will exhibit an irregular behavior over time.

International Annual Conference of ICT

Combination of warhead-explosive/solid propellant-charge for low-cost underwater rockets

Author: Hebekeuser, H. P. ; Mackowiak, H. P. ; Schoffl, R.

A low-cost combined explosive/solid propellant charge for underwater rockets was developed and tested.The composition and the theor. performance data are given , the burn-up behavior, mech. properties, and the explosion heat and detonation velocity were investigated.The combined explosive/propellant shows good results in the pressure range ≤150 bar.

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