Science and Technology of Energetic Materials

Vol.61, No.2 (2000)

Research paper

Fast-depressurization extinction of solid-propellan strands(*in Japanese)
Masafumi Tanaka and Chikafumi Nakao


A simplified method to cause combustion extinction in strand burner was proposed. To its vent port, a pneumatic ball valve with a large area was attached to induce fast depressurization. The depressurization rate required for strand extinction was found to be about one fifth of motor test criterion. This is due to a heat loss that surrounding nitrogen gas quenches the combustion gas above the burning surface through rapid adiabatic expansion. Numerical solution of unsteady heat transfer equation with KTSS flame model clarified that 20 % heat loss reduces the depressurization rate for extinction by half. Luminosity history during fast depressurization is available to determine the instantaneous pressure of extinction, which is of importance to observe the extinguished surface and discuss the combustion mechanism.

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