The flaw-field interaction among detonation tubes a common nozzle in a multi-tube pulsed engine is explored. The evaluations are based m a two-dimensional analysis of first-pulse operation and use a viscous, eight-species, finite-rate, transient flow-field model. Configurations involving single, dual, and triple tubes are considered in both short- and long-versions. The common nozzle provides a path which the detonation from one tube causes a pressure spike in adjacent tubes. Previous studies indicate that the strength of this spike can vary by a factor of five depending on the nozzle throat area and inter-tube geometry. The present study indicates that the flow-field interaction among three tubes is approximately a factor of three smaller than the interaction between two tubes, and increased tube length does not have a significant effect. The results serve as an important precursor to understanding appropriate propellant fill procedures and shock wave propagation in multi-tube simulations.
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