Numerical Investigation of Three-Dimensional Multi-Tube Pulse Detonation*

The flow-field interaction among detonation tubes sharing a common nozzle in a multi-tube, pulsed detonation engine is explored. The evaluations are based on two-dimensional and threedimensional analysis of first-pulse operation, using a viscous, eight-species, finite-rate, transient flowfield model. Configurations involving dual and triple tubes for two-dimensional analysis, and four tubes for three-dimensional analysis are considered. The common nozzle provides a path through 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, and that increased tube length does not have a significant effect on strength of interaction. The present study indicates that the flow-field interaction among three tubes for two-dimensional analysis is approximately a factor of three smaller than the interaction between two tubes. However, the strength of the flow-field interaction among three-dimensional tubes compared to twodimensional tubes is similar. 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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