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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748

ACTIVATION OF DETONATION-TO-DEFLAGRATION TRANSITIONS IN PULSED DEONATION COMBUSTOR BY WALL HEATING

M. Assad
A.V. Luikov Heat and Mass Transfer Institute of National Academy of Sciences of Belarus, 15 P.Brovki str., 220072 Minsk, Belarus

Oleg G. Penyazkov
Laboratory of Physical-Chemical Hydrodynamics, Department of Physics and Chemistry of Nonequilibrium Media A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, Minsk, Belarus

DOI: 10.1615/TFESC1.asp.012900
pages 147-150


KEY WORDS: Liquid fuel, Deflagration-to-detonation transition, Pulsed detonation combustor

Abstract

A series of experiments were performed with a liquid fuel pulsed detonation combustor that is a 20-mm dia partitioned tube equipped with a pre-chamber shaped as a hemispherical cavity with a conical duct for transition to the tube. The total length of the setup is 664 mm. A mixture is being ignited by a spark plug mounted in the closed endwall of the combustor. Fuel is being injected by the injector located in the intersection zone of hemispherical and conical parts of the pre-chamber. Analysis of large-number of working cycles with combustion of near-stoichiometric heptane/air/oxygen mixtures (φ = 1.04) revealed a variation of the wave velocity in the range 500 − 2500 m/s. The detonation was recorded at distances 140 − 640 mm from place of spark that is 7 − 32 tube diameters. It was shown that such scatter of the wave velocities and pre-detonation distances was due to a degree of thermal activation of a mixture prior to its ignition.

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