Abstract
Weak-extinction data obtained from an experimental apparatus designed to simulate the characteristics of practical afterburner combustion systems are presented. The apparatus supplies heterogeneous fuel-air mixtures of varied temperature, velocity, and degree of prevaporization to V-gutter flameholders of various widths and shapes similar to those found in jet engine systems. The fuel employed is a hydrocarbon whose chemical composition and physical properties correspond to those of aviation kerosene JP 5. An analysis that accounts for heterogeneous physical transport processes is described. This analysis extends a previously derived homogeneous stability analysis, based on stirred-reactor theory, to include the characterization of bluff-body systems supplied with nonuniform, heterogeneous, fuel-air mixtures. The ability of the analysis to capture observed experimental trends indicates that a stirred-reactor approach, coupled with appropriate heterogeneous transport models, provides a framework for predicting the lean-blowout limits of practical flameholder systems.
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