Importance

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Abstract

An apparatus and/or system for an acoustically stable combustion chamber includes a combustion chamber with a geometry predetermined to shape resonant acoustic modes. The geometry diminishes coupling between resonant acoustic modes and driving mechanisms at a head portion and enhances coupling between resonant acoustic modes and damping mechanisms at an aft portion while meeting a predetermined stability level. The geometry diverges radially outward in an aftward direction at a divergence angle (A_D) relative to a longitudinal axis, a diameter at the diverging portion is greater than at the injector end. An injector coupled at the head portion includes injector ports in a coplanar arrangement. The configuration of the injector ports alters the speed of sound profile of the combustion, drawing resonant acoustic modes towards the aft portion where the speed of sound is lower. Methods for simulating, designing, and using the acoustically stable combustion chamber are disclosed.

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First Claim