초록 ▼

The damping system comprises at least one resonant acoustic cavity disposed around the combustion chamber and having a shape and dimensions such that it functions simultaneously as a quarter-wave resonator and with tangential coupling the resonant acoustic cavity comprises: a) a main annular part wh

The damping system comprises at least one resonant acoustic cavity disposed around the combustion chamber and having a shape and dimensions such that it functions simultaneously as a quarter-wave resonator and with tangential coupling the resonant acoustic cavity comprises: a) a main annular part whose half axial section has a very elongate shape with a width dimension “e”which is very small compared to its longitudinal dimension “L1”which extends substantially parallel to the axis of symmetry of the combustion chamber, the mean radius “R”of the main annular part being close to the equivalent radius of modes of oscillation to be damped, and b) an annular coupling part which originates from the main annular part and which opens into the combustion chamber near to a longitudinal or radial pressure anti-node, the annular coupling part having a length “L2”in a half axial section and a width dimension “h”very much less than the sum of the longitudinal dimension “L1”of the main annular part and the length “L2”of the annular coupling part.

대표청구항 ▼

A damping system for high frequency combustion instabilities in a combustion chamber of a rocket engine comprising an injection head and an outer wall extending from said injection head downwardly around said combustion chamber, said outer wall comprising means forming a nozzle throat and said outer

A damping system for high frequency combustion instabilities in a combustion chamber of a rocket engine comprising an injection head and an outer wall extending from said injection head downwardly around said combustion chamber, said outer wall comprising means forming a nozzle throat and said outer wall extending further downwardly from said nozzle throat to define an open ejection cone, wherein the system comprises at least one resonant acoustic cavity disposed around the combustion chamber and having a shape and dimensions such that it functions as a quarter-wave resonator damping both longitudinal and tangential components of pressure waves, and wherein said resonant acoustic cavity comprises: a) a main annular part whose half axial section has an elongate shape with a width dimension “e”which is smaller than its longitudinal dimension “L1”which extends substantially parallel to the axis of symmetry of the combustion chamber, the mean radius “R”of the main annular part being close to the equivalent radius of modes of oscillation to be damped, and b) an annular coupling part which originates from the main annular part and which opens into the combustion chamber downstream from said injection head and upstream from said nozzle throat near to a longitudinal or radial pressure anti-node, the annular coupling part having a length “L2”in a half axial section and a width dimension “h”which is substantially less than the sum of the longitudinal dimension “L1 of the main annular part and the length “L2”of the annular coupling part.