Patent ID: 9476399
Filing Date: 2016-10-25
CPC Classification: F02C,F02K,F02P

Claim Text:
1. A hot surface acoustic resonance igniter comprising: a source of compressed gas having a molecular weight of about 2 to 4; a sonic gas nozzle defining an opening and a nozzle axis, the gas nozzle connected to the source of compressed gas; a structure supported with respect to the gas nozzle, wherein portions of the structure define a cavity which is configured to form a resonance cavity having an opening in the upper surface which is spaced from the gas nozzle along the nozzle axis, the structure forming a lower surface of the resonance cavity, which is arranged to be heated by gas from the source of compressed gas which is driven to resonate by being emitted from the sonic nozzle; a primary combustion chamber defined below the lower surface of the resonance cavity, the primary combustion chamber connected to a source of propellant; a secondary combustion chamber separated from the primary combustion chamber by a flow channel, the secondary combustion chamber in combustion gas receiving relation to the primary combustion chamber, the secondary combustion chamber having an elongated chamber wall along which combustion products flow; and portions of the combustion chamber elongated chamber wall forming secondary propellant injection ports, arranged at least in part tangential to the chamber wall to form a cooling layer of propellant along the combustion chamber wall.