US 4,741,154 AGranted

Rotary detonation engine

AssigneeThe United States of America as represented by the Secretary of the Navy

InventorShmuel Eidelman

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Abstract

In an engine of the type wherein the combustion of fuel is initiated by a detonation wave, a plurality of axisymmetrical rotor elements are fixed along the length of a drive shaft. The drive shaft has a central longitudinal chamber which is supplied with the fuel mixture. Each rotor element has an annular initiation chamber which communicates with the central chamber of the shaft and a system of ducts which extend outward from the initiation chamber to exhaust openings. The initiation chambers and the associated systems of ducts are selectively filled with the fuel mixture and detonation is selectively initiated in the initiation chambers. This detonation produces detonation waves which propagate outward in the ducts resulting in the combustion products being ejected from the ducts in the form of high speed jets to produce rotational moment on the rotor/shaft unit. The speed of the exhaust jets may be modified to tailor the jet speed to the speed of rotation by varying the divergence of nozzles at the ends of the ducts or by injecting a secondary fluid into the exhaust jet.

Claims32

Dependent claims

In an engine of the type wherein the combustion of the fuel mixture is carried out by a detonation wave, the improvement comprising:

(a) an elongated shaft having a central longitudinal chamber, said chamber being supplied with a detonatable fuel mixture;
(b) a plurality of axisymmetrical elements integral with said shaft and disposed along the length thereof, each said axisymmetrical element having a central annular initiation chamber and a plurality of ducts extending outward from said initiation chamber to exhaust openings on the periphery of the axisymmetrical element, said ducts having a cross-sectional area which permits propagation of detonation waves;
(c) means for selectively introducing said detonatable mixture from said central chamber into the initiation chamber of each said axisymmetrical element and the ducts of said axisymmetrical element;
and
(d) means for selectively initiating detonation of said fuel mixture in the initiation chamber of each said axisymmetrical element, whereby ignition and detonation of fuel mixture in said initiation chamber will produce a detonation wave which travels outward from such initiation chamber in said ducts to initiate fast combustion of the fuel mixture in said ducts, the combustion products being exhausted from said exhaust openings in the form of high speed jets oriented to produce a rotational moment in said element and said shaft.

2 more elements

Dependencies are inferred from the claim text.