Supersonic aircraft and method of reducing sonic booms and jet noise
AssigneeJapan Aerospace Exploration Agency
InventorJunichi AKATSUKA
Life of this patent
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Abstract
Provided is a supersonic aircraft including: a shield that shields an engine exhaust flow discharged from a jet engine accommodated in an engine nacelle mounted on a fuselage of the aircraft to thereby reduce sonic booms due to the engine exhaust flow; and an exhaust nozzle that is provided in an exhaust port of the engine nacelle and that generates a sound source for high-frequency components at a position at which the shield is capable of shielding the high-frequency components of the engine exhaust flow, to thereby reduce jet noise having the high-frequency components, and promotes mixing of the engine exhaust flow that generates low-frequency noise components with an external air flow to thereby reduce jet noise having the low-frequency components.
Claims20
A supersonic aircraft, comprising:
- a shield that shields an engine exhaust flow discharged from a jet engine accommodated in an engine nacelle mounted on a fuselage of the aircraft to thereby reduce sonic booms due to the engine exhaust flow;
- and
- an exhaust nozzle that is provided in an exhaust port of the engine nacelle and that generates a sound source for high-frequency components at a position at which the shield is capable of shielding the high-frequency components of the engine exhaust flow, to thereby reduce jet noise having the high-frequency components, and promotes mixing of the engine exhaust flow that generates low-frequency noise components with an external air flow to thereby reduce jet noise having the low-frequency components.
A method of reducing sonic booms and jet noise, comprising:
- shielding, by a shield, an engine exhaust flow discharged from a jet engine accommodated in an engine nacelle mounted on a fuselage of an supersonic aircraft to thereby reduce sonic booms due to the engine exhaust flow;
- and
- generating, by an exhaust nozzle that is provided in an exhaust port of the engine nacelle, a sound source for high-frequency components at a position at which the shield is capable of shielding the high-frequency components of the engine exhaust flow, to thereby reduce jet noise having the high-frequency components, and promotes mixing of the engine exhaust flow that generates low-frequency noise components with an external air flow to thereby reduce jet noise having the low-frequency components.
Dependencies are inferred from the claim text.