PROBLEM TO BE SOLVED: To provide a jet flow exhaust nozzle having a projecting portion for reducing noise, capable of being formed by press-molding while keeping noise reduction effect.;SOLUTION: In an annular jet flow exhaust nozzle having a projecting portion formed by making a part of an edge region at an injection end side project toward a nozzle center, the projecting portion has a ridge portion gradually approaching the nozzle center from an upstream side to a downstream side in a flowing direction of the jet flow, and a side wall portion connecting between an external region of the projecting portion and the ridge portion in a circumferential direction of the jet flow nozzle and connected to the external region while curved. When observed from the flowing direction of the jet flow, a radius of curvature of a connection part with the external region, of the side wall portion is gradually increased from an injection end toward the upstream side.;SELECTED DRAWING: Figure 3;COPYRIGHT: (C)2017,JPO&INPIT
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