Lobe mixer for jet engine

• US 20040006968A1
• Filed: 08/02/2002
• Published: 01/15/2004
• Est. Priority Date: 04/19/2001
• Status: Active Grant

• Current Assignee: Ishikawajima-Harima Heavy Industries Company Limited
• Original Assignee: Ishikawajima-Harima Heavy Industries Company Limited
• Inventors: Oishi, Tsutomu
• Granted Patent: US 6,804,948 B2
• Time in Patent Office: Days
• US Class Current: 60/262
• CPC Class Codes: F02K 1/386 mixing devices in the jet pipe, e.g. for mixing primary and secondary flow
• CPC Class Codes: F02K 1/48 Corrugated nozzles
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

A lobe mixer (22) used in jet engines, is provided with diameter expansion portions (22a) in which the diameters gradually increase in the downstream direction, in which adjacent diameter expansion portions have different diameters from each other, and which guide the core gasses that flow along the inner sides of the adjacent diameter expansion portions, peripherally outwards at different angles. Thus, the gasses are mixed without the thrust of the jet engine being reduced, and the noise of the jet is reduced.

Claims

1. In the lobe mixer (22) for jet engines, that mixes core gasses (14) passing through a compressor (3), a combustor (4) and a turbine (5) and bypass gasses (13) bypassing the devices (3, 4, 5),

the lobe mixer comprising diameter expansion portions (22a) in which the diameters gradually increase in the downstream direction and the diameter expansion portions have different angles of slopes in adjacent diameter expansion between each other.

2. In the lobe mixer (22) for jet engines, that mixes core gasses (14) passing through a compressor (3), a combustor (4) and a turbine (5) and bypass gasses (13) bypassing the devices (3, 4, 5),

the lobe mixer comprising diameter reduction portions (22b) in which the diameters thereof gradually decrease in the downstream direction and the diameter expansion portions have different angles of slopes in adjacent diameter expansion between each other.

3. In the lobe mixer (27) for jet engines, that mixes mixed gasses (26) comprising core gasses (14) passing through a compressor (3), a combustor (4) and a turbine (5), and bypass gasses (13) bypassing the devices (3, 4, 5), with air drawn into an exhaust nozzle (12) from atmosphere,

the lobe mixer comprising diameter expansion portions (27a) in which the diameters thereof gradually increase in the downstream direction and the diameter expansion portions have different angles of slopes in adjacent diameter expansion between each other.

4. In the lobe mixer (27) for jet engines, that mixes mixed gasses (26) comprising core gasses (14) passing through a compressor (3), a combustor (4) and a turbine (5), and bypass gasses (13) bypassing the devices (3, 4, 5), with air drawn into an exhaust nozzle (12) from atmosphere,

the lobe mixer comprising diameter reduction portions (22b) in which the diameters thereof gradually decrease in the downstream direction and the diameter expansion portions have different angles of slopes in adjacent diameter expansion between each other.