# US 8,782,896 B2 · Method for the manufacture of an ejector nozzle tube

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- Number: US 8,782,896 B2
- Document ID: US8782896B2
- Status: Granted
- Kind: B2
- Application number: 12/566,803
- Filed: 2009-09-25
- Published: 2010-09-09
- Granted: 2014-07-22
- Earliest claimed: 2009-03-03
- Assignees: Rolls-Royce Deutschland Ltd & Co KG
- Applicants: Predrag Todorovic
- Inventors: Predrag Todorovic
- Web page: https://patentgrep.com/patent/US8782896B2

## CPC

- F02K 1/36: having an ejector
- B21D 51/06: folded objects
- B21D 51/10: conically or cylindrically shaped objects
- B21D 53/06: of metal tubes
- B64D 33/10: Radiator arrangement
- F01D 25/12: Cooling
- F01D 25/18: Lubricating arrangements (of machines or engines in general F01M)
- F05D 2250/18: patterned
- F05D 2250/181: ridged
- F05D 2250/182: crenellated, notched
- F05D 2250/183: zigzag
- F05D 2250/184: sinusoidal
- F05D 2260/20: Heat transfer, e.g. cooling
- F05D 2260/601: using an ejector or a jet pump
- Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft
- Y10T 29/49366: Sheet joined to sheet
- Y10T 29/49401: Fluid pattern dispersing device making, e.g., ink jet
- Y10T 29/49428: Gas and water specific plumbing component making
- Y10T 29/49432: Nozzle making
- F02K: JET-PROPULSION PLANTS (features of jet-propulsion plants common to gas-turbine plants, air intakes or fuel supply control of air-breathing jet-propulsion plants F02C7/00, F02C9/00)
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)
- B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method for manufacturing an ejector nozzle tube, includes forming an essentially rectangular plate-type blank 1 to have an undulating configuration on two opposite edge areas 2, 3, subsequently bending the blank around an axis 4, which is arranged centrically and parallel to the edge areas 2, 3, with the edge areas 2, 3 being superposed and subsequently joining the edge areas by point connections 6, providing for the formation of ejector nozzles 5 between the point connections.

## Claims

### Claim 1

A method for manufacturing and using an ejector nozzle tube, comprising:
forming an essentially rectangular sheet blank to have an undulating configuration on each of two opposite edge areas;
forming the undulated opposite edge areas with different geometries relative to each other;
subsequently bending the sheet around an axis, which is arranged centrally and parallel to the edge areas to superpose the edge areas to form an exterior surface having an aerodynamic drop shaped cross-section having a rounded inflow side and a flattened ejector side; and
subsequently joining portions of the superposed edge areas which converge toward each other with point connections to form ejector nozzles between the point connections from portions of the superposed edge areas which diverge from each other to form the elector nozzle tube;
wherein the different geometries form ejector nozzles having exit directions offset with respect to each other;
positioning the ejector nozzle tube in a flow duct of a heat exchanger and passing a main flow through the flow duct and around the aerodynamic drop shaped exterior surface from the rounded inflow side to the flattened ejector side;
introducing a secondary flow through the ejector nozzles into the main flow duct at a higher velocity than a velocity of the main flow to accelerate the main flow.

### Claim 2 (depends on 1)

The method of claim 1, and further comprising forming a center bending area to have a part-circular cross-section.

### Claim 3 (depends on 2)

The method of claim 2, wherein the edge areas each have a trailing edge which is chosen from a rectilinear trailing edge and an undulated trailing edge.

### Claim 4 (depends on 2)

The method of claim 2, wherein the edge areas are structured.

### Claim 5 (depends on 1)

The method of claim 1, wherein the ejector nozzles are arranged in rows which are offset relative to each other and with respect to the axis.

### Claim 6 (depends on 1)

The method of claim 1, wherein the edge areas each have a trailing edge which is chosen from a rectilinear trailing edge and an undulated trailing edge.

### Claim 7 (depends on 1)

The method of claim 1, wherein the edge areas are structured.

### Claim 8 (depends on 1)

The method of claim 1, wherein the joining step is by welding.

### Claim 9 (depends on 2)

The method of claim 2, and further comprising forming a direct path between the center bending area and exits of the ejector nozzles.

### Claim 10 (depends on 2)

The method of claim 2, wherein the ejector nozzle tube is used in a flow duct of a heat exchanger.

### Claim 11

A method for manufacturing and using an ejector nozzle tube, comprising:
forming an essentially rectangular sheet blank to have an undulating configuration on each of two opposite edge areas;
forming the undulated opposite edge areas with different geometries relative to each other;
subsequently bending the sheet around an axis, which is arranged centrally and parallel to the edge areas to superpose the edge areas; and
subsequently joining portions of the superposed edge areas which converge toward each other with point connections to form ejector nozzles between the point connections from portions of the superposed edge areas which diverge from each other to form the ejector nozzle tube,
wherein the ejector nozzle forms an open area open to an interior of the ejector nozzle tube for a secondary flow from the ejector nozzle tube, the open area for the secondary flow occupying substantially all of a length of the superposed edge area;
wherein the different geometries form ejector nozzles having exit directions offset with respect to each other; and
positioning the ejector nozzle tube in a flow duct of a heat exchanger and passing a main flow through the flow duct and around an exterior surface of the ejector nozzle tube.

### Claim 12

A method for manufacturing and using an ejector nozzle tube, comprising:
forming an essentially rectangular sheet blank to have an undulating configuration on each of two opposite edge areas;
forming the undulated opposite edge areas with different geometries relative to each other;
subsequently bending the sheet around an axis, which is arranged centrally and parallel to the edge areas to superpose the edge areas; and
subsequently joining portions of the superposed edge areas which converge toward each other with point connections to form ejector nozzles between the point connections from portions of the superposed edge areas which diverge from each other, respective planes tangent to the point connections being non-parallel, to form the ejector nozzle tube;
wherein the different geometries form ejector nozzles having exit directions offset with respect to each other; and
positioning the ejector nozzle tube in a flow duct of a heat exchanger and passing a main flow through the flow duct and around an exterior surface of the ejector nozzle tube.