Bluff body combustion system for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-11236711-B2
Application number	US-202017019339-A
Country	US
Kind code	B2
Filing date	Sep 13, 2020
Priority date	Apr 2, 2018
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

A combustion system for an internal combustion engine includes a cylinder wall; a cylinder head disposed at an end of the cylinder wall, an internal surface of the cylinder wall and the cylinder head defining a combustion chamber; a fuel injector having a discharge nozzle disposed within the combustion chamber and configured to discharge a fuel jet along a fuel jet axis; and a bluff body disposed within the combustion chamber, the fuel jet axis intersecting an exterior surface of the bluff body. The exterior surface defines a first aperture and a second aperture therethrough, and an interior surface of the bluff body defines a first flow passage extending from the first aperture to the second aperture. The first aperture faces away from the fuel jet axis and the second aperture faces away from the fuel injector along the fuel jet axis.

First claim

The invention claimed is:

1. A combustion system for an internal combustion engine, the combustion system comprising:
a cylinder wall;
a cylinder head disposed at an end of the cylinder wall, an internal surface of the cylinder wall and the cylinder head defining a combustion chamber;
a fuel injector having an injector tip defining a fuel discharge nozzle, the fuel discharge nozzle being disposed within the combustion chamber, the fuel discharge nozzle being configured to discharge a fuel jet along a fuel jet axis; and
a bluff body disposed within the combustion chamber and spaced apart from the fuel injector, the fuel jet axis intersecting an anterior portion of an exterior surface of the bluff body,
the exterior surface defining a first aperture and a second aperture therethrough,
an interior surface of the bluff body defining a first flow passage extending from the first aperture to the second aperture, the first flow passage being in fluid communication with the combustion chamber via each of the first aperture and the second aperture, the first flow passage being oriented transverse to the fuel jet axis.

2. The combustion system of claim 1 , wherein the exterior surface further defines a third aperture therethrough, and the internal surface defines a second flow passage extending from the third aperture to the first flow passage,
the first flow passage being in fluid communication with the combustion chamber via the second flow passage and the third aperture.

3. The combustion system of claim 2 , wherein the third aperture is located on a posterior portion of the exterior surface, the third aperture facing away from the fuel injector along the fuel jet axis.

4. The combustion system of claim 3 , wherein the second flow passage is arranged transverse to the first flow passage.

5. The combustion system of claim 3 , wherein the bluff body has a prismatic shape,
the posterior portion of the exterior surface is rectangular, and
the exterior surface tapers from the posterior portion to an apex at the anterior portion.

6. The combustion system of claim 5 , wherein the exterior surface further includes a first plane and a second plane, the apex being defined by an intersection of the first plane and the second plane,
the first plane extends from a first edge of the posterior portion to the apex,
the second plane extends from a second edge of the posterior portion to the apex, and
the first edge of the posterior portion is disposed opposite the second edge of the posterior portion.

7. The combustion system of claim 6 , wherein the exterior surface further includes a first triangular portion and a second triangular portion,
the first triangular portion extends from a third edge of the posterior portion to the apex,
the second triangular portion extends from a fourth edge of the posterior portion to the apex, and
the third edge of the posterior portion is disposed opposite the fourth edge of the posterior portion.

8. The combustion system of claim 7 , wherein the first triangular portion defines the first aperture and the second triangular portion defines the second aperture.

9. An internal combustion engine, comprising:
a cylinder wall;
a piston disposed within the cylinder wall and disposed in sliding engagement with an internal surface of the cylinder wall;
a cylinder head disposed at an end of the cylinder wall and facing the piston, the internal surface of the cylinder wall, the piston, and the cylinder head defining a combustion chamber;
a fuel injector having an injector tip defining a fuel discharge nozzle, the fuel discharge nozzle being disposed within the combustion chamber, the fuel discharge nozzle being configured to discharge a fuel jet along a fuel jet axis; and
a bluff body disposed within the combustion chamber and spaced apart from the fuel injector, the fuel jet axis intersecting an anterior portion of an exterior surface of the bluff body,
the exterior surface defining a first aperture and a second aperture therethrough,
an interior surface of the bluff body defining a first flow passage extending from the first aperture to the second aperture, the first flow passage being in fluid communication with the combustion chamber via each of the first aperture and the second aperture, the first flow passage being oriented transverse to the fuel jet axis.

10. The internal combustion engine of claim 9 , wherein the exterior surface further defines a third aperture therethrough, and the internal surface defines a second flow passage extending from the third aperture to the first flow passage,
the first flow passage being in fluid communication with the combustion chamber via the second flow passage and the third aperture.

11. The internal combustion engine of claim 10 , wherein the third aperture is located on a posterior portion of the exterior surface, the third aperture facing away from the fuel injector along the fuel jet axis.

12. The internal combustion engine of claim 11 , wherein the second flow passage is arranged transverse to the first flow passage.

13. The internal combustion engine of claim 11 , wherein the bluff body has a prismatic shape,
the posterior portion of the exterior surface is rectangular, and
the exterior surface tapers from the posterior portion to an apex at the anterior portion.

14. The internal combustion engine of claim 13 , wherein the exterior surface further includes a first plane and a second plane, the apex being defined by an intersection of the first plane and the second plane,
the first plane extends from a first edge of the posterior portion to the apex,
the second plane extends from a second edge of the posterior portion to the apex, and
the first edge of the posterior portion is disposed opposite the second edge of the posterior portion.

15. The internal combustion engine of claim 14 , wherein the exterior surface further includes a first triangular portion and a second triangular portion,
the first triangular portion extends from a third edge of the posterior portion to the apex,
the second triangular portion extends from a fourth edge of the posterior portion to the apex,
the third edge of the posterior portion is disposed opposite the fourth edge of the posterior portion, and
the first triangular portion defines the first aperture and the second triangular portion defines the second aperture.

16. A combustion system for an internal combustion engine, the combustion system comprising:
a cylinder wall;
a cylinder head disposed at an end of the cylinder wall, an internal surface of the cylinder wall and the cylinder head defining a combustion chamber;
a fuel injector having an injector tip defining a fuel discharge nozzle, the fuel discharge nozzle being disposed within the combustion chamber, the fuel discharge nozzle being configured to discharge a fuel jet along a fuel jet axis; and
a bluff body disposed within the combustion chamber and spaced apart from the fuel injector, the fuel jet axis intersecting an anterior portion of an exterior surface of the bluff body,
the exterior surface defining a first aperture and a second aperture therethrough,
the first aperture facing away from the fuel jet axis along a transverse direction, the transverse direction being transverse to the fuel jet axis,
the second aperture facing away from the fuel injector along the fuel jet axis,
an interior surface of the bluff body defining a first flow passage extending from the first aperture to the second aperture, the first flow passage being in fluid communication with the combustion chamber via each of the fir

Assignees

• Caterpillar Inc

Inventors

• Dempsey Adam
• Svensson Kenth I

Classifications

• B05B1/265

  the liquid or other fluent material being symmetrically deflected about the axis of the nozzle · CPC title

• F02B23/00 Primary

  Other engines characterised by special shape or construction of combustion chambers to improve operation (engines with incandescent chambers F02B9/08) · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title

• B05B1/267

  the liquid or other fluent material being deflected in determined directions · CPC title

• F02B23/0618

  having in-cylinder means to influence the charge motion · CPC title