Enhanced turbulent mixing

Patent metadata

Field	Value
Publication number	US-2016238255-A1
Application number	US-201615044912-A
Country	US
Kind code	A1
Filing date	Feb 16, 2016
Priority date	Feb 18, 2015
Publication date	Aug 18, 2016
Grant date	—

Abstract

A flow directing apparatus for directing fluid flowing therethrough includes a flow body defining an upstream facing inlet surface and an opposed downstream facing outlet surface with a bore defined through the flow body. The bore includes an inlet portion of the bore extending in a downstream direction from an inlet where the bore meets the inlet surface. An intermediate portion of the bore extends in a downstream direction from the inlet portion of the bore. A backstep portion of the bore extends downstream from the intermediate portion of the bore to an outlet where the bore meets the outlet surface. The intermediate portion of the bore has a cross-sectional flow area that is smaller than that of the inlet portion and smaller than that of the backstep portion to provide a backward facing step in flow area for flow through the bore.

First claim

What is claimed is:

1 . A flow directing apparatus for directing fluid flowing therethrough, comprising:
a flow body defining an upstream facing inlet surface and an opposed downstream facing outlet surface with a bore defined through the flow body from the inlet surface to the outlet surface, wherein the bore is configured to direct fluid flowing therethrough and includes: an inlet portion of the bore extending in a downstream direction from an inlet where the bore meets the inlet surface; an intermediate portion of the bore extending in a downstream direction from the inlet portion of the bore; and a backstep portion of the bore extending downstream from the intermediate portion of the bore to an outlet where the bore meets the outlet surface, wherein the intermediate portion of the bore has a cross-sectional flow area that is smaller than or equal to that of the inlet portion and smaller than that of the backstep portion to provide a backward facing step in flow area for flow through the bore.

2 . A flow directing apparatus as recited in claim 1 , wherein the intermediate portion of the bore meets the backstep portion of the bore a position that is between about 20% to about 80% of a length of the bore defined from the inlet to the exit of the bore.

3 . A flow directing apparatus as recited in claim 1 , wherein the backstep portion of the bore has a cross-sectional area that is between about 40% and about 225% larger than the cross-sectional area of the intermediate portion of the bore.

4 . A flow directing apparatus as recited in claim 1 , wherein the intermediate portion of the bore is dimensioned to meter flow through the bore.

5 . A flow directing apparatus as recited in claim 1 , wherein the backstep portion includes a diffuser opening gradually downstream of the intermediate portion.

6 . A flow directing apparatus for directing fluid flowing therethrough, comprising:
a flow body defining an upstream facing inlet surface and an opposed downstream facing outlet surface with a plurality of bores defined through the blow body from the inlet surface to the outlet surface, wherein each bore is configured to direct fluid flowing therethrough and includes an inlet where the bore meets the inlet surface and an outlet where the bore meets the outlet surface, wherein each bore includes:
an inlet portion of the bore extending in a downstream direction from the inlet of the bore;
an intermediate portion of the bore extending in a downstream direction from the inlet portion of the bore; and
a backstep portion of the bore extending downstream from the intermediate portion of the bore to the outlet of the bore, wherein the intermediate portion of the bore has a cross-sectional flow area that is smaller than or equal to that of the inlet portion and smaller than that of the backstep portion to provide a backward facing step in flow area for flow through the bore.

7 . A flow directing apparatus as recited in claim 6 , wherein the flow body is a mixer and the bores are arranged circumferentially about a center axis defined by the flow body.

8 . A flow directing apparatus as recited in claim 6 , wherein each bore is aligned along a bore axis that has at least one of a tangential directional component or a converging directional component relative to a center axis defined by the flow body.

9 . A flow directing apparatus as recited in claim 6 , wherein the bores include an inner set of bores arranged circumferentially about a centerline axis defined by the flow body, and an outer set of bores arranged circumferentially about the centerline axis outboard of the inner set of bores.

10 . A flow directing apparatus as recited in claim 6 , wherein the bores are arranged circumferentially about a centerline axis defined by the flow body, and further comprising an injector mounted in the flow body along the centerline axis.

11 . A flow directing apparatus as recited in claim 6 , wherein the intermediate portion of the bore meets the backstep portion of the bore a position that is between about 20% to about 80% of a length of the bore defined from the inlet to the exit of the bore.

12 . A flow directing apparatus as recited in claim 6 , wherein the backstep portion of the bore has a cross-sectional area that is between about 40% and about 225% larger than the cross-sectional area of the intermediate portion of the bore.

13 . A flow directing apparatus as recited in claim 6 , wherein the intermediate portion of the bore is dimensioned to meter flow through the bore.

14 . A flow directing apparatus as recited in claim 6 , wherein the inlet portion of at least one of the bores includes a countersink with a larger cross-sectional area than that of the bore downstream of the countersink.

15 . A flow directing apparatus as recited in claim 6 , wherein the inlet portion of at least one of the bores includes a chamfer with a larger cross-sectional area than that of the bore downstream of the countersink.

Assignees

• Delavan Inc

Inventors

• Ryon Jason A
• Buelow Philip E
• Prociw Lev A

Classifications

• F23D11/107

  at least one of both being subjected to a swirling motion · CPC title

• F02C7/232

  Fuel valves {(control of fuel supply by means of fuel metering valves F02C9/263)}; Draining valves or systems (valves in general F16K) · CPC title

• F05D2220/32

  in gas turbines · CPC title

• F23R3/286 Primary

  having fuel-air premixing devices (F23R3/30 takes precedence) · CPC title

• B05B7/10 Primary

  producing a swirling discharge · CPC title