Robert Scott Field

US Patent:

57998744, Sep 1, 1998

Filed:

Nov 30, 1995

Appl. No.:

8/565600

Inventors:

Daniel E. Eigenbrode - Hobe Sound FL
Robert E. Field - Sycamore IL

Assignee:

United Technologies Corporation - Hartford CT

International Classification:

B64D 3304

US Classification:

2391271

Abstract:

The supersonic ejector utilized for cooling includes a cooling extension axially extending the discharge slot from the throat of the primary stream and is contoured to accelerate primary stream, to direct the primary stream to flow parallel to the secondary stream and match the static pressures of both streams and to ensure that the expansion shocks are upstream of the discharge slot. This supersonic ejector is utilized in one instance for cooling purposes in a two-dimensional vectoring nozzle of a gas turbine engine powering aircraft.

US Patent:

46843230, Aug 4, 1987

Filed:

Dec 23, 1985

Appl. No.:

6/812104

Inventors:

Robert E. Field - Tequesta FL

Assignee:

United Technologies Corporation - Hartford CT

International Classification:

F01D 518

US Classification:

416 97R

Abstract:

A film cooling passage through the external wall of a hollow airfoil for a gas turbine engine has a metering section in series flow relation with a diffusing section leading to the passage outlet at the external surface of the airfoil over which a hot gas flows during operation. The diffusing section is generally rectangular in cross section perpendicular to the axis of the passage. Upstream and downstream longitudinally extending, spaced apart, facing surfaces of the diffusing section are joined together by a pair of spaced apart side walls which face each other and diverge from each other in the longitudinal direction toward the outlet of the passage. These side walls blend, along their length, with the downstream surface as a smooth curve of large radius. The diameter of the corner curvature of the passage is on the same order of magnitude as the distance between the upstream and downstream surfaces of the diffusing section at the location in question. The large corner curvatures, as opposed to filet radii, allow the side walls to diverge from each other at a greater angle without separation of the coolant fluid therefrom, permitting the spreading of smaller amounts of coolant air over a larger area of the airfoil external surface.

US Patent:

47267356, Feb 23, 1988

Filed:

Dec 23, 1985

Appl. No.:

6/812100

Inventors:

Robert E. Field - Tequesta FL
James S. Phillips - Jupiter FL

Assignee:

United Technologies Corporation - Hartford CT

International Classification:

F01D 518

US Classification:

416 97R

Abstract:

The wall of a hollow airfoil for a gas turbine engine includes a film cooling slot therein elongated in the longitudinal direction and having a base within the wall and an outlet at the external surface of the airfoil. A plurality of metering passages extend from inlets at the internal surface of the wall and intersect the slot near its base. The metering passages are angled to direct a metered flow of coolant fluid at a sharp angle against a surface of the slot to cause turbulence and diffusion of the coolant fluid within the slot in order that the coolant fluid fill the entire slot. The coolant fluid thereupon exits the slot as a thin film over the surface of the airfoil downstream of the slot outlet along the full length of the slot.

US Patent:

46699570, Jun 2, 1987

Filed:

Dec 23, 1985

Appl. No.:

6/812102

Inventors:

James S. Phillips - Jupiter FL
Robert E. Field - Tequesta FL

Assignee:

United Technologies Corporation - Hartford CT

International Classification:

F01D 518

US Classification:

416 97R

Abstract:

The wall of a hollow turbine airfoil has a longitudinally extending coolant outlet slot in its external surface which intersects, along its length, a longitudinally extending cylindrical channel within the wall. Metering passages extend from the inside surface of the airfoil wall to the cylindrical channel and direct a metered amount of coolant into the channel in a manner which results in a swirling motion being imparted to the fluid as the fluid diffuses within the channel. The coolant is thereupon ejected from the channel through the slot in the external surface as a film on the external surface of the airfoil along the length of the slot. The swirling of the fluid within the cylindrical channel helps diffuse the fluid such that the outlet slot becomes completely filled with coolant, whereby a film of coolant is created on the airfoil surface downstream of the slot over the full length of the slot.

US Patent:

46509496, Mar 17, 1987

Filed:

Dec 23, 1985

Appl. No.:

6/812096

Inventors:

Robert E. Field - Tequesta FL

Assignee:

United Technologies Corporation - Hartford CT

International Classification:

B23H 104
B23H 910

US Classification:

219 69E

Abstract:

A sheet metal electrode for forming a shaped, diffusing film coolant passage has a straight, longitudinally extending forward section forming an acute angle with a flat middle section, which, in turn, extends from a rear section which is the base of the electrode. The middle section includes a pair of edges rearwardly diverging from the longitudinal direction and from which extend side walls substantially perpendicular to the middle section. Longitudinally extending edges of the side walls are in the same plane as a lower, flat surface of the forward section such that the surface of the passage formed by such lower surface of the forward section is in the same plane as a surface of the diffusing portion of the passage which is formed by the longitudinally extending edges of the side walls.

US Patent:

51447959, Sep 8, 1992

Filed:

May 14, 1991

Appl. No.:

7/700369

Inventors:

Robert E. Field - Tequesta FL

Assignee:

The United States of America as represented by the Secretary of the Air
Force - Washington DC

International Classification:

F02K 302
B64D 3304

US Classification:

602261

Abstract:

Liner structure for a duct carrying a heated fluid is described which comprises a substantially cylindrically shaped wall member having a corrugated inner surface contour defining a first plurality of axially extending ridges defined between a corresponding plurality of axial grooves, a second plurality of axially spaced vee-shaped vanes disposed on each ridge with the legs of each vane divergent toward the downstream end of the duct, an elongated cap disposed along each ridge atop corresponding vanes and defining a corresponding plurality of slots between each cap and ridge, and a third plurality of holes through the wall member at each ridge between axially adjacent vanes for conducting fluid coolant through the wall member.

US Patent:

46727272, Jun 16, 1987

Filed:

Dec 23, 1985

Appl. No.:

6/812098

Inventors:

Robert E. Field - Tequesta FL

Assignee:

United Technologies Corporation - Hartford CT

International Classification:

B21K 304
B23P 1502

US Classification:

291568B

Abstract:

In the fabrication of a hollow airfoil having a longitudinally extending slot in the airfoil wall with the slot outlet at the external surface of the airfoil, a metering passage extending from the coolant compartment within the airfoil to the slot for carrying a metered amount of coolant fluid into the slot is formed by machining a passage completely through the wall from the external surface to the internal surface and which intersects the slot. The portion of the passage between the slot and the external surface of the airfoil is blocked, such as with a plug or by welding. With this fabrication method metering passages for directing coolant fluid from inside the airfoil into the slot may be formed without access to the interior of the airfoil. Coolant fluid from the interior flows into the slot through the unblocked portion of the passage and thereupon flows out of the airfoil through the slot as a film of coolant over the surface of the airfoil.