Patents by Inventor Jack R. Shekleton
Jack R. Shekleton has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6178751Abstract: The liquid fuel injector includes continuous air assist with both the liquid fuel injector tube and the surrounding air assist tube constrained or reduced in diameter at the discharge ends thereof. The associated gas turbine engine compressor provides combustion air to the combustor and also air for continuous air assist with a separate air pump. The air assist air may be cooled in a heat exchanger either before or after the separate air pump. The liquid fuel injector may be mounted within an annular air blast tube and directed tangentially at the inner wall of the combustor. A solenoid valve controlled purge line, together with solenoid valves in the liquid fuel and air assist lines can be utilized to purge any liquid fuel in the liquid fuel injector and manifold upon shutdown of the combustor. The liquid fuel injector can also be insulated and liquid fuel can be used to cool the fuel injector.Type: GrantFiled: July 19, 1999Date of Patent: January 30, 2001Assignee: Capstone Turbine CorporationInventors: Jack R. Shekleton, Curtis C Martin
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Patent number: 6082112Abstract: The liquid fuel injector includes continuous air assist with both the liquid fuel injector tube and the surrounding air assist tube constrained or reduced in diameter at the discharge ends thereof. The associated gas turbine engine compressor provides combustion air to the combustor and also air for continuous air assist with a separate air pump. The air assist air may be cooled in a heat exchanger either before or after the separate air pump. The liquid fuel injector may be mounted within an annular air blast tube and directed tangentially at the inner wall of the combustor. A solenoid valve controlled purge line, together with solenoid valves in the liquid fuel and air assist lines can be utilized to purge any liquid fuel in the liquid fuel injector and manifold upon shutdown of the combustor. The liquid fuel injector can also be insulated and liquid fuel can be used to cool the fuel injector.Type: GrantFiled: July 19, 1999Date of Patent: July 4, 2000Assignee: Capstone Turbine CorporationInventor: Jack R. Shekleton
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Patent number: 6065281Abstract: The liquid fuel injector includes continuous air assist with both the liquid fuel injector tube and the surrounding air assist tube constrained or reduced in diameter at the discharge ends thereof. The associated gas turbine engine compressor provides combustion air to the combustor and also air for continuous air assist with a separate air pump. The air assist air may be cooled in a heat exchanger either before or after the separate air pump. The liquid fuel injector may be mounted within an annular air blast tube and directed tangentially at the inner wall of the combustor.A solenoid valve controlled purge line, together with solenoid valves in the liquid fuel and air assist lines can be utilized to purge any liquid fuel in the liquid fuel injector and manifold upon shutdown of the combustor. The liquid fuel injector can also be insulated and liquid fuel can be used to cool the fuel injector.Type: GrantFiled: July 19, 1999Date of Patent: May 23, 2000Assignee: Capstone Turbine CorporationInventors: Jack R. Shekleton, Curtis C. Martin
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Patent number: 5966926Abstract: The liquid fuel injector includes continuous air assist with both the liquid fuel injector tube and the surrounding air assist tube constrained or reduced in diameter at the discharge ends thereof The associated gas turbine engine compressor provides combustion air to the combustor and also air for continuous air assist with a separate air pump. The air assist air may be cooled in a heat exchanger either before or after the separate air pump. The liquid fuel injector may be mounted within an annular air blast tube and directed tangentially at the inner wall of the combustor. A solenoid valve controlled purge line, together with solenoid valves in the liquid fuel and air assist lines can be utilized to purge any liquid fuel in the liquid fuel injector and manifold upon shutdown of the combustor. The liquid fuel injector can also be insulated and liquid fuel can be used to cool the fuel injector.Type: GrantFiled: May 28, 1997Date of Patent: October 19, 1999Assignee: Capstone Turbine CorporationInventors: Jack R. Shekleton, Curtis C. Martin
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Patent number: 5927066Abstract: In a gas turbine engine having gaseous oxidant delivered to a turbine from a source such as a pressurized bottle via a conduit or duct, a compact annular combustor is provided which offers enhanced performance through incorporation of means for uniformly distributing portions of the oxidant utilized as a diluent, and for convective cooling of engine components.Type: GrantFiled: November 24, 1992Date of Patent: July 27, 1999Assignee: Sundstrand CorporationInventors: Jack R. Shekleton, Colin Rodgers
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Patent number: 5577380Abstract: A gas turbine engine 10 having a rotor 12 with turbine blades 14 and a nozzle 16 adjacent the turbine blades 14 for directing hot gases of combustion at the turbine blades 14. The engine 10 also includes an annular combustor 18 about the rotor 12 and an annular combustor housing 30 substantially surrounding the combustor 18 in generally concentric spaced relation. A fuel injection system is operatively associated with the combustor 18 for injecting fuel into a combustion space 28 to be combusted with air from a compressor 34. The fuel injection system may include a plurality of circumferentially spaced fuel injectors 68 disposed in an outer wall 20 of the combustor 18 together with a generally oval shaped manifold 70 in fluid communication with a primary fuel source and the fuel injectors 68. A turbine shroud 36 is provided to extend radially outward from the rotor to the outer wall of the combustor on the side of the nozzle 16 opposite the combustion space 28.Type: GrantFiled: February 6, 1995Date of Patent: November 26, 1996Assignee: Sundstrand CorporationInventors: Jack R. Shekleton, Melvin K. Lafferty
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Patent number: 5456080Abstract: A turbine engine (10) includes a turbine wheel (12) coupled to a compressor (14) for driven movement, a nozzle (16) for directing gases of combustion at the turbine wheel (12), and an annular combustor (18) defining an annular combustion space upstream of the turbine wheel (12) in fluid communication with both the compressor (14) and the nozzle (16). The combustor (18) receives fuel from a source and air from the compressor (14) and combusts them in the combustion space to generate the gases of combustion. The combustor (18) is defined by an annular outer wall (20), an annular inner wall (22), and a radial wall (24) extending therebetween opposite the nozzle (16). The turbine engine (10) also includes at least one air blast fuel injector (26) disposed in the annular outer wall (20) of the combustor (18) for injecting atomized fuel generally tangentially of the outer wall (20) outwardly of a flame zone (28) within the combustion space.Type: GrantFiled: January 7, 1994Date of Patent: October 10, 1995Assignee: Sundstrand CorporationInventor: Jack R. Shekleton
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Patent number: 5363644Abstract: The expense of fabricating an annular combustor (10) for a gas turbine is minimized by providing a combustor housing (12) including a generally axially extending sleeve (14) and an annular liner (18) disposed within the housing (12) and about the sleeve (14). The annular liner (18) has concentric inner and outer axially extending walls (20, 22) spaced from the sleeve (14 ) and the housing (12), respectively, and also has a radially extending wall (24) spaced from the housing (12 ) and interconnecting the inner and outer walls (20, 22) at one end to define a combustion chamber (26). The liner (18) is spaced from the housing (12 ) and the sleeve (14 ) to define a compressed air flow path (28) extending from a radially outer compressed air inlet (30) to a radially inner compressed air outlet (32) in communication with the combustion chamber (26) axially remote from the radially extending wall (24).Type: GrantFiled: December 21, 1989Date of Patent: November 15, 1994Assignee: Sundstrand CorporationInventors: Jack R. Shekleton, William D. Treece
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Patent number: 5343690Abstract: Difficulties in starting a turbine engine, particularly ones having a small volume combustor (83) with a low dome height, may be avoided by a method including the steps of a) forming the turbine engine compressor (48) of a low density, high temperature resistant ceramic material, b) directing pyrotechnic gases at a temperature of at least about 3,000.degree. F. against the blades (48) of the compressor, c) continuing the step of directing until the turbine rotor (44) is rotating at at least about 60 percent of rated speed and d) combusting fuel in the combustor (83) of the turbine engine to maintain the rotor (44) rotating at at least about 60 percent of rated speed.Type: GrantFiled: March 16, 1993Date of Patent: September 6, 1994Assignee: Sundstrand CorporationInventors: Jack R. Shekleton, Colin Rodgers
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Patent number: 5331803Abstract: Undesirable high temperature gradients associated with inadequate mixing of dilution air with gases of combustion in turbines is avoided in a structure wherein dilution air is injected with a high degree of circumferential swirl through an opening (50) to the interior of an annular combustor (20) at the outlet (36) thereof which is connected to a turbine nozzle (46). The high circumferential swirl generates high "g" forces causing rapid penetration of the dilution air in the radial direction through the combustion air stream and the length of the path of the combined stream, and thus residence time and thoroughness of mixing, can be controlled through the use of a baffle (60) overlying the opening (50) to direct the dilution air countercurrently to the gases of combustion prior to introduction into the stream thereof.Type: GrantFiled: July 24, 1989Date of Patent: July 26, 1994Assignee: Sundstrand CorporationInventor: Jack R. Shekleton
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Patent number: 5321950Abstract: In order to achieve ignition at altitude, particularly in relatively small combustors (10) with low fuel flow rates, a fuel injection system (20) includes an air nozzle (26), a fuel nozzle (28), and an air assist tube (34). The fuel nozzle (28) is disposed in a manner so as to direct fuel through the air nozzle (26) and includes a fuel metering orifice (30) or capillary tube (32) to control fuel flow therethrough. The air assist tube (34) is integrally associated with the fuel nozzle (28) downstream of the fuel metering orifice (30) or capillary tube (32) to accelerate fuel flowing through the fuel nozzle (28).Type: GrantFiled: October 9, 1991Date of Patent: June 21, 1994Assignee: Sundstrand CorporationInventors: Jack R. Shekleton, Michael W. Sledd, Steven A. Sachrison
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Patent number: 5317864Abstract: Difficulties in downsizing annular combustors (20) due to orienting fuel injectors with respect to oxidant blast tubes are avoided in a construction for a combustor (20) including radially spaced annular walls (22, 24) and an interconnecting radial wall (26) defining an annular combustion chamber (32). A plurality of circumferentially spaced tubes (28, 30) extend through the radially outermost annular wall (24) and are directed generally tangentially into the combustion space (32). A plurality of fuel injectors (42) are provided for directing fuel radially inwardly into the space (32) and are circumferentially spaced about the combustion space (32) and located between the tubes (28).Type: GrantFiled: September 30, 1992Date of Patent: June 7, 1994Assignee: Sundstrand CorporationInventors: Linn C. Shorb, Michael W. Sledd, Jack R. Shekleton
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Patent number: 5307636Abstract: A hot gas generator includes a dual fuel injector (42) having spaced fuel discharge nozzles (48, 60) on the longitudinal axis (28) of a vessel (18) having a narrow inlet (22), an opposite narrow outlet (14) and an intermediate, enlarged chamber (24) which serves as a combustion chamber. The nozzle (60) injects a spray cone (64) of fuel in a cone angle that is sufficiently wide that a large angle exists between the fuel spray and the path (54) of high velocity combustion gases moving toward the outlet (14) to achieve excellent vaporization of fuel at fuel rich conditions without causing carbon buildup and/or the generation of black smoke in the exhaust.Type: GrantFiled: January 10, 1992Date of Patent: May 3, 1994Assignee: Sundstrand CorporationInventors: Jack R. Shekleton, Robert W. Smith
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Method for preventing lean flaeout at ignition of a stored energy system for driving a turbine wheel
Patent number: 5305596Abstract: Lean flameout upon ignition in a turbine system including a turbine wheel (10) driven by motive gases including gases of combustion from a combustor (20) may be avoided by locating an orifice (130) downstream of the servo/.DELTA.P valve (52) that controls fuel flow to the fuel inlet (22) of the combustor (20).Type: GrantFiled: October 21, 1992Date of Patent: April 26, 1994Assignee: Sundstrand CorporationInventors: Steven Lampe, Timothy David, Jack R. Shekleton -
Annular combustor for a turbine engine with tangential passages sized to provide only combustion air
Patent number: 5303543Abstract: Problems with the cooling of a turbine nozzle (60) and a turbine wheel (20) of a gas turbine engine when the engine is uprated may be avoided or minimized by employing a combustor (36) that is free of any means for providing cooling air films on the interior walls thereof and which allows the entry of only stoichiometric quantities of air into the interior of the combustor (36) at predetermined locations along the entire axial length thereof. Consequently, the entirety of the combustor (36) is available for combustion. Cooling of the nozzle (60) and components of the engine downstream thereof is handled by the provision of an annular array of small openings (102) immediately upstream of the leading edges (98) of the vanes (58) constituting the nozzle (60) to provide excellent mixing of dilution air and combustion gases thereat.Type: GrantFiled: February 8, 1990Date of Patent: April 19, 1994Assignee: Sundstrand CorporationInventors: Nipulkumar Shah, Jack R. Shekleton -
Patent number: 5277021Abstract: In order to facilitate enhanced starting of gas turbines at very high altitudes where the cost must be low and the design must be simple, a turbine engine (10) is disclosed. It includes a turbine wheel (12) coupled to a compressor (14) for driven movement, a nozzle (16) for directing gases of combustion at the turbine wheel 12), and an annular combustor (18) defining an annular combustion space upstream of the turbine wheel (12) in fluid communication with both the compressor (14) and the nozzle (16). The combustor (18) receives fuel from a source and air from the compressor (14) and combusts them in the combustion space to generate the gases of combustion. The combustor (18) is defined by an annular outer wall (20), an annular inner wall (22), and a radial wall (24) extending therebetween opposite the nozzle (16).Type: GrantFiled: May 13, 1991Date of Patent: January 11, 1994Assignee: Sundstrand CorporationInventor: Jack R. Shekleton
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Patent number: 5277022Abstract: In order to enhance fuel injection efficiency, and particularly to atomize low fuel flows at high velocity with low fuel pressure, a fuel injection system 24 for a combustor 22 of a turbine engine 20 has an air blast tube 48 and a fuel supply tube 76. The air blast tube 48 is mounted at an acute angle relative to a wall 26 of the combustor 22 and has a first end 50 in communication with the combustor 22 and a second, enlarged end 52 disposed at an acute angle to an axis 54 of the air blast tube 48 in communication with a source of compressed air externally of the wall 26 of the combustor 22. The air blast tube 48 is operable to deliver compressed air from the source into the combustor 22.Type: GrantFiled: October 23, 1992Date of Patent: January 11, 1994Assignee: Sundstrand CorporationInventors: Jack R. Shekleton, Michael W. Sledd
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Patent number: 5265407Abstract: Difficulties in controlling the flow of oxidant to a combustor (10) in a stored energy system for driving a gas turbine (16) resulting from Joule-Thompson cooling of the oxidant are avoided in a system wherein a hot gas distributor (50, 50', 60) is disposed within an oxidant storage vessel (40, 60) to add heat to gases near the outlet (42) of the bottle (40, 60) as a result of the firing of a squib (54) in fluid communication therewith. The heating of the gases at the outlet (42) raises the temperature of the oxidant sufficiently to offset Joule-Thompson cooling.Type: GrantFiled: June 22, 1990Date of Patent: November 30, 1993Assignee: Sundstrand CorporationInventor: Jack R. Shekleton
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Patent number: 5263315Abstract: Difficulties in starting a turbine engine, particularly ones having a small volume combustor (83) with a low dome height, may be avoided by a method including the steps of a) forming the turbine engine compressor (48) of a low density, high temperature resistant ceramic material, b) directing pyrotechnic gases at a temperature of at least about 3,000.degree. F. against the blades (48) of the compressor, c) continuing the step of directing until the turbine rotor (44) is rotating at at least about 60 percent of rated speed and d) combusting fuel in the combustor (83) of the turbine engine to maintain the rotor (44) rotating at at least about 60 percent of rated speed.Type: GrantFiled: November 9, 1990Date of Patent: November 23, 1993Assignee: Sundstrand Corp.Inventors: Jack R. Shekleton, Colin Rodgers
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Patent number: RE34962Abstract: The combustion dynamics and efficiency of gas turbine having an annular combustor 26 provided with fuel injection nozzles 50 that inject fuel generally tangentially is improved by providing the walls 32, 34, 39 of the combustion 26 with cooling air film injectors 70, 86; 72, 88; 74, 90 at substantially equally angularly spaced locations about each such wall and which are oriented to generally tangentially inject a film-like air stream on the associated wall 32, 34, 39.Type: GrantFiled: May 29, 1992Date of Patent: June 13, 1995Assignee: Sundstrand CorporationInventors: Jack R. Shekleton, Colin Rodgers, John P. Archibald, Robert W. Smith