Patents by Inventor David Graham Holmes
David Graham Holmes 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: 9097258Abstract: The present invention provides novel supersonic compressors comprising novel supersonic compressor rotors. The supersonic compressor rotors are designed to operate at very high rotational speed wherein the velocity of the gas entering the supersonic compressor rotor is greater than the local speed of sound in the gas, hence the descriptor “supersonic”. The new supersonic compressors comprise at least one supersonic compressor rotor defining an inner cylindrical cavity and an outer rotor rim and at least one radial flow channel allowing fluid communication between the inner cylindrical cavity and the outer rotor rim, said radial flow channel comprising a supersonic compression ramp. The novel supersonic compressor rotors are expected to enhance the performance of supersonic compressors comprising them, and to provide for greater design versatility in systems comprising such novel supersonic compressors.Type: GrantFiled: June 25, 2009Date of Patent: August 4, 2015Assignee: General Electric CompanyInventors: Douglas Carl Hofer, Zachary William Nagel, David Graham Holmes
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Patent number: 8668446Abstract: A supersonic compressor rotor. The supersonic compressor rotor includes a rotor disk that includes an upstream surface, a downstream surface, and a radially outer surface that extends generally axially between the upstream surface and the downstream surface. The radially outer surface includes an inlet surface, an outlet surface, and a transition surface that extends between the inlet surface and the outlet surface. A plurality of vanes are coupled to the radially outer surface. Adjacent vanes form a pair and are oriented such that a flow channel is defined between each pair of adjacent vanes. The flow channel extends between an inlet opening and an outlet opening. The inlet surface defines an inlet plane that extends between the inlet opening and the transition surface. The outlet surface defines an outlet plane that extends between the outlet opening and the transition surface that is not parallel to the inlet plane.Type: GrantFiled: August 31, 2010Date of Patent: March 11, 2014Assignee: General Electric CompanyInventors: Douglas Carl Hofer, Zachary William Nagel, David Graham Holmes
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Publication number: 20120156015Abstract: A supersonic compressor includes a fluid inlet and a fluid outlet, a fluid conduit extending therebetween, and a supersonic compressor rotor disposed within the fluid conduit. The rotor includes at least one rotor disk that includes a substantially cylindrical body extending between a radially inner and outer surface and a plurality of vanes coupled to the body that extend radially outward from the rotor disk and adjacent vanes form a pair of vanes. The rotor disk further includes a shroud extending about at least a portion of the rotor disk. The shroud is coupled to at least a portion of each of the plurality of vanes. The radially outer surface, the pair of adjacent vanes, and the shroud are oriented such that a fluid flow channel is defined therebetween. The rotor disk also includes a plurality of adjacent supersonic compression ramps positioned within the fluid flow channel.Type: ApplicationFiled: December 17, 2010Publication date: June 21, 2012Inventors: Ravindra Gopaldas Devi, Douglas Carl Hofer, Zachary William Nagel, David Graham Holmes
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Patent number: 8137054Abstract: A novel supersonic compressor is provided by the present invention. In one embodiment, the novel supersonic compressor comprises a fluid inlet, a fluid outlet, and at least two counter rotary supersonic compressor rotors, said supersonic compressor rotors being configured in series such that an output from a first supersonic compressor rotor having a first direction of rotation is directed to a second supersonic compressor rotor configured to counter-rotate with respect to the first supersonic compressor rotor.Type: GrantFiled: December 23, 2008Date of Patent: March 20, 2012Assignee: General Electric CompanyInventors: Douglas Carl Hofer, Zachary William Nagel, David Graham Holmes
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Publication number: 20120051933Abstract: A supersonic compressor rotor. The supersonic compressor rotor includes a rotor disk that includes an upstream surface, a downstream surface, and a radially outer surface that extends generally axially between the upstream surface and the downstream surface. The radially outer surface includes an inlet surface, an outlet surface, and a transition surface that extends between the inlet surface and the outlet surface. A plurality of vanes are coupled to the radially outer surface. Adjacent vanes form a pair and are oriented such that a flow channel is defined between each pair of adjacent vanes. The flow channel extends between an inlet opening and an outlet opening. The inlet surface defines an inlet plane that extends between the inlet opening and the transition surface. The outlet surface defines an outlet plane that extends between the outlet opening and the transition surface that is not parallel to the inlet plane.Type: ApplicationFiled: August 31, 2010Publication date: March 1, 2012Inventors: Douglas Carl Hofer, Zachary William Nagel, David Graham Holmes
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Publication number: 20100329856Abstract: The present invention provides novel supersonic compressors comprising novel supersonic compressor rotors. The supersonic compressor rotors are designed to operate at very high rotational speed wherein the velocity of the gas entering the supersonic compressor rotor is greater than the local speed of sound in the gas, hence the descriptor “supersonic”. The new supersonic compressors comprise at least one supersonic compressor rotor defining an inner cylindrical cavity and an outer rotor rim and at least one radial flow channel allowing fluid communication between the inner cylindrical cavity and the outer rotor rim, said radial flow channel comprising a supersonic compression ramp. The novel supersonic compressor rotors are expected to enhance the performance of supersonic compressors comprising them, and to provide for greater design versatility in systems comprising such novel supersonic compressors.Type: ApplicationFiled: June 25, 2009Publication date: December 30, 2010Applicant: GENERAL ELECTRIC COMPANYInventors: Douglas Carl Hofer, Zachary William Nagel, David Graham Holmes
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Publication number: 20100158665Abstract: A novel supersonic compressor is provided by the present invention. In one embodiment, the novel supersonic compressor comprises a fluid inlet, a fluid outlet, and at least two counter rotary supersonic compressor rotors, said supersonic compressor rotors being configured in series such that an output from a first supersonic compressor rotor having a first direction of rotation is directed to a second supersonic compressor rotor configured to counter-rotate with respect to the first supersonic compressor rotor.Type: ApplicationFiled: December 23, 2008Publication date: June 24, 2010Applicant: General Electric CompanyInventors: Douglas Carl Hofer, Zachary William Nagel, David Graham Holmes
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Patent number: 5644918Abstract: Combustion-induced instabilities are minimized in gas turbine combustors by incorporating one or more Helmholtz resonators into the combustor. First and second plates located in the head end of the combustor casing define one cavity, and a sleeve located between the casing and the liner defines another cavity. Each of the two cavities is connected to the combustion chamber by one or more throats, thus forming Helmholtz resonators. The throats of each resonator can be tubes of different lengths and/or different cross-sectional areas to provide dynamics suppression over a broad band of frequencies. The throats can also be arranged such that each throat is associated with a different portion of its respective cavity, each cavity portion having a different volume.Type: GrantFiled: November 14, 1994Date of Patent: July 8, 1997Assignee: General Electric CompanyInventors: Anil Gulati, Anthony John Dean, David Graham Holmes, Eayre Bruce Voorhees