Search Patents
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Publication number: 20130263603Abstract: A method of designing a fuel nozzle of a gas turbine engine to reduce fretting thereof during use, including establishing an initial nozzle design, determining a first natural frequency of that design and a running frequency range of the gas turbine engine, and increasing a first transverse dimension of the stem member of the nozzle across a length of a portion thereof adjacent the inlet end until the first natural frequency of the nozzle is outside the running range, while a second transverse dimension of the portion remains at least substantially unchanged across the length thereof.Type: ApplicationFiled: October 10, 2012Publication date: October 10, 2013Applicant: PRATT & WHITNEY CANADA CORP.Inventor: PRATT & WHITNEY CANADA CORP.
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Publication number: 20130139513Abstract: A modular fuel nozzle tip for a gas turbine engine includes a body defining one or more fuel conveying passages extending therethrough, an annular cap having a radially inner shoulder surface interfacing with the peripheral end surface of the body to define a plurality of air channels extending through the head portion of the modular fuel nozzle tip. At least two fasteners fasten the annular cap to the body.Type: ApplicationFiled: January 30, 2013Publication date: June 6, 2013Applicant: Pratt & Whitney Canada Corp.Inventor: Pratt & Whitney Canada Corp.
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Patent number: 7712313Abstract: In the fuel nozzle, the fuel is circulated in a helical path around the interface of a stem of the fuel nozzle and a flange for increase the cooling.Type: GrantFiled: August 22, 2007Date of Patent: May 11, 2010Assignee: Pratt & Whitney Canada Corp.Inventors: Aleksandar Kojovic, Lev Alexander Prociw
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Patent number: 8959928Abstract: The positioning arrangement comprises at least one pair of complimentary rounded recesses, each recess being provided on the mating face of the corresponding component. One ball is positioned between each pair of complementary recesses.Type: GrantFiled: April 20, 2012Date of Patent: February 24, 2015Assignee: Pratt & Whitney Canada Corp.Inventors: Lev Alexander Prociw, Aleksandar Kojovic
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Patent number: 8935925Abstract: A fuel nozzle sheath has a lateral opening for admitting air about a nozzle stem. The stress distribution along the perimeter of the window is smoothed out by increasing the corner radius of the window corner presenting higher stress concentration.Type: GrantFiled: March 22, 2012Date of Patent: January 20, 2015Assignee: Pratt & Whitney Canada Corp.Inventors: Bhawan Patel, Nagaraja Rudrapatna
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Patent number: 8181465Abstract: The positioning arrangement comprises at least one pair of complimentary rounded recesses, each recess being provided on the mating face of the corresponding component. One ball is positioned between each pair of complementary recesses.Type: GrantFiled: October 31, 2008Date of Patent: May 22, 2012Assignee: Pratt & Whitney Canada Corp.Inventors: Lev Alexander Prociw, Alexsandar Kojovic
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Patent number: 7559202Abstract: An assembly that includes two components joined by a pre-compressed braze where the compression in the braze is progressively relieved upon relative thermal expansion of the two components. Also disclosed is a process for producing a pre-compressed braze.Type: GrantFiled: November 15, 2005Date of Patent: July 14, 2009Assignee: Pratt & Whitney Canada Corp.Inventors: Lev Alexander Prociw, Harris Shafique, Dany Clarence Gaudet
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Patent number: 7926280Abstract: A floating collar assembly is provided comprising a substantially flat floating collar trapped between a heat shield and a dome panel of the combustor. Axial engagement between the floating collar and the fuel nozzle is maintained via a nozzle cap mounted over the fuel nozzle tip.Type: GrantFiled: May 16, 2007Date of Patent: April 19, 2011Assignee: Pratt & Whitney Canada Corp.Inventors: Oleg Morenko, Kenneth Parkman, Stephen Phillips
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Patent number: 7937926Abstract: A fuel conveying member for an engine, the fuel conveying member having heating means integrated therein to permit pyrolysis of carbonaceous deposits.Type: GrantFiled: September 12, 2008Date of Patent: May 10, 2011Assignee: Pratt & Whitney Canada Corp.Inventors: Lev Alexander Prociw, Harris Shafique, Jason Fish, Bhawan B. Patel
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Patent number: 7117678Abstract: A gas turbine fuel nozzle head includes an outlet passage having a curved annular transitional surface extending smoothly to a substantially radial and annular surface relative to a central axis of the fuel nozzle head, for providing a low cost and compact structure with improved cold start and altitude re-light capabilities.Type: GrantFiled: April 2, 2004Date of Patent: October 10, 2006Assignee: Pratt & Whitney Canada Corp.Inventors: Parthasarathy Sampath, Qing-Ping Zheng
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Patent number: 7497012Abstract: A method and a pre-shaped workpiece for making at least a portion of a gas turbine fuel nozzle are disclosed having opposed gripping tabs which can be secured to machine tool holders during manufacturing by a machine tool.Type: GrantFiled: December 21, 2004Date of Patent: March 3, 2009Assignee: Pratt & Whitney Canada Corp.Inventors: Lev Alexander Prociw, Harris Shafique, Lafleche Gagnon
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Patent number: 8904800Abstract: A combustor dome heat shield and a louver are separately metal injection molded and then fused together to form a one-piece combustor heat shield.Type: GrantFiled: October 10, 2012Date of Patent: December 9, 2014Assignee: Pratt & Whitney Canada Corp.Inventors: Bhawan B. Patel, Lorin Markarian, Melissa Despres
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Patent number: 7617683Abstract: A fuel supply assembly for a gas turbine engine including a manifold portion with a transfer conduit, a fuel nozzle with an entry conduit and disconnectable means for retaining the transfer and entry conduits in mating engagement with one another.Type: GrantFiled: December 15, 2005Date of Patent: November 17, 2009Assignee: Pratt & Whitney Canada Corp.Inventors: Lev Alexander Prociw, Alekaandar Kojovic
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Patent number: 7559201Abstract: A fuel manifold of gas turbine engines comprises a tube for fluid communication with a fuel source and for connection with at least one fuel nozzle tip to thereby define a fuel conveying passage. A redundant seal is provided around the tube and covers substantially an entire length thereof to reduce a risk of fuel leakage of the fuel conveying passage.Type: GrantFiled: September 8, 2005Date of Patent: July 14, 2009Assignee: Pratt & Whitney Canada Corp.Inventors: Lev Alexander Prociw, Harris Shafique
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Patent number: 8555649Abstract: A fuel nozzle air swirler assembly has a slotted cap to provide stress-relief. The stress-relief slits in the cap have an axial and a tangential component to impart a swirl to the air leaking therethrough in the same direction as that of the air exiting the swirler body.Type: GrantFiled: September 2, 2009Date of Patent: October 15, 2013Assignee: Pratt & Whitney Canada Corp.Inventors: Bhawan B. Patel, Oleg Morenko, Nagaraja Rudrapatna
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Patent number: 7415828Abstract: A gas turbine fuel nozzle comprises a body and a sheath adapted to surround the body. A snap-on device is provided for releasably retaining the sheath on the body. The snap-on device is displaceable between a first position for allowing the sheath to be fitted over the body and a second position for retaining the sheath in place about the body.Type: GrantFiled: May 29, 2003Date of Patent: August 26, 2008Assignee: Pratt & Whitney Canada Corp.Inventor: Isabelle Brown
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Patent number: 6871488Abstract: A gas fuel nozzle for mounting in a combustor wall of a gas turbine engine, with an at least partially radially-directed array of gas fuel outlets extending beyond an air flow head having an array of compressed air jet apertures around the gas fuel outlets. The air flow head also has a deflector for creating an axial flow of air for deflecting in an axial direction the radially-injected gas fuel.Type: GrantFiled: December 17, 2002Date of Patent: March 29, 2005Assignee: Pratt & Whitney Canada Corp.Inventors: Saeid Oskooei, Kian McCaldon
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Patent number: 10816207Abstract: A fuel nozzle for a gas turbine engine includes a stem having a monolithic stem body extending longitudinally between a first end and a second end. The monolithic stem body has a radially outer surface and at least one helical fuel passage extending through the monolithic stem body and disposed inwardly from the radial outer surface. The at least one helical fuel passage extends helically through the monolithic stem body about a passage axis extending between the first and second ends.Type: GrantFiled: February 14, 2018Date of Patent: October 27, 2020Assignee: PRATT & WHITNEY CANADA CORP.Inventor: Michael A. Fryer
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Patent number: 6823677Abstract: Thermal stress relief in a nozzle head of a gas turbine fuel nozzle is provided by forming a slit through each selected air passages of the nozzle head. The strategic location of stress-relief slits contributes to extend the fatigue life of the nozzle with minimal cost and impact on the nozzle aerodynamics.Type: GrantFiled: September 3, 2002Date of Patent: November 30, 2004Assignee: Pratt & Whitney Canada Corp.Inventors: Lev Alexander Prociw, Harris Shafique, Victor Gandza
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Patent number: 11713723Abstract: Systems and methods for operating an engine are described herein. The engine is operated at low power by supplying fuel to a combustor through a first set of fuel nozzles of at least one first manifold and without supplying fuel to the combustor through a second set of fuel nozzles of at least one second manifold. An amount of fuel to at least in part fill the at least one second manifold to impede fuel coking of the second set of fuel nozzles is determined. The amount of fuel is periodically supplied to the at least one second manifold.Type: GrantFiled: May 29, 2019Date of Patent: August 1, 2023Assignee: PRATT & WHITNEY CANADA CORP.Inventors: James Jarvo, Patrick Manoukian, Philippe Beauchesne-Martel