Fluid reaction surfaces (i.e. – impellers) – With heating – cooling or thermal insulation means – Changing state mass within or fluid flow through working...
Reexamination Certificate
2001-01-24
2002-08-13
Look, Edward K. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
With heating, cooling or thermal insulation means
Changing state mass within or fluid flow through working...
C416S19300A, C416S248000
Reexamination Certificate
active
06431833
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to the cooling of turbine buckets and, specifically, to the cooling of the platform region of the bucket, at the base of the airfoil.
BRIEF SUMMARY OF THE INVENTION
Stage one and stage two buckets in gas turbines experience high temperatures and stress, creating low cycle fatigue life concerns, particularly at the leading edge fillet where the airfoil joins the platform at the forward portion of the pressure side of the airfoil.
In aircraft engines, the bucket platforms are cooled by air entering the cavity below the platform, but this arrangement is not completely satisfactory, particularly in connection with the leading edge fillet.
This invention provides a unique solution to the above problem by directing cooling air through a tube, the forward end of which is located closely adjacent the underside of the platform, below the forward portion of the pressure side of the airfoil, so as to effectively impingement cool the platform in the localized region below the leading edge fillet.
In addition, film cooling holes are formed in the platform itself so that air introduced into the cavity by the impingement cooling tube can escape the cavity and flow along the upper surface of the platform along the contour of the pressure side of the airfoil, in a direction toward the trailing edge of the airfoil.
In its broader aspects, the invention relates to a turbine bucket having an airfoil portion and a root portion, with a substantially planar platform at an interface between the airfoil portion and root portion, a platform cooling arrangement comprising at least one bore in the root portion and at least one impingement cooling tube seated in the bore, the tube extending beyond the bore with an outlet in close proximity to a targeted area on an underside of the platform.
In another aspect, the invention relates to a method of cooling a leading edge fillet region of a turbine bucket having an airfoil portion and a root portion, the airfoil portion joined to a platform extending over the root portion, comprising: a) providing a through bore in a leading side of a cover plate in the root portion, the bore communicating with a recess in the root portion underlying the airfoil portion; b) inserting a tube in the bore, with a tip of the tube extending beyond the bore and in close proximity to a targeted area on an underside of the platform; c) supplying cooling air to the recess via the tube such that the targeted area is impingement cooled by the cooling air passing through the tube.
REFERENCES:
patent: 3804551 (1974-04-01), Moore
patent: 3936227 (1976-02-01), Wojcik
patent: 3967353 (1976-07-01), Pagnotta et al.
patent: 4012167 (1977-03-01), Noble
patent: 4017213 (1977-04-01), Przirembel
patent: 4244676 (1981-01-01), Grondahl et al.
patent: 4350473 (1982-09-01), Dakin
patent: 4531889 (1985-07-01), Grondahl
patent: 5639216 (1997-06-01), McLaurin et al.
patent: 5738489 (1998-04-01), Lee
patent: 5800124 (1998-09-01), Zelesky
patent: 6065931 (2000-05-01), Suenaga et al.
patent: 6158962 (2000-12-01), Lee et al.
patent: 6176678 (2001-01-01), Brainch et al.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 1, ““F” Technololgy—the First Half-Million Operating Hours”, H.E. Miller, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 2, “GE Heavy-Duty Gas Turbine Performance Characteristics”, F. J. Brooks, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 3, “9EC 50Hz 170-MW Class Gas Turbine”, A. S. Arrao, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 4, “MWS6001FA—An Advanced-Technology 70-MW Class 50/60 Hz Gas Turbine”, Ramachandran et al., Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 5, “Turbomachinery Technology Advances at Nuovo Pignone”, Benvenuti et al., Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 6, “GE Aeroderivative Gas Turbines—Design and Operating Features”, M. W. Horner, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 7, “Advance Gas Turbine Materials and Coatings”, P. W. Schilke, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 8, “Dry Low NOxCombustion Systems for GE Heavy-Duty Turbines”, L. B. Davis, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 9, “GE Gas Turbine Combustion Flexibility”, M. A. Davi, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 10, “Gas Fuel Clean-Up System Design Considerations for GE Heavy-Duty Gas Turbines”, C. Wilkes, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 11, “Integrated Control Systems for Advanced Combined Cycles”, Chu et al., Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 12, “Power Systems for the 21st Century “H” Gas Turbine Combined Cycles”, Paul et al., Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 13, “Clean Coal and Heavy Oil Technologies for Gas Turbines”, D. M. Todd, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 14, “Gas Turbine Conversions, Modifications and Uprates Technology”, Stuck et al., Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 15, “Performance and Reliability Improvements for Heavy-Duty Gas Turbines, ”J. R. Johnston, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 16, “Gas Turbine Repair Technology”, Crimi et al, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 17, “Heavy Duty Turbine Operating & Maintenance Considerations”, R. F. Hoeft, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 18, “Gas Turbine Performance Monitoring and Testing”, Schmitt et al., Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 19, “Monitoring Service Delivery System and Diagnostics”, Madej et al., Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 20, “Steam Turbines for Large Power Applications”, Reinker et al., Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 21, “Steam Turbines for Ultrasupercritical Power Plants”, Retzlaff et al., Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 22, “Steam Turbine Sustained Efficiency”, P. Schofield, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 23, “Recent Advances in Steam Turbines for Industrial and Cogeneration Applications”, Leger et al., Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 24, “Mechanical Drive Steam Turbines”, D. R. Leger, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 25, “Steam Turbines for STAG ™ Combined-Cycle Power Systems”, M. Boss, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 26, “Cogeneration Application Considerations”, Fisk et al., Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 27, “Performance and Economic Considerations of Repowering Steam Power Plants,” Stoll et al., Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 28, “High-Power-Density™ Steam Turbine Design Evolution”, J. H. Moore, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 29, “Advances in Steam Path Technologies”, Cofer, IV, et al., Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 30, “Upgradable Opportunitues for Steam Turbines”, D. R. Dreier, Jr., Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 31, “Uprate Options for Industrial Turbines”, R. C. Beck, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 32, “Thermal Performance Evaluation and Assesment of Steam Turbine Units”, P. Albert, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 33, “Advances in Welding Repair Technology” J. F. Nolan, Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 34, “Operation and Maintenance Strategies to Enhance Plant Profitability”, MacGillivary et al., Aug. 1996.
“39thGE Turbine State-of-the-Art Technology Seminar”, Tab 35, “Generator Insitu Inspections”, D. Stanton.
“39thGE Turbine State-of-the-Art
General Electric Company
Look Edward K.
Nguyen Ninh
LandOfFree
Gas turbine bucket with impingement cooled platform does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gas turbine bucket with impingement cooled platform, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas turbine bucket with impingement cooled platform will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2911122