Variable camber tandem blade bow for turbomachines
First Claim
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1. A bidirectional thrust or flow device, comprising:
- a casing;
support means disposed within said casing;
a first plurality of uncambered blades defining a first blade row;
first pivotal attaching means cooperating with each of said first plurality of uncambered blades for pivotally attaching said first plurality of uncambered blades to said support means;
at least a second plurality of uncambered blades defining at least a second blade row;
pivotal attaching means cooperating with each of said at least a second plurality of uncambered blades for pivotally attaching said at least said second plurality of uncambered blades to said support means and wherein said pivotal attaching means are tangentially offset from said first pivotal attaching means so that said first blade row is offset from said at least said second blade row; and
means cooperating with said first pivotal attaching means and said pivotal attaching means for pivoting said first plurality of uncambered blades and said at least said second plurality of uncambered blades respectively, said first plurality of uncambered blades pivotable over a first pitch angle range from a maximum (positive) pitch angle through a minimum (negative) pitch angle and said at least said second plurality of uncambered blades pivotable over a second pitch angle range from a maximum (positive) pitch angle through a minimum (negative) pitch angle, and whereinsaid maximum (positive) pitch angle and said minimum (negative) pitch angle of said first pitch angle range do not equal said maximum (positive) pitch angle and said minimum (negative) pitch angle of said second pitch angle range, and whereinany non-zero intermediate pitch angle setting of said first pitch angle range does not equal any intermediate pitch angle setting of said said second pitch angle range, and whereina first predetermined pitch angle setting in said first pitch angle range and a second predetermined pitch angle setting in said second pitch angle range causes each of said first plurality of uncambered blades to be aligned with a respective blade of said at least said second plurality of blades to define an energization slot therebetween, and whereinsaid each of said first plurality of uncambered blades aligned with said respective blade of said at least said second plurality of blades in combination form a cambered blade configuration, wherebya total flow turning angle of said bidirectional thrust or flow device is equal to an incidence angle of a working fluid and an absolute magnitude of a difference between said first and predetermined pitch angle setting and said second predetermined pitch angle setting.
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Abstract
Multiple flat-plate blade rows of pitch adjustable blades are offset mounted in a manner such that when flat-plate blades in adjacent rows are aligned at a specific pitch setting, respective flat-plate blades of the adjacent rows nearly mate. The offset between the flat-plate blade rows functions to produce unequal pitch angle settings of the blades of adjacent rows which, in turn, function to produce the result that the respective flat-plate blades which nearly mate, in combination, produce a blade configuration which has an effective camber.
30 Citations
12 Claims
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1. A bidirectional thrust or flow device, comprising:
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a casing; support means disposed within said casing; a first plurality of uncambered blades defining a first blade row; first pivotal attaching means cooperating with each of said first plurality of uncambered blades for pivotally attaching said first plurality of uncambered blades to said support means; at least a second plurality of uncambered blades defining at least a second blade row; pivotal attaching means cooperating with each of said at least a second plurality of uncambered blades for pivotally attaching said at least said second plurality of uncambered blades to said support means and wherein said pivotal attaching means are tangentially offset from said first pivotal attaching means so that said first blade row is offset from said at least said second blade row; and means cooperating with said first pivotal attaching means and said pivotal attaching means for pivoting said first plurality of uncambered blades and said at least said second plurality of uncambered blades respectively, said first plurality of uncambered blades pivotable over a first pitch angle range from a maximum (positive) pitch angle through a minimum (negative) pitch angle and said at least said second plurality of uncambered blades pivotable over a second pitch angle range from a maximum (positive) pitch angle through a minimum (negative) pitch angle, and wherein said maximum (positive) pitch angle and said minimum (negative) pitch angle of said first pitch angle range do not equal said maximum (positive) pitch angle and said minimum (negative) pitch angle of said second pitch angle range, and wherein any non-zero intermediate pitch angle setting of said first pitch angle range does not equal any intermediate pitch angle setting of said said second pitch angle range, and wherein a first predetermined pitch angle setting in said first pitch angle range and a second predetermined pitch angle setting in said second pitch angle range causes each of said first plurality of uncambered blades to be aligned with a respective blade of said at least said second plurality of blades to define an energization slot therebetween, and wherein said each of said first plurality of uncambered blades aligned with said respective blade of said at least said second plurality of blades in combination form a cambered blade configuration, whereby a total flow turning angle of said bidirectional thrust or flow device is equal to an incidence angle of a working fluid and an absolute magnitude of a difference between said first and predetermined pitch angle setting and said second predetermined pitch angle setting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification
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Current AssigneeJohn G. Stricker
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Original AssigneeJohn G. Stricker
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InventorsStricker, John G.
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Primary Examiner(s)Powell, Jr., Everette A.
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Application NumberUS06/683,448Time in Patent Office566 DaysField of Search416/200 R-200A, 416/231 B, 416/DIG. 5, 416/127, 416/130, 416/223 A, 415/130, 415/129, 415/149 AUS Class Current415/130CPC Class CodesF01D 5/146 of blades with tandem confi...F04D 29/36 adjustable flexible blades ...Y02T 50/60 Efficient propulsion techno...Y10S 415/915 Pump or portion thereof by ...Y10S 416/05 Variable camber or chord le...
