Back to results
US 5,846,055 AGranted
Structured surfaces for turbo-machine parts
AssigneeKSB Aktiengesellschaft
InventorsSonke Brodersen, Jurgen Schill, Helmut Warth
Life of this patent
Estimating the term…
Abstract
A turbo-machine comprises a housing. The housing has internal surfaces which come into contact with fluid flowing through the turbo-machine. The surfaces have an ordered, fine, sharp-edged groove structure that is affixed to the surfaces, such that the groove structure extends predominantly in the flow direction.
Claims21
A turbo-machine comprising:
- a housing;
- an impeller disposed within said housing, one of said housing and said impeller having an internal surface which comes into contact with liquid flowing through said turbo-machine, said surface having an ordered, fine, sharp-edged groove structure being affixed to said surface, said groove structure extending predominantly in the flow direction, the groove cross-section being defined by a groove width and a groove height which are of the order of .mu.m.sup.2 ;
- wherein a dimensionless groove spacing s+ is defined such that
- s.sup.+ =(s.multidot.U.infin.)/.nu.!.multidot..sqroot.(c.sub.f /2)
- where ##EQU2##
2 more elements
A turbo-machine comprising:
- a housing;
- an impeller disposed within said housing, one of said housing and said impeller having an internal surface which comes into contact with liquid flowing through said turbo-machine, said surface having an ordered, fine, sharp-edged groove structure being affixed to said surface, said groove structure extending predominantly in the flow direction, the groove cross-section being defined by a groove width and a groove height which are of the order of .mu.m.sup.2 ;
- wherein a dimensionless groove height h+ is defined such that
- h.sup.+ =(h.multidot.U.infin.)/.nu.!.multidot..sqroot.(c.sub.f /2)
- where ##EQU5##
2 more elements
Dependencies are inferred from the claim text.