Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Radial flow devices
Reexamination Certificate
2011-08-16
2011-08-16
Kershteyn, Igor (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Radial flow devices
C416S22300B, C416S238000, C416S243000
Reexamination Certificate
active
07997872
ABSTRACT:
The suction surface blade angle of a transonic fan blade, subject in use to a shock wave, progressively reduces along part of the suction surface, beginning at a position upstream of the shock wave position. The increased area variation at the location of the shock results in the shock position becoming less sensitive to small geometric imperfections. The reduced shock sensitivity reduces the variation in aerodynamic load and hence reduces the untwist variation with respect to small geometric imperfections. This has the effect of stabilising the untwist deflections of the fan.
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Kershteyn Igor
Oliff & Berridg,e PLC
Rolls-Royce plc
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