BLADE NIB NODE AND SHELVES FOR ULTRASONIC FLOW Russian patent published in 2017 - IPC F01D5/14 

FIELD: machine engineering.

SUBSTANCE: blade nib node and the shelf includes a feather and a shelf on whose surface a pen is mounted, the shelf surface having a recess between the leading edge and the trailing edge of the blade feather. The deepest segment of the depression is located in the half, upstream, blade of the scapula. The skeleton curve is a curve that is a variation of the skeletal angle of the blade feather in a secant plane parallel to the shelf surface, depending on the position along the wheel axis. The linearized skeletal curve is a linearized representation of the skeleton angle as a function of the position along the wheel axis and represents a straight line connecting points characterising the skeleton angle at 10 and at 90% of the axial dimension of the blade from the leading edge, in the immediate vicinity of the shelf the skeleton curve has an elevated region lying above the linearized skeletal curve. A plane in which the displacement between the skeleton curve and the linearized skeleton curve is maximum is located in the axial direction between a position of 0.5×N and 1.5×N, where N is the percentage representing the position of the plane of the deepest segment relative to the axial dimension of the blade of the blade from its leading edge. Other inventions of the group refer to a blade comprising the aforementioned assembly, a working wheel provided with the above-mentioned assembly or blade, and a gas turbine engine with such an impeller.

EFFECT: increase of aerodynamic efficiency of impeller of gas turbine engine.

10 cl, 6 dwg