Vortex generators placed in the interblade channel of a compressor rectifier
A compressor rectifier of a turbomachine including a plurality of stationary blades extending in a circular fashion between an inner shroud and an outer shroud that are concentric and define interblade channels forming an air duct in which air to be compressed flows, the inner shroud including at least one vortex generator extending into the air duct to reduce corner vortices. The vortex generator is positioned axially in the interblade channel, between the axial position of a leading edge of the blades and those of a trailing edge thereof.
1. A device for rectifying airflow in a turbine engine, or in a compressor, the device comprising:
a plurality of fixed vanes extending in a circular fashion between an inner collar and an outer collar concentric with each other and in which an air flow to be compressed circulates;
an inter-vane channel is defined between two adjacent vanes, each vane comprising a suction face and a pressure face opposed transversally, and a leading edge and a trailing edge opposed axially; and
a vortex generator to reduce corner vortices, the vortex generator being disposed on the inner collar and extending radially in an air duct from the inner collar,
wherein the vortex generator is arranged transversally in the inter-vane channel between the two adjacent vanes and axially between the leading edge and the trailing edge of the adjacent vanes,
wherein the vortex generator is arranged in a zone situated axially downstream from a first plane passing through a center of an axial span of the adjacent vanes and transversally near the suction face of one of the adjacent vanes and a second plane passing through a center of an inter-vane distance so as to create a vortex upstream from a shedding zone forming the corner vortices and to interact immediately with the corner vortices,
wherein the vortex generator has a triangular planar shape with a first side extending along the inner collar, a second side extending radially, and a third side linked to the first and second sides, the first side having a first apex distant from the suction face by a distance equal to a height of the vortex generator +/−10%, the second side being opposed to the first apex is substantially facing the pressure face of the other of the adjacent vanes, and
wherein the height of the vortex generator being measured perpendicularly to the inner collar, is between 2% and 15% of a height of the vane.
2. A device according to claim 1 , wherein the vortex generator is in a form of a right-angled triangle, the right angle being situated on a side opposite to the suction face of the vane.
3. A device according to claim 1 , wherein a length of a curvilinear side is equal to twice, +/−10%, the height of the vortex generator, measured perpendicularly to the outer collar.
4. A turbine engine compressor comprising at least one device according to claim 1 .
5. A turbine engine comprising a compressor according to claim 4 .
6. A device according to claim 1 , wherein the triangular planar shape has a lowest vertex which is closest to the suction face of an adjacent vane.