VENTURI
A venturi is disclosed, the venturi comprising a mixing cavity surrounded circumferentially by an annular venturi wall, and a swirler having a plurality of vanes arranged circumferentially around a swirler axis, wherein the swirler and the annular venturi wall have a unitary construction. In another exemplary embodiment the venturi comprises an annular venturi wall, a swirler located at an axially forward portion of the venturi, the swirler having a plurality of vanes arranged circumferentially around a swirler axis, and a heat shield located axially aft from the swirler, wherein the annular venturi wall, the swirler and the heat shield have a unitary construction.
1 . A venturi comprising:
an annular venturi wall;
a mixing cavity surrounded circumferentially by the annular wall; and
a swirler having a plurality of vanes arranged circumferentially around a swirler axis, wherein the swirler and the annular venturi wall have a unitary construction.
2 . A venturi according to claim 1 wherein the swirler is located at an axially forward end of the venturi.
3 . A venturi according to claim 1 further comprising an annular splitter located radially inward from the annular venturi wall.
4 . A venturi according to claim 3 wherein the plurality of vanes extend between the venturi wall and the annular splitter.
5 . A venturi according to claim 3 wherein the splitter comprises an annular splitter wall coaxially located around the swirler axis.
6 . A venturi according to claim 3 further comprising an annular swirled-air passage between an outer surface of the splitter and an inner surface of the venturi.
7 . A venturi according to claim 1 wherein each vane has a leading edge and a trailing edge located axially forward from the leading edge, and has an orientation that facilitates producing a swirling motion to an airflow flowing through the swirler.
8 . A venturi according to claim 1 wherein each vane has substantially the same geometry.
9 . A venturi according to claim 1 wherein at least one vane has a geometry that is different from another vane.
10 . A venturi according to claim 1 further comprising a fillet between a root portion of a vane and the splitter.
11 . A venturi according to claim 10 wherein the fillet has a contour that facilitates a smooth flow of air in the swirler.
12 . A venturi according to claim 5 wherein the splitter wall has a recess that facilitates interfacing the venturi with an adjacent component during assembly.
13 . A venturi according to claim 1 further comprising at least one groove located on the venturi wall capable of receiving a brazing material.
14 . A venturi according to claim 1 further comprising a lip located at an axially aft end of the venturi.
15 . A venturi comprising:
an annular venturi wall;
a swirler located at an axially forward portion of the venturi, the swirler having a plurality of vanes arranged circumferentially around a swirler axis; and
a heat shield located axially aft from the swirler, wherein the annular venturi wall, the swirler and the heat shield have a unitary construction.
16 . A venturi according to claim 15 wherein the heat shield is annular.
17 . A venturi according to claim 15 wherein the heat shield is located at an axially aft end of the venturi.
18 . A venturi according to claim 16 further comprising at least one slot extending between the venturi wall and the heat shield.
19 . A venturi according to claim 16 , further comprising a plurality of slots extending between the venturi wall and the heat shield, the slots being arranged circumferentially around the swirler axis.
20 . A venturi according to claim 16 , further comprising a plurality of bumps located on the heat shield and arranged circumferentially around the swirler axis.
21 . A venturi according to claim 16 , further comprising a lip located at the axially aft end of the venturi wall.