| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a turbine nozzle having an inner band surface contoured in a 3D for minimizing the action of a horseshoe vortex and a passage vortex. <P>SOLUTION: This turbine nozzle includes an array of turbine vanes 28 between an inner band 30 and an outer band. Each vane 28 includes opposed pressure side and suction side extending between the opposed leading edge and trailing edge. The vanes 28 define a plurality of flow passages each of which is bounded between the inner band 30, the outer band and the adjacent first and second vanes 28. A surface of the inner band 30 in each of the passages is contoured in a non-axisymmetric shape including the peak 46 of a relatively high radial height adjacent to the pressure side of the first vane 28 adjacent to the leading edge and a trough 48 of a relatively low radial height arranged on the suction side of the second vane 28 in the rear of the leading edge. The peak 46 and the trough 48 cooperatively define an arcuate channel extending axially along the inner band 30 between the first and second vanes 28. <P>COPYRIGHT: (C)2012,JPO&INPIT |
