GUIDE VANE FOR VARIABLE TURBINE GEOMETRY

摘要

PROBLEM TO BE SOLVED: To provide an improved guide vane geometry.SOLUTION: A guide vane 10 includes four sections a1-a4, the first section a1 and the second section a2 forming a first region b1, the third section a3 and the fourth section a4 forming a third region b3. A curvature line 12 of the sections a1 and a2 of the first region b1 and a curvature line 12 of the sections a3 and a4 of the third region b3: continuously transit to each other at connection places 22 of the sections a1 and a2 and the sections a3 and a4; and curve in the same direction of upward or downward direction. The second section a2 and the third section a3: form a second region b2 of the guide vane 10; are coupled together; transit to each other in discontinuity at the connection place 22 of the two sections a2 and a3; and form a crease line 24 in a direction opposite to directions of curved extensions of the first region b1 and the third region b3.