Free Publication

Suppression of Secondary Flows in a Turbine Nozzle with Controlled Stacking Shape and Exit Circulation by 3D Inverse Design Method

Written by H. Watanabe and H. Harada from Aerodynamic Machinery Div. at Ebara Research Co., Ltd. Japan.

What's inside?

For the axial turbine stage, the design of circulation rV0 distribution between the nozzle and blade has an important effect on the stage performance, because it determines the work distribution in the blade, the stage reaction and the twisting shape of the blade.

This paper describes the new method of full 3D design for axial turbine nozzles and blades by applying the 3D inverse design method in which the blade geometry can be determined by specified distributions of circulation and blade blade thickness.


Ebara paper_Turbine

3D stages designed using the inverse design method achieved an efficiency gain of 2.0% to 2.5% over conventional stages. Such gain was confirmed in tests conducted at a single-stage air turbine test facility.

In this publication, you will:

  1. Discover a new methodology for the design of HP/IP turbine nozzles and blades using the 3D inverse method;
  2. Learn how the secondary flows in the nozzle have been effectively suppressed through the rV0 distribution in the nozzle and through the stacking conditions;
  3. Understand the advantage of using a 3D inverse design method in this project.