Numerical investigation of the non-axisymmetric end wall application to the white cascade

A profiling method, in terms of the trigonometric function and considering about the different axial location of the non- Axisymmetric end wall warping, is developed firstly. The axial and the circumferential location of the end wall warping are de- fined by the cosine function and the sine function respectively. To investigate the effects of the non-axisymmetric end wall on the flow property and the steam condensation, the profiling method is applied to the aft-loaded White cascade with the re- vised nucleation model of the two-phase wet steam flow. The results show that it has very little influence on the performance while the non-axisymmetric end wall warping is closing to the leading edge. If the non-axisymmetric end wall warping locates nearby the trailing edge, the aerodynamic loss increases signifi- cantly with a sharp flow separation on the corner of the suction side. While the crest is in the middle of the axial chord, the aero- dynamic loss nearby the end wall decreases about 2.0%, imply- ing a well improvement in the aerodynamic performance. Be- sides, the steam condensation nearby the end wall is restrained significantly while the non-axisymmetric end wall warping is in the middle axial chord or closing the trailing edge. The proper designed non-axisymmetric end wall, which is able to increase the pressure of the zone with the wet steam nu- cleation, is beneficial to improve the aerodynamic performance and control the steam condensation in the passage of the low pressure steam turbine.