EXPERIMENTAL INVESTIGATION ON THE EFFECTS OF POSITIVE BOWED BLADES ON THE FLOW FIELDS

 IN TURBINE STATOR CASCADE

Tan Chunqing  Chen Haisheng  Kang Shun  Jiang Hongde  Cai Ruixian  Liang Xizhi

(Institute of Engineering Thermophysics, Chinese Academic Sciences)

Abstract: Experimental investigations on the flow fields of a typical blade profile cascades are carried out with different bowed angles. The exit flow fields of straight cascade and the positive bowed cascade with bowed angles +10°,+20°and +30°are investigated. The results show that for the present blade profile, with increasing of the bowed angle , the passage vortex is always near the endwall and the intensity does not change obviously, however intensity of the exit wake vortex increases and extends to the midspan of cascade obviously, the total energy losses at the endwall does not change obviously, however the total energy losses at the midspan increase sharply, so the total energy losses of the whole cascade increase by the increasing of the bowed angle and the energy losses of straight blade cascade is minimal.

Key words: Positive bowed blade  Turbine stator cascade  Flow field
CLC No: V231.3
中国博士后科学基金、国家攀登B计划第48项、中科院院长青年创新基金、中科院百人计划及国家杰出青年基金资助项目. Received 20001102, received in revised form 20010120