EXPERIMENTAL INVESTIGATION ON THE EFFECTS OF POSITIVE BLADE BOWING IN TURBINE STATOR CASCADES WITH LOW ASPECT RATIO

Chen Haisheng

(School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100083)

Tan Chunqing

(Institute of Engineering Thermorphysics, Chinese Academy of Sciences, Beijing 100080)

Yamamoto Atsumasa

(National Aerospace Laboratory of Japan, Tokyo 182-8522 )

Liang Xizhi

(Institute of Engineering Thermorphysics, Chinese Academy of Sciences, Beijing 100080)

Abstract: Experimental investigation on the effects of positive blade bowing on the flow fields of turbine stator cascades with a typical blade profile (HIT profile) and low aspect ratio are re-carried out. The flow fields at inlet and outlet of cascades with straight blades and +10°, +20°, +30° bowed blades are measured, and the effects of blade positive bowing on secondary flow, total pressure loss and outlet flow angle are analyzed quantitatively. The results show that, for the present blade profile, the positive blade bowing can neither decrease the secondary flow losses nor improve the distribution of exit flow angles, intensity of the secondary flow, tail vortex and corner vortex are all increased with the increasing of bowing angle while the intensity and position of passage vortex do not change obviously. The conclusion of present experiments is different from the comparative references.

Key words: Bowed blade  Turbine stator cascade  Experimental investigation  Flow field

CLC No: V231.3

Received 20040118, received in revised form 20020040425