562015-03-24 , 法政大学大学院理工学・工学研究科
The objective of this study is to obtain the useful knowledge for the development of ultra-highly loaded turbine cascades (UHLTC) with the high aerodynamic performance. In the present study, the computations were performed for the flows in the three types of UHLTC which have the same turning angle of 160 degree but are different in the maximum blade thickness. Moreover, the effects of incidence angle on the secondary flow behavior in these UHLTC were also investigated. The computed results showed that the increase of the maximum blade thickness and the incidence angle intensified the tip leakage flow, and consequently increased the aerodynamic loss in the cascade passage. Moreover, it was also clarified that the starting point of the leakage flow discharging from the suction side of tip clearance was moved toward upstream by the decrease of maximum blade thickness and the increase of incidence angle.