紀要論文

超高負荷軸流タービン直線翼列内の前縁フィレットによる二次流れ低減に関する実験的研究 : フィレット幅の影響

EXPERIMENTAL STUDY ON REDUCTION OF SECONDARY FLOW IN ULTRA-HIGHLY LOADED AXIAL TURBINE LINEAR CASCADE BY APPLICATION OF LEADING EDGE FILLET : EFFECT OF FILLET WIDTH

jpn

24368083

https://doi.org/10.15002/00026306

法政大学大学院理工学研究科

法政大学大学院紀要. 理工学研究科編

64

1

6

2023-03-24

Version of Record

An increase of turbine blade loading by increasing the blade turning angle contributes to the downsizing and weight reduction of gas turbines, but simultaneously intensifies the secondary flows. The application of a fillet at the leading edge endwall junction (LEF) is effective for the reduction of the horseshoe vortex, which is a predominant secondary flow. Since the pressure side leg of horseshoe vortex entrains the endwall boundary layer and grows into the passage vortex, the reduction of the horseshoe vortex leads to the reduction of the passage vortex. In this study, the LEF was applied to the ultra-highly loaded axial turbine linear cascade (UHLTC) with the turning angle of 160 degrees. The effectiveness of the LEF on the UHLTC was examined focusing on the fillet width by means of the internal flow measurement, the endwall surface pressure measurement and the oil flow visualization. The experimental results showed that the application of LEF to the UHLTC suppressed the passage vortex as well as the horseshoe vortex, and consequently reduced the secondary flow losses. In addition, the increase of the fillet width enhanced the suppression effect caused by the LFE.

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