B-12 あるスイープ圧縮機動翼に発生するハブ側失速と低減化形状(空力II,一般講演)

概要

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The stall margin of tip side forward swept blade (Swept-S_<F-F> blade) is larger compared to radially stacked blade (Radial-RD blade) in a low subsonic operation of M_<b,tip> ≈ 0.3. However fluctuating flow separation which generates high losses at mid span region are found at partial flow rate of S_<F-F> blade. This is thought to be caused by interaction between hub boundary layer fluid and hub side L.E. vortex. To stabilize mid span separation, swept blade with tip side forward sweep and hub side backward sweep (Swept-S_<F-B>) are investigated by 3-D unsteady N-S analysis at M_<b,tip> ≈ 0.72 (13000rpm). S_<F-B> blade succeeded to eliminate mid-span separation, however hub corner separation erupted causing high losses at hub. To avoid hub stall, dihedral was added toward suction side (Swept-S_<F-B+SS>) and pressure side (Swept-S_<F-B+PS>). S_<F-B+PS> blade weakened hub corner separation and increased pressure rise though it could not eliminate hub side stall completely.
公益社団法人日本ガスタービン学会の論文
2007-09-01