JP2015098839A5 - - Google Patents

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JP2015098839A5
JP2015098839A5 JP2013239575A JP2013239575A JP2015098839A5 JP 2015098839 A5 JP2015098839 A5 JP 2015098839A5 JP 2013239575 A JP2013239575 A JP 2013239575A JP 2013239575 A JP2013239575 A JP 2013239575A JP 2015098839 A5 JP2015098839 A5 JP 2015098839A5
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cooled
vortex generator
angle
flow
fin
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JP2015098839A (ja
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Priority to US14/547,730 priority patent/US10006368B2/en
Priority to EP14193780.5A priority patent/EP2876258B1/en
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本実施形態の大きな特徴として、後縁流路には、腹側被冷却面６ｂから背側被冷却面６ａに渡された渦発生体フィン１０（構造部材）が複数設けられている。冷却空気は、矢印９に示したように後縁流路を流通して渦発生体フィン１０を冷却し、矢印２７に示したように最後縁部から放出される。渦発生体フィン１０は、後縁流路内の冷却空気の流通方向（本例ではコード方向、すなわち図２中の左から右向き）に直交する向き（本例ではスパン方向、すなわちタービン径方向）に並べられている。そして、このスパン方向に並んだ渦発生体フィン１０の列がコード方向に複数列設置され、なおかつコード方向に隣接する列同士の渦発生体フィン１０がスパン方向に半ピッチずれた状態で配列されており、全体として渦発生体フィン１０は周方向から見て千鳥状に配列されている（図２及び図４参照）。
まず、三角錐台状の渦発生体フィン１０が被冷却面６ａ，６ｂと接する面１４，１５を底面とする。これら底面１４，１５は、面積が異なるものの相似形であって、概略二等辺三角形に形成されている。上底面１４の頂角（両斜辺２３の挟角）に対向する（底角に挟まれた）辺を底辺１３とする。下底面１５の頂角（両斜辺２４の挟角）に対向する（底角に挟まれた）辺を底辺１７とする。底面１４，１５の頂角は冷却空気の流れ方向の上流側を向いている。また、渦発生体フィン１０の三角錐台形状に基づいて仮想される三角錐形状の頂点１６（言い換えれば、渦発生体フィン１０の底面１５から離間した仮想の頂点）は、底面１５の重心よりも冷却媒体の流れ方向の上流側に偏った位置に存在する。本実施形態では、底面１４，１５の頂角に接する両側面３２がほぼ台形状に形成され、側面３２の４つの角のうち、底面１４，１５の頂角に接する角がほぼ直角になっている。また、両側面３２の間の面は、上底面１４の底辺１３から冷却空気の流れ方向に向かうにつれて下底面１５の底辺１７に向かって直線的に下る傾斜面３３となっている。この傾斜面３３は、概略等脚台形に形成されている。傾斜面３３の法線３４（上述の図３参照）は、２つの被冷却面６ａ，６ｂのうちの一方（本実施形態では、熱負荷の高いほうの背側被冷却面６ａ）に向けられている。冷却空気の流れ方向における傾斜面３３と底面１５がなす角を迎え角θとする。この抑え角θは、３０°以上６０°以下に設定されている。
まず、被冷却面の熱伝達率の向上には、冷却空気の流れに被冷却面に対して垂直な速度成分を与えて熱の輸送を活発にすることが有利である。渦発生体フィン１０は、傾斜面３３に沿って被冷却面６ａに向かう上向きの速度成分を持つ上昇流２１を作り出す。この上昇流２１の発生により、後縁流路の中央部付近にある低温の流体が被冷却面６ａ近傍に移動し、被冷却面６ａの冷却性能が向上する。さらに、渦発生体フィン１０は二次流れ２２を発生させ、被冷却面６ａ近傍の温度境界層を破壊するため、被冷却面６ａでの熱の輸送がさらに活発化するように作用するので、被冷却面６ａの広範囲に渡って冷却性能の向上が期待できる。
１ ガスタービン翼
６ａ 背側被冷却面
６ｂ 腹側被冷却面
１０ 渦発生体フィン
１４ 底面
１５ 底面
３３ 傾斜面
３４ 法線
JP2013239575A 2013-11-20 2013-11-20 ガスタービン翼 Active JP6245740B2 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2013239575A JP6245740B2 (ja) 2013-11-20 2013-11-20 ガスタービン翼
US14/547,730 US10006368B2 (en) 2013-11-20 2014-11-19 Gas turbine blade
EP14193780.5A EP2876258B1 (en) 2013-11-20 2014-11-19 Gas turbine blade

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Application Number Priority Date Filing Date Title
JP2013239575A JP6245740B2 (ja) 2013-11-20 2013-11-20 ガスタービン翼

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JP2015098839A JP2015098839A (ja) 2015-05-28
JP2015098839A5 true JP2015098839A5 (ja) 2016-12-08
JP6245740B2 JP6245740B2 (ja) 2017-12-13

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US (1) US10006368B2 (ja)
EP (1) EP2876258B1 (ja)
JP (1) JP6245740B2 (ja)

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