JP2021102967A - ターボ機械の流動制御構造及びその設計方法 - Google Patents
ターボ機械の流動制御構造及びその設計方法 Download PDFInfo
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Abstract
Description
[0001] 本出願は、2014年6月24日出願の米国仮特許出願シリアル番号62/016,431号の表題「Structures and Methods for Forcing Coupling of Flow Fields of Adjacent Bladed Elements of Turbomachines, and Turbomachines Incorporating the Same」、2014年10月28日出願の米国仮特許出願シリアル番号62/069,462号の表題「Turbomachines with Strong -Side Pinch and Curvature」、2015年1月14日出願の米国仮特許出願シリアル番号62/103,231号の表題「Enhanced Vaneless Diffuser With Impeller Cover Slots and Ribs and Methods of Enhancing Impeller and Diffuser Stage Performance」、及び2015年1月14日に出願の米国仮特許出願シリアル番号62/103,233号の表題「Turbo-PD Features and Methods of Incorporating Turbo-PD Features Into Turbomachinery」の利益を主張するものであり、各々、その内容全体を参照としてここに組み込む。
Claims (16)
- 入口、シュラウド側、及びハブ側を有する下流要素と、
ハブ及び複数のブレードを備え、入口、出口、及び回転軸を有し、前記複数のブレードは各々、先端及び後端を有して前記ハブから前記ブレードの前記シュラウド側までスパン方向に延びるインペラと、
前記複数のブレードの前記シュラウド側に対向する面を有し、前記ハブとともにインペラ通路を規定するシュラウドと、を備え、
前記インペラは、前記下流要素内に作動流体を排出するとともに、前記作動流体に流動場を生成し、前記出口における前記流動場は、前記ハブ及び前記シュラウドの一方に近接した弱化側と、前記ハブ及び前記シュラウドの他方に近接した強化側とを含み、前記流動場の絶対速度の子午面成分は、前記強化側において前記弱化側より大きくなるように設計及び構成され、
前記下流要素の前記シュラウド側及び前記ハブ側の少なくとも一方の一部に沿って流動方向に延び、前記回転軸を通って延びる子午参照面から絶対参照フレームにおいて測定された角度αで延びる接線を有する中心線を有し、前記流動場の前記弱化側に隣接して選択的に配置され、αと略同一の方向に前記流動場の前記弱化側の一部を案内するように設計及び構成される少なくとも1つの溝部を備える、
ターボ機械。 - 前記少なくとも1つの溝部は、前記インペラブレードの前記後端の上流に配置された開始位置を有する、請求項1に記載のターボ機械。
- 前記少なくとも1つの溝部の前記開始位置は、前記インペラの前記入口に実質的に配置され、
前記少なくとも1つの溝部は、2相流動に合わせて設計、構成、及び寸法決定される、請求項2に記載のターボ機械。 - 前記流動場の前記弱化側は、前記流動場内の流管の第1の部分の流動角度が前記流動場内の他の流管の流動角度から分岐する分岐領域を含み、
前記少なくとも1つの溝部の開始は、前記分岐領域に隣接して、又は前記分岐領域の上流の子午面位置に配置される、請求項1に記載のターボ機械。 - 前記少なくとも1つの溝部は、前記溝部の長さに沿って変動する深さを有し、
前記溝部は、前記後端に隣接して、又は前記後端の下流に最大深さを有する、請求項1に記載のターボ機械。 - αは、前記溝部の長さとともに変動する、請求項1に記載のターボ機械。
- 前記流動場は、1次流動部分及び2次流動部分を含み、
前記1次流動部分は、前記インペラ通路の出口部分で公称出口角度に接近する平均絶対角度αPを有し、
前記インペラ出口に隣接する前記少なくとも1つの溝部の一部の前記αは、前記公称出口角度と略同一である、請求項1に記載のターボ機械。 - 前記流動場は、1次流動部分及び2次流動部分を含み、
前記1次流動部分は、前記インペラ入口における入口角度と等しく、前記インペラ通路の出口部分における公称出口角度に接近する平均絶対角度αPを有し、
前記インペラ出口に隣接する前記少なくとも1つの溝部の一部の前記αは、前記入口角度と前記公称出口角度との間の値を有する、請求項1に記載のターボ機械。 - 前記少なくとも1つの溝部は、複数の溝部であり、
前記複数の溝部のうちの少なくとも1つは、前記下流要素の前記シュラウド側に配置され、
前記複数の溝部のうちの少なくとも1つは、前記下流要素の前記ハブ側に配置される、請求項1に記載のターボ機械。 - 前記少なくとも1つの溝部は、複数の溝部であり、
前記複数の溝部のうちの少なくとも1つは、前記下流要素の前記ハブ側に配置される、請求項1に記載のターボ機械。 - 前記後端は、前記ハブの最下流範囲の下流に配置され、
前記少なくとも1つの溝部の開始位置は、前記最下流範囲に隣接し、前記後端の上流にある、請求項10に記載のターボ機械。 - 前記ハブは、前記下流要素の前記ハブ側の一部に重なり合い、
前記ハブは、前記ハブの幅を通じて延びて前記インペラ通路と前記少なくとも1つの溝部との間に流体連通を提供する少なくとも1つのアクセス開口を含む、請求項10に記載のターボ機械。 - 前記下流要素は、ディフューザであり、
前記下流要素の前記シュラウド側及び前記ハブ側は、幅を有するディフューザ通路を規定し、
前記ディフューザは、前記流動場の前記強化側に隣接した前記シュラウド側及び前記ハブ側の一方に凸面を備えた前記ディフューザ通路幅を小さくする少なくとも1つの強化側挟持領域を備え、
前記凸面は、前記シュラウド側及び前記ハブ側の他方における通路幅減少より大きな減少を通路に与える、請求項1に記載のターボ機械。 - 入口及び出口を有するインペラ、シュラウド、ハブ、及び下流要素を有するターボ機械の流動制御構造の設計方法であって、前記ハブ及び前記シュラウドは、インペラ通路を規定し、前記方法は、
コンピュータを使用して、前記ターボ機械の数値流体モデルを展開することと、
前記数値流体モデルでインペラ通路流動場分布を計算することと、
前記流動場分布において、2次流動が集中する弱化領域を特定することと、
前記2次流動を実質的に流動方向において前記下流要素内に案内するため、前記弱化領域に隣接した前記ハブ及び前記シュラウドのうちの少なくとも一方において前記流動方向に延びる少なくとも1つの溝部を設計することと、
を備える、方法。 - 前記特定することは、前記流動分布の第1の部分の流動角度が前記流動場の第2の部分の流動角度から分岐する分岐領域を前記流動分布内に特定することをさらに含み、
前記設計することは、前記分岐領域に隣接して、又は前記分岐領域の上流に前記少なくとも1つの溝部の開始位置を配置することを含む、請求項14に記載の方法。 - 前記特定することは、前記インペラ出口において1次流動成分の角度を特定することをさらに含み、
前記設計することは、前記1次流動角度に基づき、前記少なくとも1つの溝部の角度を選択することを含む、請求項14に記載の方法。
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US20150369073A1 (en) | 2015-12-24 |
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US9845810B2 (en) | 2017-12-19 |
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