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公开(公告)号：US5906474A
公开(公告)日：1999-05-25
申请号：US32515
申请日：1998-02-27
CPC分类号： F01D9/02 , F01D5/141 , F01D5/145 , F05D2230/12 , F05D2250/16 , Y02T50/673 , Y10S415/914
摘要： The invention relates to the design of a fixed-blade assembly in an axial flow steam turbine and is based on the recognition that the design of the interfacing region (fillets) between the radial ends of the blades and the end-blocks to which they are attached or of which they form a part has a significant effect on stage efficiency. The invention recognizes an optimum fillet radius in the range 0.15-0.3 of the throat dimension between the trailing edge of one blade and the suction surface of an adjacent blade, and more particularly 0.20-0.50. The fillet configuration is advantageously applied to a turbine having blades which are of constant cross-section, are curved in the radial (height) direction and are convex from root to tip on its pressure face, the result being a considerable gain in stage efficiency.
摘要翻译： 本发明涉及轴流式蒸汽涡轮机中的固定刀片组件的设计，并且基于这样的认识：叶片的径向端部与它们的端部块之间的接合区域（圆角）的设计 附着或形成一部分对舞台效率有显着影响。 本发明认识到在一个叶片的后缘和相邻叶片的吸力表面之间的喉部尺寸的0.15-0.3的范围内的最佳圆角半径，更特别地为0.20-0.50。 圆角构造有利地应用于具有恒定横截面的叶片的涡轮机，其在径向（高度）方向上弯曲并且在其压力面上从根部到尖端凸起，结果是阶段效率的显着增益。
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公开(公告)号：US5779443A
公开(公告)日：1998-07-14
申请号：US918709
申请日：1997-08-22
CPC分类号： F01D9/02 , F01D5/141 , F01D5/145 , F05D2230/12 , F05D2250/16 , Y02T50/673 , Y10S415/914
摘要： The invention relates to the design of (particularly) a fixed blade in an axial flow steam turbine. A conventional blade is of prismatic form with an aerofoil cross-section and extends radially between annular end blocks. The inventive blade is curved in the radial (height) direction, being convex from root to tip on its pressure face. The setting angle relative to the corresponding prismatic blade is therefore fine at the root and tip and coarse at the blade mid-height. The throat opening is thus reduced at root and tip and increased at mid-height so displacing some mass flow away from both lossy end wall regions. A considerable gain in the stage efficiency results. A further improvement results from providing an optimum corner fillet between the blades and end walls at the root and tip.
摘要翻译： 本发明涉及（特别地）轴流式汽轮机中的固定叶片的设计。 传统的叶片是具有翼型横截面的棱柱形式并且在环形端块之间径向延伸。 本发明的刀片在径向（高度）方向上弯曲，在其压力面上从根部到尖端凸起。 因此，相对于相应的棱柱形刀片的设定角度在根部和尖端处是细小的，并且在刀片中间高度处是粗糙的。 因此，喉部开口在根部和尖端处减小，并且在中间高度处增加，从而使一些质量流从两个有损的端壁区域移开。 舞台效率有相当大的提升。 进一步的改进是通过在叶片和根部和尖端的端壁之间提供最佳的角圆角。
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