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首页> 外文会议>NDT 2010 conference >Phased array ultrasonic inspection of low pressure steam turbine rotors - Curved Axial Entry Fir tree roots
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Phased array ultrasonic inspection of low pressure steam turbine rotors - Curved Axial Entry Fir tree roots

机译：低压蒸汽轮机转子的相控阵超声检查-弯曲的轴向进入杉树根

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摘要

The last stage blades of low pressure steam turbine rotors are among the most highlyrnstressed components in modern power generating plants. The ongoing drive forrnincreased efficiency has seen the proliferation in the number of designs incorporatingrnlarger last stage blades with curved axial entry fir tree roots (CAEFTR); the curvature ofrnthe root attachment allows more flexibility in the aerodynamic design of the aerofoilrnwith improved inter-blade spacing.rnThe tendency of CAEFTRs to suffer failure induced by stress corrosion cracking,rnhigh-cycle fatigue cracking, or low-cycle high strain fatigue, is well documented, andrncan be shown to be most likely to occur in the first two serrations of the blade root.rnFinite element analysis and actual failures confirm the regions under highest risk andrnhave driven developments in ultrasonic phased array techniques to achieve detection ofrndefects in these regions whilst in-situ; in turn avoiding the huge costs associated inrndecommissioning and dismantling rotors to perform alternative NDE surfacerninspections. Due to the complexity of the root geometry there are many difficulties inrnapplying ultrasonic techniques due to limited scanning surfaces, inter-blade spacing, andrndisorientation of the active ultrasound trajectory and the region under test.rnIn this presentation the author will show that the application of novel phased arrayrntechniques and unique inspection design has led to increased sensitivity to smallerrndefects and comprehensive coverage of CAEFTR rotor designs in-situ. It will also bernshown how the application of these techniques has negated the need to upgrade bothrnequipment and resources to the use of 2d arrays, thereby reducing inspection costsrnsignificantly whilst achieving higher repeatability and sensitivity. Novel inspectionrndesign has led to the ability to reduce the number of scans required, enabled single scanrnencoded data recording over the whole blade root, increased sensitivity, improvedrndetectability, and increased coverage, whilst reducing inspection costs and time.
机译：低压蒸汽涡轮机转子的末级叶片是现代发电厂中应力最大的组件之一。持续不断的提高效率的驱动已经看到了许多设计的增加，这些设计包括了更大的带有弯曲的轴向进入杉树根（CAEFTR）的末级叶片。根部附件的曲率可为翼型的空气动力学设计提供更大的灵活性，并改善叶片间距。rnCAEFTR受应力腐蚀裂纹，高周疲劳裂纹或低周高应变疲劳引起的失效趋势很好。有限元分析和实际故障确认了处于最高风险的区域，并且推动了超声相控阵技术的发展，以实现在这些区域中检测到这些区域中的缺陷，这是有记载的，并且可能被证明最可能发生在叶片根部的前两个锯齿中。现场从而避免了因进行替代性的NDE表面检查而进行的停用和拆除转子所带来的巨额成本。由于根部几何形状的复杂性，由于有限的扫描表面，刀片间的间距以及活动超声轨迹和被测区域的方向不正确，应用超声技术存在许多困难。在本演讲中，作者将展示新型的应用。相控阵技术和独特的检查设计提高了对较小缺陷的敏感性，并全面覆盖了CAEFTR转子设计的原位。还将显示这些技术的应用如何消除了将设备和资源升级为使用2d阵列的需求，从而显着降低了检查成本，同时实现了更高的可重复性和灵敏度。新颖的检查设计能够减少所需的扫描次数，在整个刀片根上实现单次扫描编码的数据记录，提高灵敏度，提高可检测性，并增加覆盖范围，同时减少检查成本和时间。

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  • 来源
    《NDT 2010 conference》|2010年|p.1-12|共12页
  • 会议地点 Cardiff(GB);Cardiff(GB)
  • 作者

    Chris Charlesworth;

  • 作者单位

    RWE Power International Electron, Windmill Hill Business Park Whitehill Way, Swindon Wiltshire, SN5 6PB United Kingdom, Tel: +44 (0)1793 892900 Fax: +44 (0)1793 892421 chris.charlesworth@rwenpower.com;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 组织检查法、非破坏性试验法;
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