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首页> 外文学位 >Effects of inlet guide vane flow control on forced response of a transonic fan.
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Effects of inlet guide vane flow control on forced response of a transonic fan.

机译：入口导向叶片流量控制对跨音速风扇强制响应的影响。

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摘要

The main contributor to the high-cycle fatigue of compressor blades is the response to aerodynamic forcing functions generated by an upstream row of stators or inlet guide vanes. Resonant response to engine order excitation at certain rotor speeds is especially damaging. Studies have shown that flow control by trailing edge blowing (TEB) can reduce stator wake strength and the amplitude of the downstream rotor blade vibrations generated by the unsteady stator-rotor interaction. In the present study, the effectiveness of TEB to reduce forced blade vibrations was evaluated in a modern single-stage transonic compressor rig. A row of wake generator (WG) vanes with TEB capability was installed upstream of the fan blisk, the blades of which were instrumented with strain gages. Data was collected for varied TEB conditions over a range of rotor speed which included one fundamental and multiple harmonic resonance crossings. Sensitivity of resonant response amplitude to full-span TEB flowrate, as well as optimal TEB flowrates, are documented for multiple modes. Resonant response sensitivity was generally characterized by a robust region of substantial attenuation, such that less-than-optimal TEB flowrates could prove to be an appropriate design tradeoff. The fundamental crossing amplitude of the first torsion mode was reduced by as much as 85% with full-span TEB at 1.1% of the total rig inlet flow. Similar reductions were achieved for the various harmonic crossings, including as much as 94% reduction of the second leading edge bending mode resonant response using 0.74% of the rig flow for full-span TEB. At least 32% reduction was achieved for all modal crossings over the broad flow range of 0.5 to 0.9% of the rig flow. Thus the results demonstrate the modal- and flowrate-robustness of full-span TEB for reducing forced response in a modern, closely-spaced transonic compressor. Reduced spanwise TEB coverage was generally found to provide less peak reduction. Widely varying sensitivities of the vibration modes to the spanwise TEB distribution were also noted. While the second chordwise mode experienced roughly the same maximum response reduction of 80% for all of the spanwise TEB configurations, some other modes were amplified from the baseline case under part-span TEB conditions. Part-span TEB was thus found to be less modally-robust than full-span TEB.
机译：造成压缩机叶片高周疲劳的主要原因是对上游一排定子或进气导向叶片产生的空气动力作用的响应。在某些转子速度下，对发动机指令励磁的共振响应尤其有害。研究表明，通过后缘吹气（TEB）进行的流量控制可以降低定子的尾流强度，并降低由定子-转子相互作用引起的下游转子叶片振动的幅度。在本研究中，在现代单级跨音速压缩机装置中评估了TEB减少强迫叶片振动的有效性。一排具有TEB功能的尾流发生器（WG）叶片安装在风扇叶盘的上游，其叶片装有应变计。收集了一系列转子速度范围内各种TEB条件的数据，包括一个基本和多个谐波共振交叉点。对于多种模式，记录了谐振响应幅度对全跨度TEB流量以及最佳TEB流量的敏感性。谐振响应灵敏度的特征通常是具有明显衰减的稳健区域，因此，TEB流量不足可能是适当的设计折衷。当全跨度TEB占钻机总进口流量的1.1％时，第一扭转模式的基本交叉振幅降低了多达85％。对于各种谐波交叉点，也实现了类似的降低，包括使用全流量TEB的钻机流量的0.74％，将第二个前缘弯曲模式共振响应降低了94％。在钻机流量的0.5％至0.9％的宽流量范围内，所有模态交叉都至少减少了32％。因此，结果证明了全跨度TEB的模态和流量稳健性可降低现代紧凑型跨音速压缩机中的强制响应。通常发现跨度的TEB覆盖率降低会减少峰减少。还注意到振动模式对翼展方向TEB分布的敏感性变化很大。对于所有翼展方向的TEB配置，第二弦向模式的最大响应降低幅度大致相同，为80％，但在部分跨度TEB条件下，从基线情况中放大了一些其他模式。因此，发现部分跨度的TEB比全跨度的TEB的模态鲁棒性小。

著录项

  • 作者

    Bailie, Samuel Todd.;

  • 作者单位

    Virginia Polytechnic Institute and State University.;

  • 授予单位 Virginia Polytechnic Institute and State University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 164 p.
  • 总页数 164
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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