Wear mechanisms at the blade tip seal interface

Wear mechanisms at the blade tip seal interface
复制标题

叶尖密封界面的磨损机制

DOI:
10.1016/j.wear.2018.03.009
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发表时间:
2018
期刊:
影响因子:
5
通讯作者:
Watson M
Watson M
中科院分区:
工程技术1区
文献类型:
--
作者:
Watson M

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在现代燃气涡轮机发动机中,在叶片尖端和压缩机壳体之间的界面处使用可磨损密封件。这些材料优先于叶尖磨损,留下与叶片完美匹配的轨迹,从而改善叶尖处的密封,提高压缩机的效率和失速裕度。两种常见的可磨损材料已经描述了该界面处发生的磨损机制。这些机制的变化与叶片速度,侵入率和耐磨性硬度进行了调查和统计描述。在这项工作中提出的磨损机制和以前建议已被用作线性模型的基础,已被拟合的结果。这些模型已被用来测试质量的机制,并指出哪些过程是知之甚少。该模型与正态分布的残差表明摩擦力系统的力的结果很好地代表了所提出的机制。温度和叶片长度变化结果的相关性较差,表明对这些过程的了解更少。这项工作表明,简单的线性模型的基础上的机械理解的基本过程可以用于描述力。
Abradable seals are used at the interface between blade tips and compressor casings in modern gas turbine engines. These materials wear in preference to the blade tips leaving a track which perfectly fits the blades, thus improving sealing at the blade tip an increasing both efficiency and stall margin of the compressor.The wear mechanisms occurring at this interface have been characterised for two common abradable materials. Changes to these mechanisms with blade speed, incursion rate and abradable hardness have been investigated and described statistically. The wear mechanisms proposed in this work and previously suggested have been used as the foundation for linear models which have been fitted to the results. These models have been used to test the quality of the mechanisms and indicate which processes are poorly understood.The models were well correlated to results for forces with normally distributed residuals indicating rubbing force systems are well represented by the proposed mechanisms. Temperature and blade length change results were less well correlated indicating these processes are more poorly understood. This work shows that simple linear models based on a mechanistic understanding of underlying processes can be used for describing forces.
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