某型航空发动机锯齿冠涡轮叶片叶冠间隙扩展规律研究

以某型航空发动机锯齿冠涡轮叶片实际外场叶冠间隙监控数据为统计样本,开展了叶片叶冠间隙扩展规律的统计分析与研究,包括叶冠间隙扩展典型规律和扩展速率的统计分析,松动叶片数量与叶冠间隙的对应关系以及叶冠出现间隙的发动机使用情况的统计分析。结果表明:叶冠间隙存在稳态扩展和异常扩展阶段,且松动叶片数量与叶冠总间隙之间存在一定的比例关系,可为叶冠间隙外场监控提供参考和依据。

A Statistically Study on the Shroud Clearance Expansion Rules of Serrrated-Shroud Turbine Blade for an Aeroengine

Based on the records of the clearance between shrouds of the serrated-shroud turbine blade for an aeroengine, which is practically measured in outfield, this paper carried out statistically analysis and study on the regulations of the shroud clearance expansion, including outlining the typical expansion curve for the shroud clearance, the correlation study between the shaking blade number and shroud clearance, plus the statistically analysis on the overall service presentation. Results show that the accumulate clearance between shrouds has both stable and unstable expansion periods, and also the loose blades number is roughly parallel to the accumulated clearance, which can be used in laying out a more reasonable, effective and easy-operated monitoring and controlling methods on the turbine blade shroud clearance for outfield.