涡轮3维叶尖间隙对典型故障特征的响应特性分析

Response Characteristics Analysis of Three-dimensional Blade Tip Clearance to Typical Fault Information

为了有效地克服传统叶尖间隙在航空发动机涡轮叶盘的健康监测中传递信息能力有限的不足,充分考虑了在航空发动机运行过程中涡轮叶片叶尖的3维特征,提出包含径向间隙、叶片叶尖端面轴向偏转角和周向偏转角在内的涡轮3维叶尖间隙的概念,并将3维叶尖间隙特征参量作为叶片故障信号载体,通过有限元方法分析了3维叶尖间隙特征参量对高压涡轮叶片典型裂纹故障的响应特性。结果表明:3维叶尖间隙特征参量对高压涡轮叶片尾缘裂纹的故障特征信息有良好的反映效果。

In order to solve the problem that the ability of traditional turbine blade tip clearance to transmit information is limited during the health monitoring of aeroengine, 3-D features of turbine blade tip were fully used during the operation of aeroengine, and three- dimensional blade tip clearance of turbine was proposed, which includes one-dimensional blade tip radial clearance, axial deflection angle and circumferential deflection angle of blade tip. Three-dimensional blade tip clearance was used as the fault information carrier of blades and the response characteristics of its characteristic parameters to a typical crack fault of high pressure turbine blade were analyzed by finite element analysis method. The results show that characteristic parameters of three-dimensional blade tip clearance can better reflect the fault feature information of a crack on the turbine blade trailing edge.