航空发动机

李涵1，2 ，王维民 1，2，3 ，户东方 1，2 ，张旭龙 1，2 ，李天晴 1，2.高转速风扇叶片外物撞击损伤的定量评价方法[J].航空发动机,2023,49(6):54-61

高转速风扇叶片外物撞击损伤的定量评价方法

Quantitative Evaluation Method of Foreign Object Impact Damage of High-speed Fan Blades

DOI：

英文关键词:fan blade foreign object impact quantitative evaluation orthogonal experiment influencing factors aeroengine

基金项目:国家自然科学基金（91860126）资助

作者	单位
李涵1，2 ，王维民 1，2，3 ，户东方 1，2 ，张旭龙 1，2 ，李天晴 1，2	1.北京化工大学机电工程学院，2.高端机械装备健康监控与自愈化北京市重点实验室， 3.发动机健康监控与网络化教育部重点实验室：北京100029

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中文摘要:

外物撞击是造成航空发动机风扇叶片变形、损伤甚至断裂的主要因素。针对外物撞击持续时间短、瞬间载荷大、损伤影响因素多，难以进行定量损伤评价的问题，提出基于叶片损伤参数α的叶片损伤定量评价方法。以发动机风扇叶片受冰撞为例，采用非接触叶尖计时测量方法，对叶片撞击产生的叶尖位移进行监测分析，验证了该方法的可行性。采用瞬态动力学分析方法对叶片经受撞击过程进行全流程仿真模拟，并采用正交试验法定量研究了外物撞击过程中的撞击速度、叶片转速、撞击位置3种因素对叶片损伤参数α的影响，拟合回归方程并绘制了这3种因素的3D响应曲面图，得到各因素的影响权重。结果表明：冰块速度与撞击位置同时下降时，叶片损伤弱化效果显著。该方法可为大型风扇叶片抗外物打击性能设计和在役健康监测提供理论支撑。

英文摘要:

Foreign object impact is the main factor that causes deformation, damage, or even fracture of aeroengine fan blades. Aiming at the problems of short impact duration, large transient load, and multiple damage influencing factors, which make it difficult to conduct quantitative damage evaluation, a quantitative blade damage evaluation method based on the blade damage parameter α was proposed. Tak? ing the ice impact of engine fan blade as an example, the blade tip displacement generated by blade impact was monitored and analyzed based on the non-contact blade tip timing measurement method, and the feasibility of the proposed method was verified. The transient dy? namic analysis method was used to simulate the whole impacting process. The orthogonal experiment method was adopted to quantitatively investigate the effects of impact speed, blade speed, and impact position on the blade damage parameter α during foreign object impact, the regression equations were fitted, the 3D response surface plots of the three factors were plotted, and the influencing weights of each factor were obtained. The results show that the weakening effect of blade damage is significant when the ice velocity and impact position are de? creased simultaneously. The proposed method can provide theoretical support for Impact-resistant performance design and in-service health monitoring of large fan blades.

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