航空发动机整机结构效率评估参数与计算方法

根据航空发动机整机结构系统功能和设计要求，对整机结构效率内涵进行了详细阐述，基于整机载荷特征，建立了从抗变形能力和力学环境适应能力两方面对整机进行结构效率评估的参数体系.通过对转静间隙变化量、应变能分布系数、敏感度系数等评估参数归一化方法及结构效率系数运算法则的建立，明确了结构效率的分析流程.以某小涵道比涡扇发动机为对象进行结构效率评估，详细给出了结构效率的计算过程.针对该小涵道比涡扇发动机的另一种结构方案2，基于结构效率评估方法进行评估并与原结构方案进行了对比分析，结果表明:原结构方案在抗变形能力和力学环境适应能力两方面均优于结构方案2，结构效率系数比结构方案2高出0.11，初步验证了结构效率评估方法的工程实用性. 

Evaluation parameters and calculation methods of structural efficiency for whole aero-engine

Based on the functions and design requirements of aero-engine, the intensions of whole structure efficiency were elaborated in detail. Considering the load feature of whole structure, the evaluation parameters of whole structure efficiency were put forward from both the deformation resistance and dynamic environment adaptability. By establishing the normalization method of evaluation parameters such as rotor-to-stator clearance variation, strain energy distribution coefficient and sensitivity coefficient and the operation rule of structure efficiency coefficient, the analysis process of structure efficiency was defined. A structural efficiency assessment on low bypass ratio turbofan engine was conducted, by which the calculation process of the structure efficiency evaluation was given in detail. A structure scheme 2 was introduced based on the original structure scheme of the low bypass ratio turbofan engine, and then was compared with the original structure scheme based on the structure efficiency evaluation method. Result shows that the original structure is superior to the structure 2 both in the deformation resistance and the dynamic environment adaptability, and its structure efficiency coefficient is 0.11, which is higher than the structure 2, validating the practicability of the proposed structural efficiency evaluation method.