| 摘要: |
| 针对航空发动机传统的超转保护设计未考虑材料、载荷和制造公差分散性的问题，本文提出了一种基于概率的叶片脱落超转保护设计方法，建立了一种基于响应面法的叶片脱落超转保护设计概率模型，并给出了具体算法，采用多项式拟合叶片脱落超转保护设计极限状态函数，利用Monte Carlo方法获取了轮盘破裂转速分布和叶片脱落转速分布。运用概率设计方法对某发动机涡轮转子进行叶片脱落超转保护设计，结果表明：与传统方法相比，基于叶片脱落超转保护设计概率模型设计的轮盘破裂转速均值降低了约5.4%，轮盘质量减轻了约7.2%。 |
| 关键词: 航空发动机 超转保护 概率 叶片脱落 轮盘破裂 设计裕度 |
| DOI：10.13675/j.cnki.tjjs.210565 |
| 分类号:V252.2 |
| 基金项目:航空科学基金（KYHJ150182）。 |
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| Probabilistic Design Methodology Research for Blade Shedding Based Overspeed Protection |
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MENG Wei-hua1,2,3, LI Jian2, ZHANG Zhi-yi2, LI Lei1, XU You-liang2
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1.School of Mechanics，Civil Engineering and Architecture，Northwestern Polytechnical University， Xi’an 710072，China;2.AECC Hunan Aviation Powerplant Research Institute，Zhuzhou 412002，China;3.United Research Center of Mid-Small Aero-Engine，Zhuzhou 412002，China
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| Abstract: |
| Traditional aero-engine overspeed protection design can not consider material property differences， load fluctuation and manufacturing tolerance.Thus， blade shedding based overspeed protection involving probabilistic design methodology， response surface method based on probabilistic model and detailed calculation process were proposed in the paper. Then， the polynomial was utilized to fit the limit state equation of overspeed protection using blade shedding and the Monte Carlo method was employed to simulate the speed distribution of disk burst and blade shedding. The method was used to design of overspeed protection for a gas turbine rotor. Results show that， compared with traditional methods， the average disk burst speed and the mass of the disk has been reduced approximately by 5.4% and 7.2% respectively. |
| Key words: Aero-engine Overspeed protection Probability Blade shedding Disk burst Design margin |
