| 邵康,张静静,董龙雷,闫桂荣.燃烧室复杂结构的热振特性研究[J].装备环境工程,2015,12(6):126-132. SHAO Kang,ZHANG Jing-jing,DONG Long-lei,YAN Gui-rong.Thermal-vibration Characteristics of Complex Combustor Structure[J].Equipment Environmental Engineering,2015,12(6):126-132. |
| 燃烧室复杂结构的热振特性研究 |
| Thermal-vibration Characteristics of Complex Combustor Structure |
| 投稿时间：2015-07-15 修订日期：2015-12-15 |
| DOI：10.7643/issn.1672-9242.2015.06.022 |
| 中文关键词: 燃烧室 热环境 振动特性 |
| 英文关键词:combustor thermal environment vibration characteristics |
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| 中文摘要: |
| 目的 提高复杂飞行器结构在服役过程中的安全性和稳定性问题。方法 以复杂结构燃烧室为例， 从数值模拟和试验两方面入手， 研究不同工况下结构的动力学参数随温度变化的规律。结果 随着温度的升高， 模态频率呈下降趋势， 模态阻尼呈升高、 下降再升高的趋势， 加热对结构的模态振型无影响。结论 对于自由-自由状态的燃烧室结构， 在加热的过程中， 影响模态频率下降的主要因素是弹性模量的变化， 热应力和几何非线性的变化可以不考虑。同时通过开展燃烧室结构的自由-自由状态热模态试验验证了数值模拟方法的正确性。 |
| 英文摘要: |
| Objective To improve the safety and stability of the complex aircraft structure in the process of service. Methods Taking the engine combustor of complex aircraft as example, the changing patterns of dynamic parameters along with temperature under different working conditions were investigated numerically and experimentally. Results The results indicated that the modal frequency decreased and the mode damping first raised then fell and finally raised again with the increase of temperature, and heating had no influence on the mode shape of the structure. Conclusion For a free-free configuration combustor, the main cause of decrease in the modal frequency was the change of elastic modulus and the influence of thermal stress and geometric nonlinearity could be ignored in hot environment. Moreover, by conducting the thermal modal test on a free-free configuration combustor, the correctness of the numerical simulation method was verified. |
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