冲压发动机热结构振动环境预示研究

目的研究脉动压力作用下冲压发动机燃烧室热结构振动环境预示方法。方法建立发动机结构的力学模型,同时开展相应的常温和热模态试验,对有限元模型进行对比、修正,以最终得到的力学模型为基础,分段对发动机结构施加脉动压力,完成冲压发动机脉动压力作用下热振动响应计算,并与试验结果进行对比分析。结果预示结果与试验结果基本相符,验证了所采用的冲压发动机振动响应分析方法和技术途径的可行性和正确性。结论这种热-结构分析方法可用于冲压发动机振动环境预示,同时也可用于优化发动机结构设计,对飞行器研制初期环境预示及结构设计工作具有重要的工程应用价值。

Prediction Method for Thermal-structural-vibrational Environment of Ramjet Engine

Objective To study prediction method for thermal-structural-vibrational environment of ramjet engine under the action of pulsating pressure. Methods A mechanical model was established for the engine structure. The engine structure under normal and high temperature was tested. The finite element model was also compared and corrected. Based on the mechanical model obtained, pulsating pressure was applied to the engine structure in sections to calculate the vibration response of the engine structure. Results The result of prediction was basically in line with that of test. The feasibility and validity of method and technique adopted for vibration response analysis of ramjet engine were verified. Conclusion The thermal-structural analysis method could be used for predicting vibration environment of ramjet engine. Meanwhile, it might also be used for design optimization of ramjet engines. It has important engineering application value for dynamic environment prediction and structure tool design of fight vehicle in the initial development stage.