考虑整机变形的氢氧发动机管路结构静强度分析  

Static structural analysis of pipeline structures of hydrogen/oxygen rocket engine considering structural integral deformation

作　　者：柳恺骋 刘曌俞 王新军 郑孟伟[1,2] 李晶 LIU Kaicheng;LIU Zhaoyu;WANG Xinjun;ZHENG Mengwei;LI Jing(Beijing Aerospace Propulsion Institute,Beijing 100076,China;Laboratory of Cryogenic Liquid Propulsion Technology,Beijing 100076,China;Beijing Institute of Structure and Environment Engineering,Beijing 100076,China)

机构地区：[1]北京航天动力研究所,北京100076 [2]低温液体推进技术实验室,北京100076 [3]北京强度环境研究所,北京100076

出　　处：《火箭推进》2024年第3期83-89,共7页Journal of Rocket Propulsion

基　　金：中国工程院战略研究与咨询项目(2022-XY-06)。

摘　　要：为了在液体火箭发动机管路结构静强度分析时考虑整机变形的影响,采用以实体单元、壳单元和梁单元为主的建模方法,建立了大推力补燃氢氧发动机试验装置的有限元模型,在热载荷、压力载荷和重力载荷的共同作用下,基于整机模型对管路结构进行了静力计算,并将计算结果与试验测量结果进行了对比。在此基础上,计算了不同类型载荷作用下的整机变形,重点分析了温度载荷的影响。对于典型管路,进一步采用子模型方法计算了不同类型载荷作用下的管路应力,对比了是否考虑整机变形对管路应力水平的影响。结果表明:基于整机模型进行的静力仿真基本能够正确反映出发动机热试验状态下各管路结构的受力状态;对氢氧发动机而言,温度载荷对整机变形的影响最大,整机变形对管路结构应力水平的影响较大且不容忽视,故有必要考虑整机变形对管路结构的影响来进行静强度分析。In order to take the structural integral deformation into consideration during the static structural analysis for pipeline structures of the liquid rocket engine,the finite element model of the large-thrust staged combustion cycle hydrogen/oxygen engine was established using solid,shell and beam elements.Meanwhile,the static structural analysis was performed under the joint action of the thermal,pressure and gravity loads.The simulation results were compared with the measured data from the ground firing test.Based on this,the integral deformation of the engine was calculated under different types of loads and the influence of thermal load was analyzed.For typical pipeline structures,the stress distribution was calculated under different types of loads with the submodel method and the influence of the integral deformation on stress level was further investigated.The results show the static structural analysis of the established finite element model could basically reflect the stress state of the engine under the ground firing test state.For hydrogen/oxygen rocket engine,the thermal load has the greatest influence on the integral deformation of the engine,which need to be considered during strength analysis for pipeline structures of the engine.

关 键 词：氢氧发动机 管路 静强度分析 整机变形 子模型 

分 类 号：V414.1[航空宇航科学与技术—航空宇航推进理论与工程]