固体火箭技术2025，Vol.48Issue(2)：299-309,11.DOI:10.7673/j.issn.1006-2793.2025.02.015
基于格心型有限体积法的喷管热应力分析
Nozzle thermal stress analysis based on cell-centred finite volume method
马源 1董瑞 1陈晨 2谭志城 1梁冰 3陈亚楼 1明平剑1
作者信息
- 1. 中山大学 中法核工程与技术学院,珠海 519082
- 2. 西安航天动力技术研究所,固体推进全国重点实验室,西安 710025
- 3. 哈尔滨工程大学 动力与能源工程学院,哈尔滨 150001
- 折叠
摘要
Abstract
Based on the cell-centred finite volume method(CC-FVM),analogous to the finite volume method(FVM)used in computational fluid dynamics(CFD),the CC-FVM elasticity equations were established according to the principle of force equilibri-um by taking the displacements as the solution variables.Aiming at the nonlinear contact problem,the displacement interpolation method was used to calculate the contact penetration.According to the penalty function method and Coulomb friction model,the calcu-lation method of normal stress and friction force was deduced,and the contact stress and interface friction force were calculated.The iterative method was used to solve the nonlinear problem,and the correctness of the new contact stress calculation method was verified by two-dimensional slider and three-dimensional slider examples.Based on this method,the stress and contact stress of a composite material nozzle under cold and hot load conditions were analyzed;the influence of temperature load on the stress distribution of the noz-zle was analyzed;the stress distribution of the nozzle and the concentration area of the contact stress were calculated,and the meas-ures to reduce the contact stress in the nozzle were put forward.The results show that the maximum contact stress between the metal layer and the heat insulation layer occurs at the chamfer of the convergence section.Under normal conditions,the maximum stress of the nozzle is located at the chamfer of the fixed layer and the bolt connection,which is less than the ultimate strength of the material.The thermal load increases the stress of the nozzle fixed layer by 37.5%,and the stress of the non-metal layer increases by 40%.The smooth treatment of the nozzle component joints can effectively reduce the contact stress in these areas.关键词
有限体积法/固体火箭发动机/喷管/接触应力/弹性力学Key words
finite volume method/solid rocket motor/nozzle/contact stress/elastodynamics引用本文复制引用
马源,董瑞,陈晨,谭志城,梁冰,陈亚楼,明平剑..基于格心型有限体积法的喷管热应力分析[J].固体火箭技术,2025,48(2):299-309,11.
