碳/碳燃气舵热-结构数值模拟分析  

Numerical Analysis on Thermostructure of C/C Composites Jet Vane

作　　者：刘丽丽[1] 李克智[1] 李贺军[1] 沈学涛[1] 

机构地区：[1]西北工业大学碳/碳复合材料工程技术研究中心凝固技术国家重点实验室,西安710072

出　　处：《机械科学与技术》2011年第5期793-796,803,共5页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(90716024)资助

摘　　要：准确的模拟分析碳/碳(C/C)燃气舵在实际工作环境中的温度场和热应力分布是其热防护结构设计的关键。基于有限元理论,运用ANSYS软件对C/C燃气舵的热-结构进行数值模拟,通过考虑热传导、热对流和热辐射三种传热形式对C/C燃气舵温度场的耦合作用,研究了C/C燃气舵的瞬态温度场和热应力分布与演化。模拟结果表明:随着工作时间增加,整个C/C燃气舵的温度升高,热应力明显增大,5 s后温度场趋于稳定;C/C燃气舵的根部和刃口处应力较大,温度最大值出现在刃口处,该处极易被烧穿。In order to improve the thermo-protection structure design of carbon/carbon composite jet vane,it is necessary to carry out numerical simulation and analysis of temperature field and thermal stress distribution under working environment.Based on finite element theory,the thermostructure of carbon/carbon composite jet vane was analyzed by ANSYS software.The coupled influence of three heat transfer forms of thermal conduction,convection and radiation was taken into consideration,and the distribution and evolution of transient temperature field and thermal stress field of carbon/carbon composite jet vane was studied.The results show that,with increasing working time,the temperature and thermal stress increase.The temperature field keeps gradually stable after 5s.The larger thermal stress appears on the root and cutting edge of the jet vane.The highest temperature and thermal stress lie in the cutting edge,which can result in the breakage of the cutting edge materials.Therefore,the cutting edge is burnt through easily.

关 键 词：C/C复合材料 燃气舵 数值模拟 温度场 热应力 

分 类 号：TB332[一般工业技术—材料科学与工程]