| 摘要: |
| 为了判断弹射动力系统燃气发生器工作的安全性，需要预示工作过程中燃气发生器壳体的力学响应。基于软件CFX和ANSYS，建立了燃气发生器复合结构流热固耦合仿真模型。对燃气发生器内流场和结构温度场进行流热耦合计算，并将壳体温度场计算结果与试验数据进行对比，再将算得的燃气压强分布与结构温度场分布导入ANSYS以计算结构的力学响应。计算结果表明，燃气发生器工作过程中，直筒段最高温度点位于直筒段与后封头连接的绝热层缝隙处，后封头最高温度点位于后封头与喉衬配合部位的上游端。结构最高温度值仅354K，说明热防护良好；直筒段和后封头壳体主体区域应力安全系数>3，满足设计要求，而在法兰附近圆角过渡处外壁存在应力集中，最大应力处安全系数降为1.13，燃气发生器壳体仍处于安全状态，但存在安全裕度显著降低的风险。 |
| 关键词: 弹射动力系统 燃气发生器 流热固耦合 流场 温度场 应力场 |
| DOI：10.13675/j.cnki.tjjs.200767 |
| 分类号:V435 |
| 基金项目: |
|
| Fluid-Heat-Solid Coupling Numerical Study on Gas Generator of Ejection Power System |
|
CHEN Qi-fei1, CHEN Shu-wei2, LIU Shi-jie3, LIANG Guo-zhu1, WANG Tai-kun2
|
|
1.School of Astronautics,Beihang University,Beijing 102206,China;2.No.713 Research Institute,China Shipbuilding Industry Corporation,Zhengzhou 201108,China;3.School of Mathematics and Systems Science,Beihang University,Beijing 102206,China
|
| Abstract: |
| In order to assess the working safety of gas generator in ejection power system， it is necessary to predict the mechanical response state of the gas generator shell in the working process. Based on software CFX and ANSYS， the fluid-thermal-solid coupling model of gas generator composite structure was established. The flow field and the temperature field in the gas generator were simulated by fluid-thermal coupling method， and the outer wall temperature was compared with the test data， then the simulated gas pressure and structural temperature distribution were imported into ANSYS to calculate the structural mechanical response. The simulation results show that， during the working process of the gas generator， the maximum temperature region of the straight tube section is located at the insulation layer clearance between the straight tube section and the rear head， and the maximum temperature region of the rear head is at the front end of mating surface of the head and throat liner.The maximum structural temperature is 354K， indicating fine insulation protection. The safety factors of stress in the main area of the straight barrel section and the rear head shell are greater than 3， meeting the design requirements， while the stress concentration exists in the outer wall near the circular corner transition of the flange， and the safety factor at the maximum stress region is 1.13， which indicates that the gas generator shell is in a safe state， but there is a risk of a significant reduction in safety margin. |
| Key words: Ejection power system Gas generator Fluid-heat-solid coupling Flow field Temperature field Stress field |
