火箭推进

针对某吸气式发动机可调喷管的扩张调节片开展结构优化研究。根据调节片加筋结构常规布局形式,用壳单元和梁单元来代表薄板和加强筋,建立参数化设计模型,开展多目标优化设计得到常规布局的结构设计方案。通过结构拓扑优化设计并对优化结果进行二次建模,得到工程可行的结构优化方案。对2种方法得到结构方案进行对比,拓扑优化结构方案重量减少14.8%,最大变形减少38%,最大结构应力相当但结构应力分布更加均匀。拓扑优化设计得到的结构方案具有材料利用率高、结构轻、性能好的优点,对于喷管调节片薄壁加筋结构优化问题拓扑优化方法具有良好的工程应用前景。

The structure optimization for divergent flap on variable nozzle of airbreathing engine was studied.According to the conventional stiffener layout of adjusting flap,the parametric model was established.In this model,shell element and beam element were used instead of thin-walled structure and stiffener.Through the multi-objective optimization of this model,the structure scheme of conventional layout was obtained.Topology optimization for divergent flap was carried out.The feasible structure was obtained by re-modeling.By comparing the structures obtained by the above two methods,the weight is reduced by 14.8%,the maximum deformation is reduced by 38%,and the maximum structural stress is equivalent,but the structure stress distribution is more uniform in the topology optimization scheme.The structure scheme by topology optimization has the advantages of high material utilization,light weight and good performance.For the optimal design of thin-walled stiffened structure of variable nozzle flap,the topology optimization has a good prospect in engineering application.

引言
1 可调喷管的扩张调节片算例
2 调节片常规布局多目标优化
3 调节片拓扑优化
4 优化结果对比
5 结论

图1 喷管结构示意图<br/>Fig.1 Nozzle structure diagram

图1 喷管结构示意图
Fig.1 Nozzle structure diagram

图2 扩张调节片载荷示意图<br/>Fig.2 Loads of divergent flap

图2 扩张调节片载荷示意图
Fig.2 Loads of divergent flap

图3 调节片压力载荷分布<br/>Fig.3 Pressure distribution on adjusting flap

图3 调节片压力载荷分布
Fig.3 Pressure distribution on adjusting flap

图4 温度场分布<br/>Fig.4 Temperature field distribution on adjusting flap

图4 温度场分布
Fig.4 Temperature field distribution on adjusting flap

表1 材料参数<br/>Tab.1 Material property parameters

表1 材料参数
Tab.1 Material property parameters

图5 有限元参数化建模<br/>Fig.5 Parametric finite element models

图5 有限元参数化建模
Fig.5 Parametric finite element models

图6 设计输入参数对输出参数的灵敏性<br/>Fig.6 Sensitivity of design input parameters to output parameters

图6 设计输入参数对输出参数的灵敏性
Fig.6 Sensitivity of design input parameters to output parameters

表2 正置正交网格布局计算结果<br/>Tab.2 Calculation results of orthogonal grid layout

表2 正置正交网格布局计算结果
Tab.2 Calculation results of orthogonal grid layout

表3 斜置正交网格布局计算结果<br/>Tab.3 Calculation results of skew grid layout

表3 斜置正交网格布局计算结果
Tab.3 Calculation results of skew grid layout

图7 拓扑优化模型<br/>Fig.7 Topological optimization model

图7 拓扑优化模型
Fig.7 Topological optimization model

图8 拓扑优化计算结果<br/>Fig.8 Topology optimization calculation results

图8 拓扑优化计算结果
Fig.8 Topology optimization calculation results

图9 调节片结构方案<br/>Fig.9 Structure configuration of adjusting flap

图9 调节片结构方案
Fig.9 Structure configuration of adjusting flap

图10 位移和应力云图<br/>Fig.10 Displacement and stress distribution nephogram

图10 位移和应力云图
Fig.10 Displacement and stress distribution nephogram

表4 方案性能对比<br/>Tab.4 Scheme performance comparison

表4 方案性能对比
Tab.4 Scheme performance comparison

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备注

引言

1 可调喷管的扩张调节片算例

2 调节片常规布局多目标优化

3 调节片拓扑优化

4 优化结果对比

5 结论

期刊信息