火箭推进

为了研究液体火箭发动机柔性金属软管编织网套的增强机理,开展了网套拉伸试验,并基于APDL建立了网套建模及非线性有限元分析参数化程序,数值计算与试验结果一致性较好。研究了承压状态下编织网套对金属软管的增强机理及相互作用模式,建立起网套径向位移与周向应力、等效压力以及摩擦阻力的耦合关系,给出了基于有限元解定量评估网套增强能力及校核网套强度的理论分析方法。研究表明,在金属软管承压10 MPa时,网套可分担约20%的内压载荷,网套处于弹性变形状态,铠装环与网套接触摩擦引起的附加轴向力超过50 kN。

In order to investigate the enhancement mechanism of weave net which is used as the enhanced part of the flexible metal hose of liquid rocket engine, the tensile tests were conducted.Based on the APDL language, the modeling and nonlinear finite element method(FEM)analysis were fully programmed.The computational results agreed well with the tensile test results, which proofed that the model and analysis methods were reasonable and feasible.The mutual effects between weave net, bellows and armoured ring under internal pressure were obtained, as well as the enhancement mechanism.The theoretical analysis methods based on FEM results were proposed to analyze the enhancement capacity quantitatively and check the intensity of the weave net, which established the relationships between the radial displacements, hoop stress, equivalent pressure, and frictional resistance.Results shows that the weave net can share 20% of internal pressure 10 MPa, and weave net is in the state of elastic deformation.The additional frictional force caused by contact between weave net and armoured ring is more than 50 kN, which may increase the burden of servo mechanism.

引言
1 网套结构与参数化建模
2 数值计算方法与验证
3 网套结构特性
4 结论

图1 金属软管示意图<br/>Fig.1 Schematic diagram of flexible metal tube

图1 金属软管示意图
Fig.1 Schematic diagram of flexible metal tube

图2 网套局部结构图<br/>Fig.2 Local diagram of meshy hose

图2 网套局部结构图
Fig.2 Local diagram of meshy hose

图3 有限元模型示意图<br/>Fig.3 Schematic diagram of FEM model

图3 有限元模型示意图
Fig.3 Schematic diagram of FEM model

图4 网套轴向拉伸试验装置<br/>Fig.4 The axial tensile test apparatus

图4 网套轴向拉伸试验装置
Fig.4 The axial tensile test apparatus

图5 网套位移分布<br/>Fig.5 The displacements of meshy hose

图5 网套位移分布
Fig.5 The displacements of meshy hose

图6 试验验与有限元结果比较<br/>Fig.6 Comparison of experimental and FEM results

图6 试验验与有限元结果比较
Fig.6 Comparison of experimental and FEM results

图7 周期性有限元模型<br/>Fig.7 The periodic FEM model

图7 周期性有限元模型
Fig.7 The periodic FEM model

图8 内压载荷响应<br/>Fig.8 The structural responses of internal pressure

图8 内压载荷响应
Fig.8 The structural responses of internal pressure

图9 螺旋交叉叠加网套结构示意图<br/>Fig.9 Schematic diagram of helix across structure of meshy hose

图9 螺旋交叉叠加网套结构示意图
Fig.9 Schematic diagram of helix across structure of meshy hose

图10 网套接触作用示意图<br/>Fig.10 Schematic diagram of contact effects of meshy hose

图10 网套接触作用示意图
Fig.10 Schematic diagram of contact effects of meshy hose

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备注

引言

1 网套结构与参数化建模

2 数值计算方法与验证

3 网套结构特性

4 结论

期刊信息