固体火箭发动机碳基材料喷管机械侵蚀特性

发布时间：2018-01-17 14:27

本文关键词：固体火箭发动机碳基材料喷管机械侵蚀特性　出处：《航空动力学报》2016年03期 　论文类型：期刊论文

【摘要】：为研究碳基材料喷管的机械侵蚀特性,基于两相流理论和经验公式,考虑液滴的蒸发与反应,建立了二维轴对称碳基材料喷管机械侵蚀计算模型.针对15-lb BATES发动机喷管进行了机械侵蚀计算,研究了液滴轨迹、机械侵蚀情况的分布规律,以及推进剂中Al质量分数和燃烧室压强对机械侵蚀的影响.结果表明:机械侵蚀率计算最大值为55μm/s,在实验结果范围内.Al/Al2O3混合液滴是机械侵蚀的主要因素,Al液滴由于蒸发氧化而不对壁面造成碰撞.机械侵蚀发生在喷管收敛段,峰值位于喉部上游入口处,喉部和扩张段无机械侵蚀现象.推进剂中Al质量分数增加对机械侵蚀率无显著规律性影响.机械侵蚀率随燃烧室压强的增加呈超线性增长.
[Abstract]:In order to study the mechanical erosion characteristics of carbon-based nozzle, evaporation and reaction of droplets are considered based on two-phase flow theory and empirical formula. The mechanical erosion calculation model of 2-D axisymmetric carbon-based nozzle was established. The mechanical erosion calculation of 15-lb BATES engine nozzle was carried out, and the droplet trajectory was studied. The distribution of mechanical erosion and the influence of Al content in propellant and combustion chamber pressure on mechanical erosion are studied. The results show that the maximum value of mechanical erosion is 55 渭 m / s. In the range of experimental results, the Al / Al _ 2O _ 3 mixed droplet is the main factor of mechanical erosion. The Al droplet does not collide with the wall due to evaporation and oxidation. The mechanical erosion occurs in the convergent section of the nozzle. The peak is located at the upstream entrance of the larynx. There is no mechanical erosion in the throat and expansion section. The increase of Al content in the propellant has no significant effect on the mechanical erosion rate. The mechanical erosion rate increases superlinearly with the increase of combustion chamber pressure.
【作者单位】：北京航空航天大学宇航学院;中国航天科技集团公司中国运载火箭技术研究院研发中心;
【分类号】：V435
【正文快照】： 符号说明ρ密度(kg/m3)t时间(s)x轴向坐标(m)y径向坐标(m)u速度(m/s)m质量(kg)m·质量流量(kg/s)p压强(Pa)τ=Reynolds应力张量(Pa)F作用力(N)Fdrag曳力(N)Fpressure压差力(N)h比焓(J/kg)q传热速率(W/m2)Cd曳力系数Er机械侵蚀率(m/s)er机械侵蚀系数Af碰撞面面积(m2)π碰撞区域

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