Plume flow field and base heating environment of the multi-nozzle rocket in ascent phase
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摘要:
针对多喷管并联运载火箭上升段羽流流场结构与底部加热导致的火箭热防护问题,建立了九喷管构型运载火箭分析模型,通过数值仿真研究了不同高度下的羽流流场及底部热环境现象。通过与风洞试验数据对比,验证了数值方法的可靠性。分析结果表明:多喷管运载火箭上升段射流间发生碰撞,不同海拔高度分别出现了循环涡、燃气回流以及反溅等现象,高度越高,射流膨胀角越大。飞行高度较低时,箭体底部加热主要以辐射加热为主;随着高度增加,对流加热的影响增大。底部热流密度峰值出现在30~40 km范围内,对流热流密度最大为318.16 kW/m2,辐射热流密度最大为315.38 kW/m2,总热流密度最大为570.31 kW/m2 。底板温度梯度是对流加热的主要影响因素,辐射加热主要受辐射强度、距离及辐射微元面积影响。
Abstract:A nine-nozzle configuration rocket was established for the heating protection problem of the multi-nozzle rocket caused by the plume flow field structure and base heating in the ascent phase. Compared with the wind tunnel test data, the reliability of the numerical method was verified, and the numerical simulations were carried out for the plume flow field and the base heating environment at different altitudes. The results indicated that collisions occurred between gas jets, and there existed circulation vortices, gas backflow and back splash at different altitudes. The higher altitude indicated the greater expansion angle of the jet. At low flight altitudes, the base heating was mainly affected by radiation heating, and as the altitude increased, the effect of convection heating was enhanced. The peak of base heating flow density occurred within the range of 30 km to 40 km, with a maximum convective heating flow density of 318.16 kW/m2, a maximum radiant heating flow density of 315.38 kW/m2 and a maximum total heating flow density of 570.31 kW/m2. The temperature gradient of rocket base was the main influence on convection heating, while radiation heating was mainly influenced by the radiation intensity, distance and area of the radiation micro-element.
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表 1 气体摩尔分数
Table 1. Molar percentage of gases
气体组分 摩尔分数/% ${{\mathrm{H}}_2}{\mathrm{O}}$ 0.3741 ${\mathrm{C}}{{\mathrm{O}}_2}$ 0.2932 ${\mathrm{CO}}$ 0.2404 ${{\mathrm{H}}_2}$ 0.0301 ${\mathrm{OH}}$ 0.0229 ${{\mathrm{O}}_2}$ 0.0126 其他 0.0267 表 2 环境参数
Table 2. Atmospheric environmental parameters
工况 飞行高度/km 来流马赫数 压强/Pa 温度/K 1 5 0.65 54019.91 255.65 2 10 1.28 26436.23 223.15 3 16 1.81 12044.60 216.65 4 25 2.83 2511.02 221.65 5 35 3.62 558.92 237.05 6 45 4.24 143.13 265.05 7 50 4.87 75.94 270.65 8 55 5.70 39.97 259.45 9 65 7.25 9.92 231.45 -
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