Numerical simulation of influence of heat shield structure on nozzle wall cooling
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摘要:
以加力状态下的轴对称喷管为研究对象，数值对比研究了隔热屏翻边方式对喷管壁面冷却的影响。结果表明：无论对隔热屏进行两侧翻边还是出口翻边，隔热屏的最高温度和平均温度随着翻边高度的增加呈现先减小后增加的变化规律；对隔热屏进行两侧翻边会增加收敛段壁面的平均温度和最高温度。相反，出口翻边则会降低收敛段壁面的最高温度和平均温度；两侧翻边时，扩张段壁面最高温度和平均温度最多可以降低2.6%和1.1%。出口翻边时，扩张段壁面的最高温度和平均温度受翻边高度影响较大，分别最多可以下降14.6%和23.5%。当以喷管扩张段壁面的冷却为研究目标时，则出口翻边更有利于喷管壁面冷却。
Abstract:Using the axisymmetric nozzle under the afterburner as the research object, the effects of flanging methods of heat shield on nozzle cooling were studied numerically. The results show that regardless of whether the heat shield is flanged on both sides or at the outlet, the maximum and average temperatures of the heat shield show a pattern of first decreasing and then increasing with the increase of flanging height; flipping both sides of the heat shield can increase the average and maximum temperatures of the convergent section wall. On the contrary, outlet flanging can reduce the maximum and average temperatures of the convergent section wall; in case of flanging on both sides, the maximum and average wall temperatures of the divergent section can be reduced by up to 2.6% and 1.1%. During outlet flanging, the maximum and average temperatures of the divergent section wall are greatly affected, and can be reduced by up to 14.6% and 23.5%, respectively. When the cooling of the nozzle divergent section wall is taken as the research objective, the outlet flanging is more conducive to the cooling of the nozzle wall.
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图 4 翻边隔热屏局部示意图（单位：mm）
Figure 4. Partial schematic diagram of flanging heat shield（unit：mm）
图 13 加力燃烧室出口温度对比验证
Figure 13. Comparison and verification of afterburner outlet temperature and test data
图 14 调节片壁面温度对比验证
Figure 14. Comparative verification of the wall temperature of the regulating plate
图 17 喷管内外壁面压力分布与试验数据对比图
Figure 17. Comparison between pressure distribution on the inner and outer walls of the nozzle and experimental data
图 18 不同翻边结构下的压力对比云图
Figure 18. Comparison contours of pressure under different flanging structures
图 19 不同翻边结构下的冷却气体质量流量对比图
Figure 19. Comparison diagram of cooling gas mass flow rate under different flanging structures
图 20 不同翻边结构下的温度对比云图
Figure 20. Comparison contours of temperature under different flanging structures
图 21 隔热屏温度对比云图（出口翻边）
Figure 21. Comparison contours of heat shield temperature （outlet flanging）
图 22 隔热屏温度对比云图（两侧翻边）
Figure 22. Comparison contours of heat shield temperature（both sides flanging）
图 23 不同翻边结构下的隔热屏最高温度对比图
Figure 23. Comparison diagram of maximum temperature of heat shield under different flanging structures
图 24 不同翻边结构下的隔热屏平均温度对比图
Figure 24. Comparison diagram of average temperature of heat shield under different flange structures
图 25 不同翻边结构下的收敛段壁面温度对比云图
Figure 25. Comparison contours of wall temperature at convergence section under different flanging structures
图 26 不同翻边结构下的收敛段最高温度对比图
Figure 26. Comparison diagram of maximum temperature at convergence section under different flanging structures
图 27 不同翻边结构下的收敛段平均温度对比图
Figure 27. Comparison diagram of average temperature of convergence section under different flanging structures
图 29 不同翻边高度下的流线图（出口翻边）
Figure 29. Streamline diagram under different flanging heights （outlet flanging）
图 30 不同翻边高度下的流线图（两侧翻边）
Figure 30. Streamline diagram under different flanging heights （both sides flanging）
图 31 不同翻边结构下的流线侧视图
Figure 31. Streamline side view under different flanging structures
图 32 扩张段温度分布图（两侧翻边）
Figure 32. Temperature distribution diagram of expansion section （both sides flanging）
图 33 扩张段温度分布图（出口翻边）
Figure 33. Temperature distribution diagram of expansion section （outlet flanging）
图 34 扩张段流线图（出口翻边5 mm）
Figure 34. Expansion section streamline diagram（outlet flanging 5 mm）
图 35 不同翻边结构下的扩张段最高温度对比图
Figure 35. Comparison diagram of maximum temperature of expansion section under different flanging structures
图 36 不同翻边结构下的扩张段平均温度对比图
Figure 36. Comparison diagram of average temperature of expansion section under different flanging structures
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