火箭推进

为了掌握吸气式火箭发动机(SABRE)空气预冷器的流动换热特性,为设计相应类型的预冷器提供技术基础,针对SABRE预冷器最小周期性单元,以数值方法研究了管间距、管排数、空气入射角度及氦气/空气热容量比对预冷器流动换热的影响。研究结果表明:增大管排数和减小管间距,能够增大预冷器换热功率,降低空气出口温度,但会降低空气侧、氦气侧平均换热系数,减弱对流换热能力,增大空气侧总压损失。空气入射角度对空气侧、氦气侧换热影响微小,但对空气侧总压恢复系数影响显著。增大氦气/空气热容量比能够降低空气侧总压损失,增大空气侧、氦气侧平均换热系数,降低空气出口温度。

In order to study the flow and heat transfer characteristics of air precooler in Synergistic Air-Breathing Rocket Engine(SABRE)and provide the technical basis for designing precooler, the effects of tube pitch, tube row, air incidence angle and helium/air heat capacity ratio on the flow and heat transfer of air precooler were numerically studied.The results show that increasing the number of tube rows and reducing the tube spacing can increase the heat transfer power of the precooler and reduce the air outlet temperature.However, they also reduce the average heat transfer coefficient on the air side and helium side, weaken the convective heat transfer coefficient and increase the total pressure loss coefficient of air side.The air incidence angle has little effect on the heat transfer of both sides, but has a significant effect on the total pressure recovery coefficient of air side.Increasing the helium/air heat capacity ratio can reduce the total pressure loss coefficient on the air side, increase the average heat transfer coefficient on both sides, reduce the air outlet temperature and enhance the pre-cooling effect.

引言
1 物理模型和计算方法
2 计算结果与讨论
3 结论

图1 空气预冷器模型<br/>Fig.1 Model of air precooler

图1 空气预冷器模型
Fig.1 Model of air precooler

图2 预冷器计算单元模型<br/>Fig.2 Computational model of air precooler

图2 预冷器计算单元模型
Fig.2 Computational model of air precooler

表1 预冷器计算单元的研究变量取值<br/>Tab.1 Variable values of computational model for precooler

表1 预冷器计算单元的研究变量取值
Tab.1 Variable values of computational model for precooler

图3 不同湍流模型下各排管氦气出口温度数值结果与实验结果比较<br/>Fig.3 Comparison of helium outlet temperature between numerical results and experimental results with different turbulence models

图3 不同湍流模型下各排管氦气出口温度数值结果与实验结果比较
Fig.3 Comparison of helium outlet temperature between numerical results and experimental results with different turbulence models

图4 预冷器空气侧总压损失系数随管间距变化关系<br/>Fig.4 Effects of tube pitch on total pressure loss coefficient of air side

图4 预冷器空气侧总压损失系数随管间距变化关系
Fig.4 Effects of tube pitch on total pressure loss coefficient of air side

图5 预冷器空气侧、氦气侧平均换热系数随管间距变化关系<br/>Fig.5 Effects of tube pitch on heat transfer coefficient of both sides

图5 预冷器空气侧、氦气侧平均换热系数随管间距变化关系
Fig.5 Effects of tube pitch on heat transfer coefficient of both sides

图6 预冷器空气出口温度和预冷器换热功率随管间距变化关系<br/>Fig.6 Effects of tube pitch on air outlet temperature and heat transfer power

图6 预冷器空气出口温度和预冷器换热功率随管间距变化关系
Fig.6 Effects of tube pitch on air outlet temperature and heat transfer power

图7 预冷器空气侧总压损失系数随管排数变化关系<br/>Fig.7 Effects of row number on total pressure loss coefficient of air side

图7 预冷器空气侧总压损失系数随管排数变化关系
Fig.7 Effects of row number on total pressure loss coefficient of air side

图8 预冷器空气侧、氦气侧平均换热系数随管排数变化关系<br/>Fig.8 Effects of row number on heat transfer coefficient of both sides

图8 预冷器空气侧、氦气侧平均换热系数随管排数变化关系
Fig.8 Effects of row number on heat transfer coefficient of both sides

图9 预冷器空气出口温度和预冷器换热功率随管排数变化关系<br/>Fig.9 Effects of row number on outlet temperature and heat transfer power

图9 预冷器空气出口温度和预冷器换热功率随管排数变化关系
Fig.9 Effects of row number on outlet temperature and heat transfer power

图10 空气侧总压损失系数随空气入射角度的变化关系<br/>Fig.10 Effects of incidence angle on total pressure loss coefficient of air side

图10 空气侧总压损失系数随空气入射角度的变化关系
Fig.10 Effects of incidence angle on total pressure loss coefficient of air side

图11 不同入射角度下预冷器计算单元中截面流场图<br/>Fig.11 Flow field of middle section under different incidence angles

图11 不同入射角度下预冷器计算单元中截面流场图
Fig.11 Flow field of middle section under different incidence angles

图12 预冷器空气侧、氦气侧平均换热系数随空气入射角度变化关系<br/>Fig.12 Effects of incidence angle on heat transfer coefficient of both sides

图12 预冷器空气侧、氦气侧平均换热系数随空气入射角度变化关系
Fig.12 Effects of incidence angle on heat transfer coefficient of both sides

图13 空气侧总压损失系数随氦气/空气热容量比的变化关系<br/>Fig.13 Effects of heat capacity ratio on total pressure loss coefficient of air side

图13 空气侧总压损失系数随氦气/空气热容量比的变化关系
Fig.13 Effects of heat capacity ratio on total pressure loss coefficient of air side

图14 预冷器空气侧、氦气侧平均换热系数随氦气/空气热容量比变化关系<br/>Fig.14 Effects of He/Air heat capacity ratio on heat transfer coefficient of both sides

图14 预冷器空气侧、氦气侧平均换热系数随氦气/空气热容量比变化关系
Fig.14 Effects of He/Air heat capacity ratio on heat transfer coefficient of both sides

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备注

引言

1 物理模型和计算方法

2 计算结果与讨论

3 结论

期刊信息