火箭推进

基于高超声速预冷发动机闭式氦布雷顿循环中印刷电路板换热器(PCHE)的应用,对PCHE氢氦通道的热固耦合特性进行了数值研究,着重阐述了热侧氦参数对换热的影响机制。探究了热侧壁温和换热系数的变化特征及其对冷侧换热的影响。考察了通道截面温度和湍动能的分布情况。通过熵产和综合换热系数评价了PCHE通道的性能,进行了通道热应力分析,建立了热侧和冷侧换热关联式(误差在±15以内)。结果表明:热侧压力对换热仅有微弱影响; 热侧流量提高对热侧和冷侧换热均有增强作用。热侧进口温度下降导致热侧和冷侧换热减弱; 热侧进口温度提高造成通道熵产显著增加,热侧流量增加造成通道熵产显著减小; 高热应力出现在冷热流道之间和壁面两侧,局部最大热应力达到25 MPa。

Based on the application of printed circuit heat exchanger(PCHE)in the closed helium Brayton cycle of hypersonic precooled engine, the thermal-solid coupling characteristics of hydrogen-helium PCHE channel were numerically studied, and the effect mechanisms of hot-side helium parameters on heat transfer were emphatically expounded.The variation characteristics of hot-side wall temperature and heat transfer coefficient and the effect on cold-side heat transfer were investigated.The distributions of temperature and turbulent kinetic energy in channel cross-section were analyzed.The performance of PCHE channel was evaluated by the entropy generation and the comprehensive heat transfer coefficient, the thermal stress of channel was analyzed, and the heat transfer correlations of hot-side and cold-side were established(error within ±15).The results show that the hot-side pressure has only a weak effect on the heat transfer.The heat transfer of hot-side and cold-side is enhanced with the increase of hot-side mass flux.The decrease of hot-side inlet temperature causes the weakened heat transfer both of the hot-side and the cold-side.The increase of hot-side inlet temperature leads to the significant increase of channel entropy generation, and the increase of hot-side mass flux results in a significant decrease of entropy generation.High thermal stress occurs between the hot and cold flow channels and the side-walls, the maximum local thermal stress reaches 25 MPa.

引言
1 数值模型
2 数值结果与分析
3 结论

图1 通道模型与网格(单位:mm)<br/>Fig.1 Model and mesh of channel(unit:mm)

图1 通道模型与网格(单位:mm)
Fig.1 Model and mesh of channel(unit:mm)

图2 热物性随温度的变化<br/>Fig.2 Thermal properties variations with temperature

图2 热物性随温度的变化
Fig.2 Thermal properties variations with temperature

图3 出口温度随热侧进口温度的变化情况<br/>Fig.3 Variation of outlet temperature with hot-side inlet temperature

图3 出口温度随热侧进口温度的变化情况
Fig.3 Variation of outlet temperature with hot-side inlet temperature

表1 计算工况
Tab.1 Calculated conditions

图4 Twi,av,h和hav,h沿流动方向的变化情况<br/>Fig.4 Variations of Twi,av,h and hav,h along the flow direction

图4 Twi,av,h和hav,h沿流动方向的变化情况
Fig.4 Variations of Twi,av,h and hav,h along the flow direction

图5 Twi,av,c和hav,c沿流动方向的变化情况<br/>Fig.5 Variations of Twi,av,c and hav,c along the flow direction

图5 Twi,av,c和hav,c沿流动方向的变化情况
Fig.5 Variations of Twi,av,c and hav,c along the flow direction

图6 壁面温度的周向分布情况<br/>Fig.6 Circumferential distribution of wall temperature

图6 壁面温度的周向分布情况
Fig.6 Circumferential distribution of wall temperature

图7 通道截面的温度分布情况<br/>Fig.7 Temperature distribution in the channel cross-section

图7 通道截面的温度分布情况
Fig.7 Temperature distribution in the channel cross-section

图8 热侧湍动能分布情况<br/>Fig.8 Distribution of hot-side turbulent kinetic energy

图8 热侧湍动能分布情况
Fig.8 Distribution of hot-side turbulent kinetic energy

表2 不同热侧条件下的热力参数<br/>Tab.2 Thermal parameters at different hot-side conditions

表2 不同热侧条件下的热力参数
Tab.2 Thermal parameters at different hot-side conditions

表3 不同热侧条件下的综合换热系数<br/>Tab.3 Comprehensive heat transfer coefficient at different hot-side conditions

表3 不同热侧条件下的综合换热系数
Tab.3 Comprehensive heat transfer coefficient at different hot-side conditions

图9 通道截面的热应力分布情况<br/>Fig.9 Thermal stress distributions in the channel cross-section

图9 通道截面的热应力分布情况
Fig.9 Thermal stress distributions in the channel cross-section

图10 热应力沿热侧流动方向的变化情况<br/>Fig.10 Thermal stress variation along the hot-side flow direction

图10 热应力沿热侧流动方向的变化情况
Fig.10 Thermal stress variation along the hot-side flow direction

图11 热侧参数对热应力沿热侧流动方向变化的影响<br/>Fig.11 Effects of hot-side parameters on thermal stress variation along the hot-side flow direction

图11 热侧参数对热应力沿热侧流动方向变化的影响
Fig.11 Effects of hot-side parameters on thermal stress variation along the hot-side flow direction

图12 Nu预测值与数值结果对比情况<br/>Fig.12 Comparison of Nu between prediction values and numerical results

图12 Nu预测值与数值结果对比情况
Fig.12 Comparison of Nu between prediction values and numerical results

图13 Nu预测值与实验结果对比情况<br/>Fig.13 Comparison of Nu between prediction values and experience results

图13 Nu预测值与实验结果对比情况
Fig.13 Comparison of Nu between prediction values and experience results

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备注

引言

1 数值模型

2 数值结果与分析

3 结论

期刊信息