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PDF(5020 KB)
PDF(5020 KB)
发汗冷却用镍基泡沫孔隙尺度流动传热特性研究
Study on Pore Scale Flow and Heat Transfer Characteristics of Nickel-based Foam for Transpiration Cooling
以发汗冷却用镍基合金泡沫为研究对象,采用X-CT扫描技术重构获得其真实的微细观结构,基于多松弛格子玻尔兹曼方法(MRT-LBM), 结合GPU加速技术,建立发汗冷却用镍基合金泡沫多孔材料的孔隙尺度导热-对流复合传热数值模拟方案。以空气为冷却介质,重点分析镍基合金泡沫在不同雷诺数条件下的流动传热特性。结果表明,镍基合金泡沫的流动存在明显的达西区、过渡区和强惯性区,临界雷诺数为1.36×10-1。并且,随着雷诺数的增大,虽然流动阻力增大,但传热效率也明显增强。在达西区,传热由导热主导,而过渡区与强惯性区则以强迫对流为主导。综合传热因子与雷诺数呈正相关,即增大雷诺数可有效提高泡沫结构的综合传热性能。研究获得的镍基合金泡沫流动与传热特性,为提高发汗冷却效率提供了一定的理论支撑。
The study investigates nickel-based alloy foam for transpiration cooling, leveraging X-CT scanning technology to reconstruct its microstructures. Based on the multiple-relaxation lattice Boltzmann method (MRT-LBM), combined with GPU acceleration technology, a numerical simulation method for the pore-scale heat conduction and convection compound heat transfer of nickel-based alloy foam porous materials for transpiration cooling is established. Air is used as the cooling medium, with a focus on analyzing the flow and heat transfer characteristics of the nickel-based alloy foam under different Reynolds numbers. The results delineate three distinct flow regimes: the Darcy regime, the Transitional regime, and the Forchheimer regime, with a critical Reynolds number identified at 1.36×10⁻¹. While an increase in Reynolds number elevates flow resistance, it concurrently enhances heat transfer efficiency. Heat transfer within the Darcy regime is predominantly governed by conduction, whereas forced convection dominates in the Transitional and Forchheimer regimes. The overall heat transfer factor is positively correlated with the Reynolds number, indicating that an increase in Reynolds number effectively improves comprehensive heat transfer performance of foam structure. The study on the flow and heat transfer characteristics of nickel-based foam provide theoretical support for enhancing transpiration cooling efficiency.
热学计量 / 镍基合金泡沫 / 格子玻尔兹曼方法 / 渗透率 / 传热特性
thermometrics / nickel-based alloy foam / lattice Boltzmann method / permeability / heat transfer characteristics
| 1 |
陈忠灿, 张凯, 李枫, 等. 发汗冷却技术在飞行器上的应用及展望 [J]. 清华大学学报 (自然科学版), 2024, 64(2): 318-336.
|
| 2 |
梁伟, 金华, 孟松鹤, 等. 高超声速飞行器新型热防护机制研究进展 [J]. 宇航学报, 2021, 42(4): 409-424.
|
| 3 |
吉洪亮, 张长瑞, 曹英斌. 发汗冷却材料研究进展 [J]. 材料导报, 2008, 22(1): 1-3.
|
| 4 |
|
| 5 |
|
| 6 |
|
| 7 |
汪新智, 马军军, 彭稳根, 等. 高超声速飞行器主动冷却系统优化设计 [J]. 航空学报, 2014, 35(3): 624-633.
|
| 8 |
彭稳根. 高超声速飞行器金属结构热管热防护机制理论与模拟研究 [D]. 哈尔滨; 哈尔滨工业大学, 2011.
|
| 9 |
王蕾, 沈剑, 尚绍华. X-43A的分离系统 [J]. 飞航导弹, 2007 (12): 5-10.
|
| 10 |
|
| 11 |
|
| 12 |
|
| 13 |
|
| 14 |
|
| 15 |
|
| 16 |
冯晶森, 闵敬春. 直通道内两相流动的格子玻尔兹曼方法模拟 [J]. 物理学报, 2023, 72(8): 194-204.
|
| 17 |
|
| 18 |
张超, 孔祥壮, 杜雁霞, 等. 各向异性Kelvin泡沫胞元高径比对其流动传热特性的影响 [J]. 空气动力学学报, 2024, 42(1): 55-66.
|
| 19 |
|
| 20 |
邵宝力, 王淑彦, 田瑞超, 等. 孔隙介质内流体渗流的三维格子Boltzmann模拟 [J]. 高校化学工程学报, 2018, 32(5): 1073-1081.
|
| 21 |
|
/
| 〈 |
|
〉 |