三维针状预成型碳纤维增强碳化硅基复合材料在蒸腾冷却过程中的孔隙分布及渗透原理

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow Pub Date : 2025-03-04 DOI:10.1016/j.ijheatfluidflow.2025.109799

Tao Ding , Xiaoxuan Chen , Ling Zhao , Hainan Zhang , Tian Zhao , Chaoyi Zhu , Shiyu Qian , Lingyun hou , Yi Zhang , Litong Zhang

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引用次数: 0

摘要

以喷气发动机热端部件冷却为背景，研究了碳纤维增强碳化硅基复合材料（C/SiC）的蒸腾冷却问题。比较了不同纤维预制体C/SiC的孔隙分布，选择了三维针状预制体C/SiC （3DN C/SiC）。利用x射线计算机断层扫描（CT）对3DN C/SiC的孔隙结构进行了分析研究，并根据阿基米德原理得到了其孔隙度。最后，基于Darcy-Forchheimer模型，得到了压降流率曲线，计算了3DN C/SiC的渗透率。考虑惯性力和粘性力的影响，分析了3DN C/SiC内部多孔介质流动的特征和机理。结果表明，在孔隙率为47.61%的情况下，3DN C/SiC的渗透率可达3.37 × 10-12 m2，与常用的金属多孔介质接近。作为多孔介质，3DN C/SiC也表现出良好的流动特性。考虑到其耐高温、重量轻、高比强度等其他优点，3DN C/SiC在喷气发动机热防护系统中具有良好的潜力和前景。

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Pore distribution and permeability principles for carbon fiber reinforced silicon carbide matrix composites with three-dimensional needled preform during the transpiration cooling process

Transpiration cooling problem in carbon fiber reinforced silicon carbide matrix composites (C/SiC) was studied based on the context of cooling of jet engine hot-end components. Pore distributions of C/SiC with different fiber preforms were compared, and the C/SiC with three-dimensional needled preform (3DN C/SiC) was selected. The pore structure of 3DN C/SiC was analyzed and studied by X-ray computed tomography scanning (CT), and its porosity was obtained based on the Archimedes’ principle. Finally, based on the Darcy–Forchheimer model, the pressure drop–flow rate curve was obtained and the permeability of 3DN C/SiC was calculated. By considering the influence of inertia and viscous forces, the characteristics and mechanism of the porous media flow inside 3DN C/SiC were analyzed. The results showed that 3DN C/SiC could achieve a permeability of 3.37 × 10^–12 m² under a porosity of 47.61 %, which was close to that of commonly used metal porous media. 3DN C/SiC also demonstrated good flow characteristics as a porous medium. Considering its other advantages, such as high temperature resistance, light weight, and high specific strength, 3DN C/SiC has excellent potential and prospects in jet-engine thermal protection systems.

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来源期刊

International Journal of Heat and Fluid Flow 工程技术-工程：机械

CiteScore

5.00

自引率

7.70%

发文量

131

审稿时长

33 days

期刊介绍： The International Journal of Heat and Fluid Flow welcomes high-quality original contributions on experimental, computational, and physical aspects of convective heat transfer and fluid dynamics relevant to engineering or the environment, including multiphase and microscale flows. Papers reporting the application of these disciplines to design and development, with emphasis on new technological fields, are also welcomed. Some of these new fields include microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.