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首页> 外文期刊>International Journal of Heat and Mass Transfer >Transpiration cooling for additive manufactured porous plates with partition walls
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Transpiration cooling for additive manufactured porous plates with partition walls

机译：增材制造的带隔板的多孔板的蒸腾冷却

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Transpiration cooling is an effective method to protect high heat flux surfaces such as rocket combustion chambers. However, this technology is currently not applicable for turbine airfoils as the strength of traditional sintered porous material was too low and the pore structure was uncontrollable. Consequently, developing porous media with high mechanical strength and precise geometry is important for transpiration cooling. Present study utilized the Selective Laser Melting Additive manufacturing technology to fabricate metal porous plates for transpiration cooling. Reinforcing partition walls were applied to the porous plate to further enhance the mechanical strength. Both cooling efficiency and mechanical properties were evaluated for the additive manufactured porous plates and compared to the traditionally sintered porous plate. The experimental results showed that the transpiration cooling efficiencies of the additive manufactured porous plates with partition walls approached to that of sintered porous plate, which approached to 0.7 when coolant blowing ratio was 2%. The presence of solid partition walls did not affect the cooling efficiency even for a high blocking ratio of 60%. The mechanical property was significantly improved by additive manufactured porous plate with partition walls. The ultimate tensile strength CUTS) increased by 440% compared to sintered porous material. Such results demonstrated that additive manufacturing and reinforced partition walls might be potential solutions to enhance the mechanical strength of transpiration cooling. (C) 2018 Elsevier Ltd. All rights reserved.
机译：蒸腾冷却是保护高热通量表面（例如火箭燃烧室）的有效方法。然而，由于传统的烧结多孔材料的强度太低并且孔结构不可控，因此该技术目前不适用于涡轮机翼型。因此，开发具有高机械强度和精确几何形状的多孔介质对于蒸腾冷却非常重要。目前的研究利用选择性激光熔融添加剂制造技术来制造用于蒸发冷却的金属多孔板。将增强的分隔壁施加到多孔板上以进一步增强机械强度。评价了添加剂制造的多孔板的冷却效率和机械性能，并与传统的烧结多孔板进行了比较。实验结果表明，添加剂制造的带隔壁的多孔板的蒸发冷却效率接近烧结多孔板的蒸发冷却效率，当冷却剂吹入率为2％时，其蒸发冷却效率接近0.7。即使存在60％的高阻塞率，固体分隔壁的存在也不会影响冷却效率。通过增材制造的带有隔壁的多孔板可以显着改善机械性能。与烧结多孔材料相比，极限抗拉强度（CUTS）增加了440％。这些结果表明，增材制造和加强隔墙可能是增强蒸腾冷却机械强度的潜在解决方案。 （C）2018 Elsevier Ltd.保留所有权利。

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