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指尖密封的泄漏与磨损一直是影响其工作性能和寿命的重要因素,且因两者性能改善途径的相互制约,使得指尖密封的优化设计举措难以两全,迄今尚无更好的技术解决这一难题。采用诸如碳/碳复合材料制备指尖密封零件,利用碳/碳复合材料具有的自润滑功能以更多地关注密封泄漏性能的改善,可能是改善上述研究现状的可行技术途径,而作为设计理论的基础,开展碳/碳复合材料指尖密封性能分析是很有意义的工作。论文利用细观组分材料的性能来计算2.5D碳/碳复合材料刚度矩阵,由此预测材料宏观弹性性能,建立2.5D碳/碳复合材料指尖密封动态性能分析的有限元模型,研究材料纱线密度和纱线编织结构对指尖密封动态性能的影响规律。研究结果表明:增大指尖密封圆周方向上的纱线密度、采用浅交直联纱线编织结构都可以显著提高指尖密封的密封性能,较之金属材料指尖密封,2.5D碳/碳复合材料指尖密封的动态性能表现出更好的品质。本文研究支持了碳/碳复合材料应用于指尖密封制备的可行性。
Leakage and wear of fingertip seals have always been an important factor affecting their performance and life span, and due to the mutual restriction of the improvement of their performance, the optimal design of fingertip seal is difficult to achieve by both ends. So far there is no better technical solution This problem. Using fingertip seals, such as carbon / carbon composites, to exploit the self-lubricating properties of carbon / carbon composites to focus more attention on improvements in seal leakage performance may be a viable technological way to improve the state of the art as described above, The basis of carbon / carbon composite fingertip seal performance analysis is a very meaningful work. In this paper, the stiffness matrix of 2.5D carbon / carbon composites was calculated by using the properties of mesoporous materials to predict the macroscopic elastic properties of the materials, and the finite element model of fingertip dynamic performance analysis of 2.5D carbon / carbon composites was established. Influence of Yarn Density and Yarn Braid Structure on Fingertip Seal Dynamic Performance. The results show that: increasing the yarn density in the circumferential direction of the fingertip seal can significantly improve the sealing performance of the fingertip seal by adopting the yarn cross-linked yarn structure. Compared with the fingertip seal of metal material, the 2.5D carbon / carbon composite The dynamic properties of the fingertip seal show better quality. This study supports the feasibility of carbon / carbon composites for fingertip sealing.