| Citation: | HUANG Chanyuan, WEN Shuaifang, SUN Dan, et al. Numerical and experimental study on leakage characteristics of combined elastic metal seal[J]. Journal of Aerospace Power, 2025, 40（5）：20230484 doi: 10.13224/j.cnki.jasp.20230484
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In order to study the leakage characteristics of the combined elastic metal seal, two kinds of numerical calculation models for the leakage characteristics of the contact leakage channel and the gap leakage channel were established. On basis of the numerical calculation results of the macroscopic mechanical characteristics, a solution model for the leakage characteristics of the combined elastic metal seal considering the actual rough contact surface was established based on the fractal theory. An experimental device for leakage characteristics of the combined elastic metal seal was designed and built. Based on experimental verification of the accuracy of the numerical solution model, the mechanical characteristics and leakage characteristics of the combined elastic metal seal under different pressure difference and compression amount of the internal and external cavities were studied, and the sealing mechanism under the influence of roughness was analyzed. The results showed that the equivalent stress increased with the increase of pressure difference and compression quantity. The leakage decreased gradually with the increase of compression and temperature, and the leakage decreased by 24.12% under the conditions of maximum pressure ratio and maximum compression. Surface roughness had a great influence on the leakage amount of the combined elastic metal seal, and roughness and compression could affect the leakage channel gap at the contact and then affect the flow field distribution. The numerical calculation method considering roughness had less error than the traditional method, and can calculate the leakage amount of the combined elastic metal seal more accurately, providing a theoretical basis for analysis of leakage characteristics of the combined elastic metal seal.
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