Targeting the problem of estimating the leakage rate in the design of metal seal ring

a method to predict the leakage rate based on numerical calculation was proposed. This method combined the macro-structure of the sealing system and micro-surface contact deformation considerations. The overall structure of the seal was calculated firstly

and its calculated values (contact stress

contact area) were taken as the input parameters. The rough microscopic surface with the surface roughness as the evaluation index was established. Using finite element method (FEM) for contact calculation

the leak channel model was established. After the fluid properties in the leakage gap were determined

the leakage rate was calculated by computational fluid dynamics (CFD) method. Leakage rate test was performed using a sealed test bench and the calculated values were compared with the test results. The result shows that as the contact stress increases

the surface roughness decreases

and the pressure difference increases

the leakage rate of the seal system gradually decreases. With this proposed method

the aquisition of leakage rate value relies little on the test equipment

helping to predict the leakage rate of metal seal structure effectively

while playing an important role in the design and evaluation of advanced metal seal rings.