Cross-Scale Flow Field Analysis of Sealing Chamber and End Face Considering the CO2 Real Gas Effect

The dry gas seal (DGS) is a non-contacting, gas-lubricated mechanical face commonly used in rotating machinery. Traditional analyses of DGSs treat the end as an independent factor by setting end-face inlet boundary conditions, but limited attention focused on sealing chamber DGS. Using finite volume method and shear stress transport (SST) k-ω model, coupling between millimeter-scale micrometer-scale are simulated with regard to real effect CO2. three-dimensional distributions velocity, pressure temperature cross-scale flow field investigated under different working conditions. Moreover, parameters modified response surface methodology central composite rotatable design. results demonstrate that CO2 leads increased total flow. When reaches 10.3 MPa, relative difference 51.90% compared ideal gas. Minor changes occur when operation. However, Tf increases pf decreases. These research provide reliable reference for engineering practice.