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Table 1 Specifications for cluster spiral groove seal face

From: Leakage and Stiffness Characteristics of Bionic Cluster Spiral Groove Dry Gas Seal

Item Value
Outside radius ro (mm) 36.5
Inside radius ri (mm) 29.5
Balance radius rb (mm) 32.5
Groove number Ng 12
Spiral angle β (°) 15
Groove-dam ratio αg 1.5
Groove-land ratio δ 1.0