Non-contact dry gas seals are widely used for very high rotating and high pressure machinery. Non-contact dry gas seals are constantly being required to reduce gas emission from machine. On the other hand, in the design of non-contact dry gas seals, it is cardinal importance to enhance the stiffness of gas seal for minimizing the vibration due to external excitation. However, stiffness and gas leakage quantity are in the relationship of trade-off. Moreover, those characteristics of dry-gas seals depend on groove dimension and geometry. The spiral groove geometry is widely used dry-gas seal in general. However, it is not verified that spiral groove is optimal geometry in the all cases. Therefore in this study, we have applied to multi-objective optimum design to improve on sealing characteristics and stiffness.
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