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Numerical Analysis of a Spiral-groove dry-gas seal Considering Micro-scale Effects

Chinese Journal of Mechanical Engineering 2011年第1期24卷 146-153页

作者： WANG Bing ZHANG Huiqiang School of Aerospace Tsinghua University Beijing 100064 China Beijing 3E Enemy Key Laboratory Tsinghua University Beijing 100084 China

A dry-gas seal system is a non-contact seal technology that is widely used in different industrial ***-groove dry-gas seal utilizes fluid dynamic pressure effects to realize the seal and lubrication processes,while forming a high pressure gas film between two sealing faces due to the deceleration of the gas pumped in or *** is little research into the effects and the influence on seal performance,if the grooves and the gas film are at the *** paper investigates the micro-scale effects on spiral-groove dry-gas seal performance in a numerical solution of a corrected Reynolds *** Reynolds equation is discretized by means of the finite difference method with the second order scheme and solved by the successive-over-relaxation（SOR） iterative *** Knudsen number of the flow in the sealing gas film is changed from 0.005 to 0.120 with a variation of film depth and sealing *** numerical results show that the average pressure in the gas film and the sealed gas leakage increase due to micro-scale *** open force is enlarged,while the gas film stiffness is significantly decreased due to micro-scale *** friction torque and power consumption remain constant,even in low sealing pressure and spin speed *** this paper,the seal performance at different rotor face spin speeds is also *** proposed research clarifies the micro-scale effects in a spiral-groove dry-gas seal and their influence on seal performance,which is expected to be useful for the improvement of the design of dry-gas seal systems operating in the slip flow regime.

关键词： micro-scale effect spiral-groove dry-gas seal numerical analysis Reynolds equation

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