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Abstract: By the method of computational fluid dynamics, the
three-dimensional unsteady flow field in labyrinth gas seals is
predicted and the rotordynamic coefficients of the rotor are studied
with approximate analytical transformation and scheme of hybrid finite
analytical method. The reliability of the code is confirmed by comparing
with the results of experiment and two-control-volume model. This code
has the powers of studying the complex 3D unsteady flow field in
complicated gas seal with arbitrary whirl of rotor. The results also
show that the direct stiffness and the direct damping change small and
the cross-coupled stiffness changes large if inlet tangential velocity
changes large. Because the cross-coupled stiffness has the important
effect on the stability of rotor, this phenomenon is utilizable.
Key words: Labyrinth gas seals Rotor dynamic coefficients
Three-dimensional unsteady flow field
CLC No: TK26 TH113.1
国家自然科学基金(19990510)和国家重点基础研究发展规划(G19980
20319)资助项目. Received 20020206, received in revised form 20020728
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