Multi-parameters analysis on static bearing load and aerodynamic heat of hydrodynamic gas bearing with axial throughflow cooling
Three-dimensional fluid-solid coupled numerical simulations were performed for the hydrodynamic gas bearing with an axial throughflow cooling under a stable operating condition,so as to illustrate the multi-parameter effects on the static bearing load and aerodynamic heat.The results showed that the circumferential flow driven by the strong shearing of rotor was dominant in the film-layer gap.The axial throughflow was forced to follow the circumferential flow at its inlet section.Then it moved axially toward the outlet mainly from the larger-thickness film-layer zone,making the three-dimensional flow take on an obvious spiral flow feature.Among the concerned parameters,the eccentricity was identified to be the most important parameter affecting the static bearing load and aerodynamic heat.The film-layer mean gap had a stronger influence than the axial throughflow mass-rate on the static bearing load,but the situation was opposite for the aerodynamic heat.When the static bearing load was kept nearly the same,it was found that the aerodynamic heat effect was weaker in the situation when the hydrodynamic gas bearing operated with a small eccentricity and also a small film-layer man gap.For the situation when the hydrodynamic gas bearing operated with a big eccentricity and also a big film-layer mean gap,the aerodynamic heat effect was stronger,bringing about a more crucial requirement of heat dissipation.
hydrodynamic gas bearingaerodynamic performancethermal performanceaxial throughflowmulti-parameter influence
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