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Based upon C.H. Wu's equations of motion for the two kinds of stream surface, each solver is developed using finite element methods. In H-S stream surface the capability to deal with effects of non-axisymmetric case is included. Especially, in B-B stream surface a unique equation of motion is obtained by adopting a new coordinate system (m,θ) under the assumption that B-B stream surface is a stream surface of revolution, and it provides the ability to be applied to any type of trubomachinery. Also, Kutta condition is exactly assured by introducing a combination of two kinds of stream functions, which make it possible to predict the direction of exit flow, Mizuki's experimental results on the centrifugal impellers are tested numerically, and the reliability of the numerical solution is guaranteed.
In this paper, the pressure distributions and the load capacities of the doubly-stepped gas journal bearing are studied by an incremental finite element method. The lubricant is considered as steady-state isothermal fluid. The pressure distributions obtained when Λ is 3, are compared with finite difference solutions. The results show that they are almost coincided with the finite difference solutions. For the doubly stepped gas journal bearing, k=1.5, the increase of the load capacity is occurred within the eccentricity ratio ε=0.6. And the more Λ grows large, the more the increase of the load capacity grows large for the same value of ε.
In order to improve the load capacity of externally pressurized air-lubeicatedjournal bearings, a new type(doubly-stepped type) bearing was revised and experimented. Through the results of experiment, the load capacity of doubly-stepped bearings was discussed and compared with equivalent conventional circular journal bearings. Results were obtained for speed up to 18000rpm and for supply pressure ratio(Ps/Pa) 4.8,6,7. Compared with equivalent conventional bearings, doubly-stepped bearings resultd a high gain in load capacity. It is also shown that the increasing rate of load capacith increases with decreasing the eccentricity ratio. Furthermore, the increasing rate is higher in the case of great clearanceratio than small dleatance ratio of doubly-stepped bearings. Such an increase in load capacity is confirmed by pressure distributions in the bearings.