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9th International Conference on Compressors and their Systems IOP Publishing IOP Conf. Series: Materials Science and Engineering 90 (2015) 012062 doi:10.1088/1757-899X/90/1/012062 Figure 6. Streamlines in CFD analysis of shaft seal geometry. 4.3 Thrust Load Control Maintenance of thrust loads during running within the capabilities of the gas thrust bearing was initially addressed by the minimization of impeller diameter. A further parameter which influences thrust load is the effective diameter of the shaft seal. Though a large diameter shaft seal will reduce thrust loads when running at the design point, it will increase static thrust load when starting. Figure 7. Graph of thrust bearing load under different operating conditions To maintain thrust loads within the capacity of the thrust bearing during machine starting, it was necessary to use the smallest diameter seal that could be fitted to the shaft. It was also necessary to balance thrust loads by the use of a seal on the impeller back and partial venting of the impeller back- plate region. Extensive modelling of this passive thrust control system was necessary to ensure that the loads generated were sufficiently low through the entire operational envelope with adequate margin of safety. Figure 7 shows the resultant thrust loads under various operating conditions. 8PDF Image | IOP Science The Development of a Small High Speed Steam Microturbine Generator System
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