The role of particulate contaminants in advanced gas turbine coolants is discussed, especially in light of the extremely high G-field regions they will experience in service. Predictions of sedimentation in both laminar and highly turbulent accelerating flows using a computational fluid dynamics code are made for a range of particulate sizes to show that particles over 0.5 µm are of concern. Possible techniques for limiting access of these particulates to the gas turbines themselves are presented. Overall, contaminant deposition appears controllable, limiting required cleaning of coolant channels to regularly scheduled inspections.
Volume Subject Area:
Electric Power
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