Prediction of Axial and Circumferential Flow Conditions in a High Temperature Foil Bearing With Axial Cooling Flow
- Authors
- Ryu, Keun
- Issue Date
- Sep-2012
- Publisher
- ASME
- Keywords
- Bulk flow model; Test data; Turbulent flow; Hot spot; Flow condition; Thin films; Fluid motions; Pressurized air; Flow rate; Cooling; Rotors; Cooling flows; High temperature foil; Friction factors; System reliability; Foil bearings; Laminar flow; Gas foil
- Citation
- JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME, v.134, no.9, pp.1 - 6
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
- Volume
- 134
- Number
- 9
- Start Page
- 1
- End Page
- 6
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/32157
- DOI
- 10.1115/1.4006841
- ISSN
- 0742-4795
- Abstract
- A successful implementation of gas foil bearings (GFBs) into high temperature turbomachinery requires adequate thermal management to maintain system reliability and stability. The most common approach for thermal management in a GFB-rotor system is to supply pressurized air at one end of the bearing to remove hot spots in the bearings and control thermal growth of components. This technical brief presents test data for a laboratory rotor-GFB system operating hot to identify the flow characteristics of axial cooling streams flowing through the thin film region and underneath the top foil. A bulk flow model is used for description of the fluid motion and includes the Hirs' friction factor formulation for smooth surfaces. Laminar flow prevails through the thin film gas region; while for the cooling flow between the top foil and bearing housing, a transition from laminar flow to turbulent flow occurs as the cooling flow rate increases. Large cooling flow rate and the ensuing turbulent flow conditions render limited effectiveness in controlling temperatures in a test rotor-GFB system. [DOI:10.1115/1.4006841]
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