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Title: An experimental study of heat transfer in the cooling channels of gas turbine rotor blades
Author: Khamaj, J. A. J.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2001
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This thesis presents an investigation of experimental research into the effect of rotation on the convective heat transfer mechanism inside the cooling channels of turbine rotor blades. These involved the selection of eleven different channel geometries and these have been designated alphabetically by the letters 'A' through 'K' respectively. These channels involve a collection of basic geometrical duct cross sectional shapes with the incorporation of ribbed surfaces. The leading and trailing edges of the duct are fitted with in-line or staggered ribs aligned at 30° to 45° to the central axis of the duct. The leading and trailing edges are heated using electrical foil heaters bonded underneath copper plates on which a particular rib configuration was machined. The other two sides of the test sections would be deemed adiabatic. The centre lines of the heated leading and trailing edges were fitted with thirteen foil thermocouples. The coolant used was air with the flow direction in the radially outward direction. Test section A was square in cross section with 'in-line' ribs fitted to the leading and trailing edges. The ribs were inclined at 45° to the direction of coolant flow, which was radially outward. Test sections 'B', 'C' and 'D', were used to examine experimentally the effect of the aspect ratio of rectangular-sectioned ducts cross sections. The respective aspect ratios of test channels 'B', 'C' and 'D' were 0.5, 1.0 and 2.0. Each channel was fitted with staggered ribs inclined at 45° to the direction of flow. Test section 'D' was used to examine the effect of a rectangular channel having an angular inclination relative to the plane of rotation. In other words the heated leading and trailing edges of the channel were skewed to simulate the fact that, in a cambered rotor blade, these edges were inclined to the plane of rotation. Relative to the case of in line rotation, test sections 'E' and 'F' were inclined at 30° and 60° (clock wise) to the plane of rotation. Similarly test sections 'G' and 'H' had inclinations of -30° and -60° respectively.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available