NDLI: Novel 2D Transient Heat Conduction Calculation in a Cooled Rotor: Ventilation Preheating

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Solano, J. P. Paniagua, G. Loma, A. De La
Copyright Year	2008
Abstract	An alternative to classical data reduction techniques for thin film gauges in short duration facilities is presented. A finite element model of the two-dimensional unsteady heat conduction equation is solved in the cross-sectional area of a metallic airfoil bounded with a polyamide sheet, on which thermal sensors are deposited. As a result, the transient temperature field in the multilayered substrate and the experimental wall heat flux distribution are derived. The methodology allows for capuring all 2D heat conduction effects that are irremediably neglected with the 1D data reduction technique. The application of this technique in a compression tube facility allows an exact evaluation of the initial wall heat flux into cooled rotor blades. During the spinning up period, the rotor of this type of fully rotating transient facilities is spun up to nearly its nominal speed (from 0 RPM to 6200 RPM) resulting in preheating due to drag losses. The long duration of this experiment (∼450 s) and the magnitude of the wall temperature increase result in significant 2D conduction effects that are not accounted for using the 1D approach. In addition, short duration experiments confirm the existence of 2D effects at smaller time scales (∼0.5 s), as well as the influence of the initial non-uniform temperature distribution in the rotor blade. The resulting flux with such an initial condition appears to be the superposition of the wall heat flux at the end of the spinning up before the test and the flux due to the blow-down itself.
Sponsorship	International Gas Turbine Institute
Starting Page	1105
Ending Page	1115
Page Count	11
File Format	PDF
ISBN	9780791843147
DOI	10.1115/GT2008-51308
e-ISBN	0791838242
Volume Number	Volume 4: Heat Transfer, Parts A and B
Conference Proceedings	ASME Turbo Expo 2008: Power for Land, Sea, and Air
Language	English
Publisher Date	2008-06-09
Publisher Place	Berlin, Germany
Access Restriction	Subscribed
Subject Keyword	Spinning (textile) Temperature distribution Compression Temperature Blades Rotors Airfoils Transient heat transfer Drag (fluid dynamics) Gages Heat flux Transients (dynamics) Heat conduction Thin films Wall temperature Spin (aerodynamics) Finite element model Ventilation Sensors
Content Type	Text
Resource Type	Article

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