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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Bohn, D. Deuker, E. Emunds, R. Gorzelitz, V. |
| Copyright Year | 1993 |
| Abstract | The prediction of the temperature distribution in a gas turbine rotor containing closed, gas-filled cavities, for example in between two discs, has to account for the heat transfer conditions encountered inside these cavities. In an entirely closed annulus forced convection is not present, but a strong natural convection flow exists, induced by a non-uniform density distribution in the centrifugal force field. Experimental investigations have been made to analyze the convective heat transfer in closed, gas-filled annuli rotating around their horizontal axis. The experimental set-up is designed to establish a pure centripedal heat flux inside these annular cavities (hot outer, and cold inner cylindrical wall, thermally insulated side walls). The experimental investigations have been carried out for several geometries varying the Rayleigh number in a range usually encountered in cavities of turbine rotors (1007 < Ra < 1012). The convective heat flux induced for Ra = 1012 was found to be a hundred times larger compared to the only conductive heat flux. By inserting radial walls the annulus is divided into 45° sections and the heat transfer increases considerably. A computer programme to simulate flow and heat transfer in closed rotating cavities has been developed and tested successfully for annuli with isotherm side walls with different temperatures giving an axial heat flux. For the centripedal heat flux configuration, three-dimensional steady state calculations of the sectored annulus were found to be consistent with the experimental results. Nevertheless, analysis of unsteady calculations show that the flow can become unstable. This is analogous to the Bénard problem in the gravitational field. |
| Sponsorship | International Gas Turbine Institute |
| File Format | |
| ISBN | 9780791878910 |
| DOI | 10.1115/93-GT-292 |
| Volume Number | Volume 3B: General |
| Conference Proceedings | ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition |
| Language | English |
| Publisher Date | 1993-05-24 |
| Publisher Place | Cincinnati, Ohio, USA |
| Access Restriction | Open |
| Subject Keyword | Computers Temperature distribution Forced convection Temperature Rotors Natural convection Rayleigh number Flow (dynamics) Density Steady state Heat flux Convection Cavities Gas turbines Annulus Centrifugal force Disks Heat transfer Turbines |
| Content Type | Text |
| Resource Type | Article |
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