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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

FLOW AND HEAT TRANSFER IN ROTATING CAVITIES WITH AXIAL THROUGHFLOW

Get access (open in a dialog) DOI: 10.1615/IHTC10.2860
pages 253-259

Résumé

In this paper, a rotating cavity with an axial throughflow of air is used as a model for the flow between two adjacent compressor discs. Both experimental and numerical results are presented. Experiments being carried out on a rig comprising two plane discs of outer radius, b = 0.485m and a peripheral shroud of axial width s = 0.065m or 0.174m. An axial throughflow of cooling air of bulk average velocity, W, entered the cavity through a hole of radius a = 0.044m in one disc and left the cavity through an identical hole in the other. Heat transfer measurements were obtained from thermopile fluxmeters on the disc for the range of respective rotational and axial Reynolds numbers: 2 × 105 ≤ Reφ ≤ 5 × 106; 2 × 104 ≤ Rez ≤ 16 × 104 (Reφ = Ωb2/ν and Rez = 2Wa/ν; Ω being the rotational speed of the cavity). The influence of these parameters and also cavity gap ratio (s/b) on the heat transfer from the discs is discussed. Numerical results were obtained using a 3D, time-dependent CFD code and mixing length model. Where possible, comparisons are made between numerical results and experiment.