ISSN Online: 2377-424X
ISBN Print: 0-85295-345-3
International Heat Transfer Conference 10
FLOW AND HEAT TRANSFER IN ROTATING CAVITIES WITH AXIAL THROUGHFLOW
Abstrakt
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.