Open AccessNumerical study of turbulent mixed convection in a rotating inter-disk cavity with axial throughflow of cooling air
Author(s) -
С. И. Смирнов,
А. Г. Абрамов,
E. É. Kitanina,
Е. М. Смирнов
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1809/1/012013
Subject(s) - throughflow , reynolds averaged navier–stokes equations , mechanics , turbulence , nusselt number , laminar flow , large eddy simulation , physics , reynolds number , classical mechanics
The paper presents the results of eddy-resolving numerical simulation of mixed convection developing in a rapidly rotating inter-disk cavity with axial throughflow of cooling air. Under conditions of the experiments available in the literature for the case of the cavity heating from the side of the disk surfaces, the computations were performed using two methods: Implicit LES and zonal RANS/ILES, with and without taking into account the gravity effects. In case of the zonal RANS/ILES approach, the axial pipe flow and the zone of turbulent mixing of throughflow with particles of heated gas were simulated on the base of the RANS equations added by a turbulence model, whereas the major part of the buoyancy-controlled cavity flow was computed with the ILES method. The ratio of the cavity width to its outer radius was 0.13. The computations were carried out at the rotational Reynolds number equal to 2·10 5 , if evaluated with the outer radius; the axial flow Reynolds number was 2·10 4 . A moderate size grid used in the computations (of about 5·10 5 cells) provided a good resolution of quasi-laminar Ekman layers. Data on dynamics of unsteady vortex structures forming in the cavity, on characteristics of local heat transfer, as well as on effects of the gravity force action are reported. The results of computations of the time-averaged local Nusselt number on the disks surfaces are compared with measurement data; an acceptable agreement has been obtained in case of the zonal RANS/ILES approach.