Session: 14-07 Modelling Methods for IAS

Paper Number: 123812

123812 - Numerical Investigation for a Rotating Cavity With Axial Throughflow With Both Axial Heating and Radial Heating 

This article investigates the flow and heat transfer characteristics of a compressor buoyancy-driven rotating cavity with axial throughflow of cooling air under a two-dimensional thermal boundary of both axial and radial heating. Unlike previous studies that mainly focused on radial heating, the axial temperature difference cannot be ignored with the increase of the single stage compression ratio of the compressor. We perform validated large-eddy simulations by solving the compressible Navier–Stokes equations. Wall heat transfer predictions are compared with measured data with a good level of agreement. The numerical simulation analyzed the effect of axial heating on the flow and heat transfer in the rotating cavity under three different axial heating intensities and three different Rossby Number. In each case, the differences between two-dimensional thermal boundary, small temperature difference radial heating, middle difference radial heating, and large temperature difference radial heating were compared. The disk Nusselt number is compared with Ekman thermal conductivity. The results indicate that the two-dimensional thermal boundary changes the buoyancy force and temperature distribution in the cavity, resulting in different maximum and average Nu on the disk surface compared to the case of only radial heating. The contribution of each velocity component to the heat transfer on the disk surface was analyzed using the field synergy principle. The Nu of the shroud is compared with that of natural convection under gravity for high Rayleigh numbers and also different from the case of only radial heating. A separate analysis is conducted on the corner areas of the disk and shroud. In addition, the analysis also indicates that the radiation effect is more significant in the disk cavity under the two-dimensional thermal boundary than in the case of radial heating only. In the conjugate heat transfer disk cavity, it will change the flow field, so that it needs to be considered in the design process.

Presenting Author: Yu Zhao Research Institute of Aero-Engine , Beihang University

Presenting Author Biography: Yu Zhao, received the B.Sc. degree in Aircraft Power Engineering from the Northwestern Polytechnical University, Shaanxi, China, in 2015. He is pursuing a doctoral degree at Beihang University. His research interests in the flow and heat transfer in the secondary air system of Aero-engine.

Authors:

Yu Zhao Research Institute of Aero-Engine , Beihang University
Shuiting Ding Research Institute of Aero-Engine , Beihang University
Tian Qiu Research Institute of Aero-Engine , Beihang University
Yang Xu School of Energy and Power and Engineering
Peng Liu Research Institute of Aero-Engine , Beihang University