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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

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Showing 1 to 2 of 2 (0.019 seconds)
1

Effects of Rotation on the Flow Structure in a Compressor Cascade

Ventosa-Molina, Jordi, Koppe, Björn, Lange, Martin, Mailach, Ronald, Fröhlich, Jochen 08 May 2023 (has links)
In turbomachines, rotors and stators differ by the rotation of the former. Hence, half of each stage is directly influenced by rotation effects. The influence of rotation on the flow structure and its impact on the performance is studied through wall-resolving large Eddy simulations of a rotor with large relative tip gap size. The simulations are performed in a rotating frame with rotation accounted for through a Coriolis force term. In a first step, experimental results are used to provide validation. The main part of the study is the comparison of the results from two simulations, one representing the rotating configuration and one with the Coriolis force removed, without any other change. This setup allows a very clean assessment of the influence of rotation. The turbulence-resolving approach ensures that the turbulent flow features are well represented. The results show a significant impact of rotation on the secondary flow. In the tip region, the tip leakage vortex is enlarged and destabilized. Inside the tip gap, the flow is altered as well, with uniformization in the rotating case. At the blade midspan, no significant effects are observed on the suction side, while an earlier transition to turbulence is found on the pressure side. Near the hub, rotation effects are shown to reduce the corner separation significantly.
info:eu-repo/classification/ddc/620
ddc:620
info:eu-repo/classification/ddc/600
ddc:600
2

Three-dimensional Effects on Unsteady Dynamics and Turbulent Transport Mechanisms of an Impinging Shock Wave/Boundary-layer Interaction

Vyas, Manan A. January 2021 (has links)
No description available.
Aerospace Engineering
Fluid Dynamics
shock wave
boundary layer
interaction
SBLI
Reynolds stress
transport
budget
mechanism
wall resolved
large eddy simulation
LES
WRLES
low frequency
unsteadiness
separation
correlation
corner budget
secondary flow
vortex pair

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