ACTA AERONAUTICAET ASTRONAUTICA SINICA >
DDES analysis of unsteady characteristics of interaction between tip leakage flow and wake
Received date: 2022-11-29
Revised date: 2022-12-20
Accepted date: 2023-02-06
Online published: 2023-02-20
Supported by
National Major Science and Technology Project(J2019-II-0008-0028);National Natural Science Foundation of China(52276031)
Tip leakage flow containing multiple spatial and temporal scale flow field structures is one of the major sources of aerodynamic losses and unsteadiness in turbine. This study employs Delayed Detached Eddy Simulation （DDES） to simulate the tip leakage flow in a high-pressure turbine rotor. The structure and unsteady characteristics， as well as the unsteady interaction between the tip leakage flow and the wake are analyzed. Based on the unsteady entropy transport equation， the loss mechanism of the leakage flow zone is decomposed and studied. It is found that the DDES method can finely capture the multiscale flow field structure and mutual interference of the leakage flow and wake. The result shows that the interference between the leakage flow and the wake vortex can lead to a significant shift of the wake vortex trajectory， accompanied by the generation of vortex fragmentation with a strong unsteady effect. Based on the unsteady entropy transport equation， the loss caused by vortex fragmentation can account for 23.3% of the pulsation loss， becoming an important source of loss.
Key words： tip leakage flow; wake; unsteady interference; DDES; entropy generation
Hui LI , Tong HUANG , Xinrong SU , Xin YUAN . DDES analysis of unsteady characteristics of interaction between tip leakage flow and wake[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(14) : 628325 -628325 . DOI: 10.7527/S1000-6893.2022.28325
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