Synergistic effect of Coriolis and centrifugal forces from poloidal flow on internal kink and fishbone modes in tokamak plasmas

2020 ◽  
Vol 27 (9) ◽  
pp. 092504
Author(s):  
Weichao Xie
Keyword(s):  
Synergistic Effect ◽  
Tokamak Plasmas ◽  
Centrifugal Forces ◽  
Coriolis And Centrifugal Forces

scholarly journals Existence and linear stability of triangular points in the perturbed relativistic R3BP when the bigger primary is an oblate spheroid

2016 ◽  
Vol 4 (1) ◽  
pp. 49
Author(s):  
Bello Nakone ◽  
Jagadish Singh
Keyword(s):  
Linear Stability ◽  
Centrifugal Force ◽  
Critical Mass ◽  
Oblate Spheroid ◽  
Centrifugal Forces ◽  
Mass Ratio ◽  
Small Perturbations ◽  
Coriolis Forces ◽  
Triangular Points ◽  
Coriolis And Centrifugal Forces

We study the effects of oblateness and small perturbations in the Coriolis and centrifugal forces on the locations and stability of the triangular points in the relativistic R3BP. It is observed that the positions are affected by the oblateness, relativistic, and a small perturbation in the centrifugal force, but are unaffected by that of Coriolis force. It is also seen that the relativistic terms, oblateness, small perturbations in the centrifugal and Coriolis forces influence the critical mass ratio. It is also noticed that all the former three and the latter one possess destabilizing and stabilizing behavior respectively. However, the range of stability increases or decreases according to as p >0 or p<0 where p depends upon the relativistic, oblateness and small perturbations in the Coriolis and centrifugal forces.

Effects of blade rotation on axial turbine tip leakage vortex breakdown and loss

2016 ◽  
Vol 231 (9) ◽  
pp. 1634-1649
Author(s):  
Jie Gao ◽  
Qun Zheng ◽  
Yunning Liu ◽  
Ping Dong
Keyword(s):  
Vortex Breakdown ◽  
Great Influence ◽  
Main Flow ◽  
Leakage Flow ◽  
Centrifugal Forces ◽  
Tip Leakage Vortex ◽  
Tip Leakage ◽  
Blade Rotation ◽  
Coriolis And Centrifugal Forces ◽  
Blade Tip

The tip leakage vortex breakdown occurs under a few conditions in modern turbines, which leads to extra vortex breakdown losses, but the mechanisms of vortex breakdown and its influencing factors still remain unclear. This paper is a continuation of the previous effort and focuses on the effect of blade rotation on the leakage vortex dynamics in an unshrouded turbine. The analyses on leakage vortex breakdown characteristics are first shown, and then the isolating effects of relative casing motion and Coriolis and centrifugal forces on leakage vortex breakdown and loss are investigated. Based on these, the overall effects of blade rotation on leakage vortex breakdown characteristics are examined. Results indicate that the scraping effects of the casing endwall have a great influence on the blade tip leakage vortex breakdown and loss. However, the effect of Coriolis and centrifugal forces is relatively small. Although the mismatch of both velocity components of the leakage flow and the main flow becomes slightly small with the casing motion, the blade tip mixing loss per unit leakage flow increases due to the fact that the leakage vortex breaks down in advance.

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