Journal of Shenyang Aerospace University >
Influence of rotation on flow and heat transfer characteristics of constricted and expanded serpentine channels
Received date: 2023-11-24
Online published: 2024-08-30
In order to explore the changes in the flow and heat transfer characteristics of the internal cold channel in turbine blades,the effects of rotation numbers 0,0.03,0.06,0.09 and 0.3 on the flow resistance and heat transfer capacity of constricted and expanded serpentine channels with inlet Reynolds number Re=3×104 were investigated.The results show that the Coriolis force and centrifugal force together push the fluid in the center of the channel to the pressure surface,and then the upper wall of the channel is returned to form a vortex with the central fluid,thereby changing the flow structure in the channel.With the increase of the rotation number,the channel resistance coefficient shows a trend of first increasing and then decreasing.When the rotation number rises from 0 to 0.3,the channel resistance coefficient decreases by 53.79%.Rotation destroys the boundary layers of the suction surface and the pressure surface by strengthening the fluid disturbance to enhance the overall heat transfer capacity of the channel.When the rotation number increases from 0 to 0.3,the local heat transfer capacity of the first and second processes increases significantly higher than that of other processes,and increases by 68.49% compared with the relative stationary channel.The overall heat transfer capacity of the constricted and expanded serpentine channel is increased by 21.18% compared with the stationary state.
Key words: turbine blade; internal cold channel; Coriolis force; rotation; serpentine channel
Honglei ZHANG , Guangchao LI . Influence of rotation on flow and heat transfer characteristics of constricted and expanded serpentine channels[J]. Journal of Shenyang Aerospace University, 2024 , 41(3) : 30 -36 . DOI: 10.3969/j.issn.2095-1248.2024.03.005
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