Abstract
In this study, Kagome lattice structure (KLS) produced by 3D printer is used as a turbulator for a typical rectangular internal cooling channel at the trailing edge of turbine blade. The friction factor and bottom wall heat transfer coefficient of the channel filled with low thermal conductivity ABS plastic KLS are experimentally and numerically analyzed by changing the column diameter d/H = 0.1–0.2, the inclination angle α = 45°-60° and included angle β = 120°-150° under the Reynolds number range of 5000–30,000. The fitting correlations of these parameters with the channel friction factors and the average Nusselt number of working surface are obtained. The results show that when Reynolds number increases from 5000 to 30,000, the vortex range behind type II column increases obviously, the local heat transfer effect is obviously improved and the comprehensive impact factor F increases by 180%. When d/H increases from 0.1 to 0.2, the area of stagnation vortex after type I column expands, the heat transfer effect improves significantly, the friction factor increases by 60.9%, the average Nusselt number of channel wall increases by 32.2%, and the F increases by 16%. With the increase of α and β, the heat transfer effect has no obvious change, but the friction factor in the channel is reduced with different degrees. The high heat transfer area is mainly concentrated near the surface of the column. In the obtained fitting correlation, the maximum error of the average Nusselt number is 9.3%, and the maximum error of friction factor is 24%.
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Abbreviations
- A:
-
Heating area, m2
- F:
-
Comprehensive impact factor
- H:
-
Channel height, m
- L1 :
-
Length of stable section, m
- L2 :
-
Internal cooling channel length, m
- Nu:
-
Local Nusselt number
- Nuave :
-
Average Nusselt number
- Pout :
-
Outlet pressure, Pa
- Q:
-
Inlet flow, m3·s-1
- Re:
-
Reynolds number
- Sx :
-
Spacing of lattice truss in X-direction, m
- Sy :
-
Spacing of lattice truss in Y-direction, m
- Tair :
-
Local bulk fluid temperature of air, K
- Tin :
-
Inlet air temperature, K
- Ts :
-
Local wall temperature, K
- Tw :
-
Average wall temperature in channel, K
- V:
-
Inlet velocity, m·s-1
- W:
-
Width of inner cooling channel, m
- d:
-
Column diameter, m
- f:
-
Friction factor
- k:
-
Thermal conductivity of air, W·m-1·K-1
- q:
-
Wall heat flux, W·m-2
- Δp:
-
Pressure difference between two ends of test section, Pa
- α:
-
Inclination angle of column, °
- β:
-
Included angle of column, °
- μ:
-
Dynamic viscosity, Pa·s
- ν:
-
Air specific volume, m3·kg-1
- ρ:
-
Air density, kg·m-3
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No.51876157) and Shaanxi Natural Science Foundation (No.2019JM-096).
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Xu, L., Chen, H., Xi, L. et al. Flow and heat transfer characteristics of a staggered array of Kagome lattice structures in rectangular channels. Heat Mass Transfer 58, 41–64 (2022). https://doi.org/10.1007/s00231-021-03100-2
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DOI: https://doi.org/10.1007/s00231-021-03100-2