BEM/FDM conjugate heat transfer analysis of a two-dimensional air-cooled turbine blade boundary layer |
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Authors: | Zhenfeng Wang Peigang Yan Zhaoyuan Guo Wanjin Han |
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Affiliation: | (1) School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China |
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Abstract: | A coupled boundary element method (BEM) and finite difference method (FDM) are applied to solve conjugate heat transfer problem
of a two-dimensional air-cooled turbine blade boundary layer. A loosely coupled strategy is adopted, in which each set of
field equations is solved to provide boundary conditions for the other. The Navier-Stokes equations are solved by HIT-NS code.
In this code, the FDM is adopted and is used to resolve the convective heat transfer in the fluid region. The BEM code is
used to resolve the conduction heat transfer in the solid region. An iterated convergence criterion is the continuity of temperature
and heat flux at the fluid-solid interface. The numerical results from the BEM adopted in this paper are in good agreement
with the results of analytical solution and the results of commercial code, such as Fluent 6.2. The BEM avoids the complicated
mesh needed in other computation method and saves the computation time. The results prove that the BEM adopted in this paper
can give the same precision in numerical results with less boundary points. Comparing the conjugate results with the numerical
results of an adiabatic wall flow solution, it reveals a significant difference in the distribution of metal temperatures.
The results from conjugate heat transfer analysis are more accurate and they are closer to realistic thermal environment of
turbines. |
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Keywords: | Conjugate heat transfer Boundary elements Finite difference Air-cooled gas turbine |
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