Gas turbine blade trailing edge is easy to burn out under the exposure of
high-temperature gas due to its thin shape. The cooling of this area is an
important task in gas turbine blade design. The structure design and analysis
of trailing edge is critical because of the complexity of geometry,
arrangement of cooling channels, design requirement of strength, and the
working condition of high heat flux. In the present paper, a 3-D model of the
trailing edge cooling channel is constructed and both structures with and
without land are numerically investigated at different blowing ratio. The
distributions of film cooling effectiveness and convective heat transfer
coefficient on cutback and land surface are analyzed, respectively. According
to the results, it is obtained that the distributions of film cooling
effectiveness and convective heat transfer coefficient both show the
symmetrical characteristics as a result of the periodic structure of the
trailing edge. The increase of blowing ratio significantly improves the film
cooling effectiveness and convective heat transfer coefficient on the cutback
surface, which is beneficial to the cooling of trailing edge. It is also
found that the land structure is advantageous for enhancing the streamwise
film cooling effectiveness of the trailing edge surface while the film
cooling effectiveness on the land surface remains at a low level. Convective
heat transfer coefficient exhibits a strong dependency with the blowing
ratio, which suggests that film cooling effectiveness and convective heat
transfer coefficient must be both considered and analyzed in the design of
trailing edge cooling structure.