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A staggered array of Kagome truss cores with drop-shaped rods is proposed as a new turbulator for a typical rectangular internal cooling channel at the trailing edge of a turbine blade. Under the  Re  range of 5000–25000, flow field and heat transfer characteristics in the channel are comparatively analyzed for two Kagome truss cores with drop-shaped (DRKTC) and common cylindrical (CYKTC). The effect of rod diameter ( d  = 1–3 mm) and tail angle ( α  = 45°–90°) for the DRKTC on the friction factor ( f ) and average Nusselt number ( Nu ave) at the bottom wall of the channel were studied. The results show that the  f  of the DRKTC reduces by 29.4% and the comprehensive thermal coefficient ( F ) increases by 6.82% compared to the CYKTC under the same porosity and operating conditions. The parameter  α  has a greater influence on the  f , which enhances about 1.2 times when the  a  changes from 45° to 90°, and the effect of the  Nu aveis small, which only increases by 4.09%. A small  α  is a good choice for reducing pressure drop. The size of the rod windward area depends on the rod diameter, when the  d  increases from 1 mm to 3 mm, the  Nu aveincreases by 35.8%, and the  f  sharply increases by 153.6%. Based on the simulation results data, the fitting relations of the  f  and  Nu aveare fitted with a deviation of about 5%.

Heat transfer characteristics of a channel filled with the array of drop-shaped Kagome truss cores