14th European Conference on Turbomachinery Fluid dynamics & Thermodynamics
Heat Transfer & Cooling
The efficiency of the oxy-fuel combustion power cycles significantly depends on gas turbine cooling losses. The high density and low viscosity of the supercritical carbon dioxide determine significant coolant mass flow in cooling channels. Increasing the firing temperature in carbon dioxide gas turbines requires the growth of the cooling system effectiveness. This investigation focus on the development of the heat transfer enhancement method for the blade trailing edge of a carbon dioxide gas turbine. A numerical study was conducted to investigate the heat transfer and the flow friction performance in rectangular channels with staggered arrays of pin fins, which were modified by the installation of the back ribs. The comparison based on the numerical data in the Reynolds number range of 20000 – 100000 showed that the back ribs application has increased convective heat transfer performance of the channel with pin fins by 43-58%. It was found that the back ribs installation allow eliminating the stagnation zone formed behind the pin fins. Besides, an influence of the geometric parameters and the shape of the back ribs on thermal-hydraulic characteristics of the channel were analyzed.