Cruz-Pérez, Benjamín

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    Turbulent flow over a pin fin array: parametric study
    (2010-05) Cruz-Pérez, Benjamín; Leonardi, Stefano; College of Engineering; Pandya, Vikram; Gutierrez, Gustavo; Department of Mechanical Engineering; Pando, Miguel
    Modern jet engines reach very high combustion temperatures to achieve higher thermal efficiencies which can damage the turbine blades. Damage can occur in the turbine blade due to the temperature difference between the interior and the exterior causing material creep and thermal fatigue. To avoid damage efficient cooling systems have been proposed such as film cooling, internal channels, and pin fins. This research focus on pin fins, which are small protruding cylinders at the trailing edge of the turbine blade, specifically the purpose of this work is to find the optimum layout of pin fins such that it enhances the heat transfer process with a minimum pressure drop. To find this optimum pin configuration experiments and numerical simulations have been performed. Experiments consisted on determine the friction factor for pin fins arrays ranging from one row to ten rows at equally spaced intervals and various Reynolds number (Re). Experiments demonstrated that for arrays with more than 6 rows of pin fins the friction factor follows a decreasing trend as the Re increases and the pressure drop due to the array to the total pressure drop ratio is about 90%. The numerical method used for the Direct Numerical Simulations (DNS) is the same presented by [1]. DNS consisted on changing the spacing between the pin fins and the Re. For a fixed spanwise distance the streamwise distance was varied and for a fixed streamwise distance the spanwise distance was varied for a constant Re. Finally, for a fixed spacing the Re was varied. The numerical results shows that the heat transfer trends to increase as the spacing between the pin fins becomes smaller, and the friction factor decreases as the spacing becomes larger. For a fixed pin configuration, the heat transfer and the friction factor increases with decreasing Re.