Experimental study of the heat transfer of blade windmill of H rotr

Abstract

When rotating the turbine there are natural convection in internal cavities of hollow elements of H rotor wind turbine due to centrifugal forces. This allows you to organize the thermal protection turbines operating in harsh environments. Knowing middle consumed speed internal cavities of different shape and purpose can experimentally determine the heat transfer coefficient. For this purpose we prepared experimental facility for the study of heat transfer of an airfoil NASA - 0021 to accumulate its air flow at various speeds and angles of attack. In other words, to determine the heat transfer coefficient of a symmetric airfoil profile NASA - 0021 (used as swings and working wind turbine blades Darya) by blowing its inner cavity heated air. Thus, the problem is the experimental study of heat transfer element of a symmetric airfoil profile of NASA - 0021 (used as swings and Darrieus wind turbine blades work) by blowing its internal cavity heated air at different angles of attack and speeds of the external flow. In the internal cavity element of the blade is supplied heated air flow from the muffle furnace at four values of its consumption (Q1 = 0,00103 m3 / s, Q2 = 0,00153 m3 / s, Q3 = 0,00203 m3 / s, Q4 = 0,00253 m3 / s).