Abstract
This paper proposes a detailed discussion on the influences of flow transition on heating capacity of wind power heat pump system based on a novel improved delayed detached eddy simulation (IDDES) method and thermodynamic analysis. A numerical study of DU-212 airfoil flow field at high Reynolds number (up to 1.5×107) is first conducted. It is found that with high Reynolds number (Re=1.5×107), flow transition is remarkably promoted and lower aerodynamic drag is achieved due to the decrease of momentum loss. Then, the influences of leading-edge trip on aerodynamic performances are studied and corresponding physical mechanisms are revealed. Furthermore, the heating capacity of a two-stage heat pump system is evaluated based on thermodynamic analysis. It is found that enhanced flow transition associated with leading edge trip could account for a reduction of heating capacity to at most 21.8% under certain circumstances. Eventually, the influences of evaporation and condensation temperature are briefly studied.
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