Abstract
Large-eddy simulation (LES) of compressible low-Reynolds-number (Re) flows in small radial turbines with the rotor diameter of 46mm and 8mm is performed. Conditions of pressure ratio of 1.5 and isentropic velocity ratio of 0.6 are assumed, and the tip clearance of 2.7% the blade height is taken into account. In addition to the computations, Reynolds-averaged Navier-Stokes simulation (RANS) based on the Baldwin-Lomax turbulence model and aerodynamic tests are also conducted. Based on the results, the differences in the prediction of loss between LES and RANS, Reynolds number effects on the intermal flows and a method of efficiency improvement are discussed.
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