Abstract
The unsteady-state, incompressible and three-dimensional large eddy simulation (LES) was performed to analyze the structure of turbulent flow fields according to the operating load of one-pitched small-size helical axial fan (SSHAF). The static pressure coefficient distribution according to the flow coefficient of SSHAF does not include stall, and the maximum static pressure efficiency is about 13% higher than that of conventional small-size axial fan. The typical axial flow developed downstream of SSHAF decreases with increasing operating load, and external axial flow outside the fan center develops radially. There is a reverse flow in the internal flow developed downstream from the hub of SSHAF. As the operating load increases, the absolute velocity of the reverse flow increases and its space gradually increases to approach the hub side. Even with increasing operating load, the flow that develops downstream of SSHAF does not include full radial flow, unlike conventional small-size axial fan.
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