The effect of rotational Reynolds number and non-dimensional mass flow rate on the drop of cooling air temperature and flow loss of a simplified aero-engine pre-swirl system were investigated experimentally for two pre-swirl angles.A test rig was set up.Micro pressure transducers for measuring pressure of rotating disk surface were fixed on the disk

and the relative total pressure of the outlet of the pre-swirl system was obtained after calibrations.The rules of influences on drop of cooling air temperature and flow losses performance of pre-swirl cooling system were achieved.This shows that the cooling air temperature rises and then goes down with the increase of non-dimensional mass flow rate in the range of this study and these two pre-swirl angles

and decreases with the rising rotational Reynolds number;non-dimensional flow loss increases with the enlargement of non-dimensional mass flow rate

and decreases with the increment of the rotational Reynolds number.