Numerical study on characteristics of temperature reduction and flow loss in radial pre-swirl system

To explore new method of structure design based on‘preswirl temperature-reduction effect’in preswirl system of aero-engine,the characteristics of temperature reduction and flow losses in radial pre-swirl system were studied,and numerical investigation was carried out on a simplified radial pre-swirl system.Numerical method was validated by experimental results;flow structure in the radial pre-swirl system was analyzed.Characteristics of temperature reduction and pressure losses were investigated with changes of rotational Reynolds number and non-dimensioned mass flow rate.The computational results show that:the numerical results coincide with the experimental results,and relative error is not more than 20%,proving that the reliability of CFD method;under certain conditions of the study,at the given non-dimensional mass flow rate,the temperature reduction and pressure losses of radial pre-swirl system decrease as the rotating Reynolds number increases;with the given rotational Reynolds number,the temperature reduction and pressure losses increase as the non-dimensional mass flow rate increases.