Experiment investigation on flow characteristics in a high speed rotor-stator cavity with axial air inflow

Abstract

Targeting the flow characteristics for the aircraft engine turbine rotor-stator cavity，a high speed rotor-stator cavity with axial throughflow was investigated experimentally. The influences of rotation speed and inlet mass flow on pressure characteristics, windage heating and swirl characteristics were studied mainly at different rotational speed ranges from 0 to 9000rpm and different mass flow rate ranges from 0.05kg/s to 0.15kg/s. An experiment technique that relative temperature was obtained by measuring absolute parameters in stator was tested as well. The experiment results show that rotational speed and inlet mass flow are main parameters which determine flow characteristics in rotor-stator cavity. The effect of centrifugal boosting, windage heating, and swirl characteristics rise with the increase of rotational speed. The maximum value of centrifugal boosting is 1kpa, windage heating is 26K, and swirl ratio is 0.36. Increasing rotational speed will lead to the opposite effect. When air flow is in state of heat balance, relative total temperature and adiabatic temperature can be obtained by measuring absolute temperature and swirl ratio at same radius. The maximum deviation is below 1K.