Abstract
Rotating detonation turbine engine is an innovative design to improve turbine engines at present. However, in practical application, rotating detonation waves will generate rotating pressure wave at the outlet of compressors, which may affect the aerodynamic stability of the compressor and thus its performance. In this paper, based on the unsteady Reynolds-Averaged Navier-Stokes method, three-dimensional numerical simulation was carried out to study the influence of propagating velocities and peak pressure of rotating pressure waves on the performance of centrifugal compressors. The results show that the rotating pressure wave forms a forward pressure wave in the compressor, which interacts with the diffuser and impeller blades to form a complex wave system. The impact of rotating pressure waves is differentiated from that of the unsteady rotor/stator interaction and the inconsistency is observed between the frequency within the impeller and diffuser. Generally, RPWs result in a decrease of static entropy within the impeller and an increase in entropy within the diffuser. While the entropy in the impeller remains relatively constant at a peak pressure of 0.6 MPa, entropy decreases as propagation velocity increases under other conditions. The presence of rotating pressure waves leads to the decline of mass flow rate and the rise of total pressure ratio. The total pressure ratio gradually rises with the increase of propagation velocity and peak pressure. While the mass flow rate and efficiency rise with the increase of propagation velocity and the decrease of peak pressure.
