Axial-Flow Compressor Rotor-Stator Interaction

摘要

In a typical axial-flow compressor stage, rotor wakes mix out and thus they lose energy downstream of each rotor blade trailing edge. Furthermore, rotor wake fluid is continuously severed by downstream stator blades into convected wake segments that interact with and influence the stator surface boundary layers. Related laboratory data were acquired and compared with computer code predictions. The rate and amount of rotor waking mixing-out loss appears to be larger than that modeled currently. The axial locations of the measurement stations used to assess rotor row and stator row loss values are important. If a portion of the rotor wake mixing-out loss occurs within the stator row, as defined by measurement station locations, that portion can represent a sizeable percentage of the stator row loss. Interaction between rotor blade wake segments and stator surface boundary layers can result in a higher loss in the stator wake than that expected if interaction effects are ignored. Stator boundary layer parameters periodically vary between laminar and turbulent flow values as rotor wake segments pass over the blade surfaces. Rotor wake segments move along the stator surfaces much as turbulent spots do, becoming wider as they progress downstream.