Three-dimensional flow field downstream of an embedded stator in a multistage axial flow compressor: Part 2: Deterministic stress and heat flux distribution and average-passage equation system

Abstract

The results from the area traverse measurements of the unsteady velocity and total temperature downstream of the second stator of a three-stage axial flow compressor have been correlated to derive various deterministic stress and heat flux terms. These terms are consistent with those arising from the average-passage equation system of Adamczyk. The deterministic periodic stress and heat flux terms were found to be larger than the aperiodic terms for both the normal and the shear components. Consequently the terms involving the aperiodic components in the average-passage equations could be neglected for stator exit and rotor inlet flow modelling. The deterministic periodic normal and shear stresses were seen to be most significant in the stator wakes away from the end-wall regions. The most significant shear stress correlation was between the axial and the tangential velocity components. Since the correlations involving the radial component were small, it is postulated that the dominant mechanism for mixing (in the radial direction) is due to the steady deterministic radial velocity. All three components of deterministic heat flux were found to be significant in this flow field, especially in the wakes. The dominant terms in the average-passage equation system away from the end walls were due to the tangential gradient compared with the radial gradient terms and both the terms were found to be of equal importance in the hub and casing end-wall regions.