Experimental Study and Theoretical Prediction of Secondary Flows in a Transonic Axial Flow Compressor

Abstract

Detailed time-mean measurements have been realized on a transonic axial flow compressor. Flow quantities in the secondary flow regions have been obtained. The purpose of this paper is to present some essential features which drive the secondary following development in axial compressor among others, the strong influence of secondary vortex motion on the energy transfer between the flow and the blading is displayed. Also, we study the effect of tip clearance and axial distance between blade row. A secondary flow model is used for comparisons with theoretical computations. Very good comparisons have been obtained which show the validity of the theoretical model, in particular, the decomposition of the secondary flow into a viscous part and a vortical part, using an inviscid flow as a basis.

Computation of Secondary Flows in an Axial Flow Compressor Including Inviscid and Viscous Flow Computation

“…The second test case concerns a secondary flow computation downstream of the stator of a transonic axial flow compressor stage. Detailed experimental results have been presented in references (5) and (6). We shall only illustrate the application of the method which is described in this paper, by the results presented figures 3.a and 3.b.…”