INVESTIGATION OF OFF-DESIGN PERFORMANCE OF VANED DIFFUSERS IN CENTRIFUGAL COMPRESSORS PART Ⅰ: A CHANNEL-WEDGE DIFFUSER

摘要

Experimental and numerical investigations of the off-design performance of a simple channel-wedge diffuser in a small centrifugal compressor are presented. Surge and choke conditions as well as design point are considered using somewhat limited range of experimental data and also supplementary 3D CFD results. Some critical meanline design parameters' behavior is investigated numerically, to render the basis for improved modelings in the meanline performance prediction.