The Influence of Impeller Flow Channel Modification on Aerodynamic Performance of a Centrifugal Compressor Stage

Abstract

The modifications of meridional form and blade thickness of the impeller of an industrial radial compressor stage (impeller outlet blade angle 32 deg., relative width parameter 0.05) have been designed to extend the operating range of the stage in the area of higher flow rates and to reduce aerodynamic losses in this region. Quasi-3D calculations of the flow pattern in both original and modified impeller flow channels have been carried out to assess the influence of channel form change. The aerodynamic performance of the stage operating with both impellers has been tested on a test rig. The original stage was equipped with varied diffuser only, the modified one was tested with both vaned and vaneless diffusers. Detailed measurements of the flow field behind the impeller outlet have also been carried out. The results of these investigations are presented. Aerodynamic performance and losses in individual flow parts of the stages are compared and discussed.

Experimental investigation and numerical modelling of 3D radial compressor stage and influence of the technological holes on the working characteristics

“…The current development of the centrifugal compressor stages follows the systematic research and development program in the former ČKD company in the past; see for example the paper [2]. The experimental compressor stages verification is being realized in the development test facility HCKD built in Pilsen in 2013, where the single-stage test compressor DARINA IV with the exchangeable flow part is placed.…”

Numerical and experimental modelling of the centrifugal compressor stage – setting the model of impellers with 2D blades

“…The current development of the centrifugal compressor stages follows the systematic research and development program in the former ýKD company in the past; see for example the paper [3]. The experimental compressor stages verification is being realized in the development test facility HCKD built in Pilsen in 2013, where the single-stage test compressor DARINA IV with the exchangeable flow part is placed.…”