NUMERICAL AND EXPERIMENTAL RESEARCH OF THE CIRCUMFERENTIAL GROOVES CASING TREATMENT INFLUENCING ON PERFORMANCE OF THE FIRST HIGH-LOADED COMPRESSOR STAGE

摘要

This work numerically and experimentally studies the typical first high-loaded compressor Stage A-1 in two configurations: with smooth walls and with circumferential grooves casing treatments above the rotor blade. Characteristics of the high-pressure compressor are strongly dependant on fineness of its first high-loaded stage. Therefore, designing and testing of an individual stage is an important task. The casing treatments lead to an increase in gas dynamic parameters of Stage A-1 and a decrease in its pulsations. This can be explained by the fact that grooves generate additional vortices, interacting with the main tip leakage vortex. This non-stationary interaction leads to a weaker tip leakage vortex and an improvement of flow in the Stage.