%0 Journal Article %T CALCULATION OF PRESSURE DROP IN MULTI-STAGE VORTEX DEVICES WITH PRE-SWIRLED GAS FLOW %A Har'kov, V.V. %A , .. %K PRESSURE DROP, CENTRIFUGAL NOZZLE, SWIRLING FLOW, ENERGY EFFICIENCY %J Herald of Technological University %D 2026 %N 29 %P 4 %I Kazan National Research Technological University