TY JOUR TI CALCULATION OF PRESSURE DROP IN MULTI-STAGE VORTEX DEVICES WITH PRE-SWIRLED GAS FLOW KW PRESSURE DROP KW CENTRIFUGAL NOZZLE KW SWIRLING FLOW KW ENERGY EFFICIENCY JO Herald of Technological University AU Har'kov, V.V. AU , .. PY 2026 IS 29 PB Kazan National Research Technological University