REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

NUMERICAL AND EXPERIMENTAL ASSESSMENT OF TRANSONIC TURBULENT FLOW AROUND ONERA M4 MODEL

JELENA SVORCAN

University of Belgrade, Faculty of Mechanical Engineering, Belgrade, jsvorcan@mas.bg.ac.rs

DIJANA DAMLJANOVIĆ

Military Technical Institute, Belgrade, didamlj@gmail.com

DRAGAN KOMAROV

University of Belgrade, Faculty of Mechanical Engineering, Belgrade, dkomarov@mas.bg.ac.rs

SLOBODAN STUPAR

University of Belgrade, Faculty of Mechanical Engineering, Belgrade, sstupar@mas.bg.ac.rs

NEBOJŠA PETROVIĆ

University of Belgrade, Faculty of Mechanical Engineering, Belgrade, npetrovic@mas.bg.ac.rs

Abstract: Experimental investigation of transonic flow at Mach number of 0.84 around a subsonic/transonic transport calibration model ONERA M4 at four different angles-of-attack has been conducted in T-38 trisonic blow-down wind tunnel of the Serbian Military Technical Institute. Experimental results include relative pressure and pressure coefficient distributions along three wing sections. Obtained aerodynamic performance data present a good basis for CFD studies. Both experimental and numerical set-ups and processes are briefly described. Numerical simulations are performed in ANSYS FLUENT 16.2 with several different turbulence models employed. Two different sets of results are presented and compared. Pressure distribution along the wing surface, sonic bubble on the wing suction side and wing-tip vortex have been investigated in more detail and presented in form of contours and iso-surfaces.

Keywords: transonic flow, experiment, CFD, turbulence models, wing-tip vortex