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

a high speed train model testing in T-32 wind tunnel by InfraRed thermography and standard methods

slavica ristiĆ

Institute Gosa, Belgrade, s1avce@yahoo.com

suzana liniĆ

Institute Gosa, Belgrade, sumonja@yahoo.com

goran ocokoljiĆ

Military Technical Institute, Belgrade, ocokoljic.goran@gmail.com

BoŠko RaŠuo

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

Vojkan LuČanin

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

Abstract: Experimental techniques in wind tunnel tests were always the state-of-art technologies and provide high quality results. In the resent experiments of the high-speed train model, run at the semi-open low-speed wind tunnel of the VTI, the infrared thermography (IRT) measurements were introduced. The intention was to observe the flow field behavior in vicinity of the high-speed train model surface by a multidisciplinary approach. Reynolds analogy make possible to correlate fluid dynamic to thermal field. By using high-sensitivity thermographic systems, temperature pattern on the surface of test model can be analyzed. Temperature distribution on the model surface is very complex, varies in the time and space, and depends on many combined effects related with flow and model characteristics. IC thermography can indirectly perform flow visualization in the boundary layer. Two standard techniques, aerodynamic drag measurements and the flow visualization with a TiO₂ emulsion were used, too. Experiments were performed for three velocities. The results show good correlation and thus verified the use of IR thermography for the non-invasive investigation of flow in the boundary layer in precision wind tunnel testing.

Keywords: wind tunnel, high-speed train model, visualization, thermography