Particle Image Velocimetry : a breakthrough in experimental aerodynamics for industry.

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1 Hamburg 29-31/01/01 EUROPIV 2 Particle Image Velocimetry : a breakthrough in experimental aerodynamics for industry. M. Stanislas, J. Kompenhans, W. Kühn, J. Courty, M. Deschamps Contracts numbers : BR.PR-CT G4RD-CT

2 The EUROPIV project Industry DASSAULT AVIATION DASA SIREHNA Research Organizations CIRA ISL DLR NLR DRA ONERA FFA VKI INTA Delft Madrid Oldenburg Rome Warwick University Rouen (URACNRS 230) St Etienne(URACNRS 842) Lille (URACNRS 1441) TASK 1. CRITICAL EVALUATION OF THE EXISTING KNOW-HOW TASK 2. DEVELOPMENT OF SOME SPECIFIC ASPECTS OF THE METHOD TASK 3. EXTENSION TO THREE COMPONENTS MEASUREMENTS TASK 4. FULL SCALE TEST IN AN INDUSTRIAL FACILITY

3 Main Results 1. Introduction. 2. Tests and Comparison of Different Recording Set-ups. 3. Test and Comparison of Various Methods of Analysis and Post-Processing on a Database of PIV Records. 4. Full Scale PIV Test in a industrial Facility. 5. Numerical Simulation of the Industrial Test. 6. News Developments of the Method.

4 Extension to 3D2C Light In Flight Holographic PIV (Oldenburg University) a b c

5 Experimental Set-up EADS Bremen Wind tunnel Model span : m U = 54 m/s Re c = 2.01*10 6 Slat Body 80 mm Inner slat track 602 mm 500 mm

6 Experimental Set-up Test section model Glass window optics Light sheet laser camera Nd-YAG Laser 2 x 300 mj CCD camera 1000 x 1300 pixels Seeding : olive oil micron droplets

7 Pressure distribution alpha=12.5,ref BLR,MR24611 Prediction, 12 alpha=12,ref BLR alpha=13,ref BLR alpha=11.5,ref BLR 2 -cp x [cm] (1cm=2%) Pressure distribution on the model compared to numerical predictions

8 PIV results Example of instantaneous velocity map Regions of interest

9 PIV results Mean ω Z -vorticity component for all measuring positions α ref = 12.5 α = 21

10 PIV results u [m/s] PIV: run_l20_pos3_ang12,5,avg alpha=12.5, z=+0 mm, x/l=37% alpha=12.5, z=120 mm, x/l=37% alpha=12.5, z=-120 mm, x/l=37% pred. 12,37% y [mm] boundary layer velocity profile on the suction side, α ref =12.5, x/l = 37% (main body)

11 Computations Performed by Dassault Aviation with VIRGINI NS solver nodes steady with RANS standard k-ε model

12 Computations Low resolution DNS : time steps Time sequence of iso-entropy maps

13 Comparison PIV/Computations

14 Comparison PIV/Computations Laminar Navier-Stokes snapshots for instantaneous vorticity vorticity=vort*1000 Y Vort Y Vort X X Vort Vort Y 40 Y X X PIV Computations

15 Partial conclusion PIV has been been demonstrated in an industrial wind tunnel, PIV is an efficient technique to characterize unsteady phenomenon in large flow fields and to understand the physics of complex flows, PIV results are accurate and detailed enough to allow the validation of CFD.

16 EUROPIV 2 Project Industry Research org. University EADS DASSAULT AVIATION ITAP WP 1 WP 2 WP 3 WP 4 Turbulence & Near wall flow Assessment of vortical structures Full Scale Industrial Tests Advanced PIV Developments DELFT DLR DASA ISL T 1.1 T 1.2 T 2.1 T 2.2 T 3.1 T 3.2 T3.3 T3.4 T4.1 T4.2 Turbulence Near wall flows Seeding behavior Vorticity estimation CIRA DLR ISL NLR ONERA DNW EADS W/T Numerical simulations Modane S2 LML URA CNRS 1441 Delft Univ. Madrid Univ. Oldenburg Univ. Rome Univ. CORIA UMR CNRS 6614 St Etienne Univ. Zaragoza Univ. DNW LST Advanced PIV techniques & algorithms Holographic PIV CORIA DELFT DLR DLR EADS DASSAULT ONERA NLR MADRID ISL

17 WP 3.1 High lift aerodynamics Body Slat Inner slat track Flap Test in EADS Bremen wind tunnel PIV by AEREA consortium Computations by Dassault Aviation

18 WP 3.3 Transonic aerodynamics OAT15 wing profile ONERA S2 MODANE Buffeting conditions PIV by ONERA & DLR

19 WP3.4 Wake vortices Fokker F swept wing model DNW LST Wind tunnel Wake Vortices Steroscopic PIV Comparison with 5 holes probes

20 Conclusion Large progress in the PIV technique during the last 5 years, 2D2C PIV is now operational in several industrial wind tunnels in Europe, 2D3C Stereo PIV under development for Industrial wind tunnels, Europe is in a leading position for the development and the industrial application of this technique.