THERMAL SCIENCE
International Scientific Journal
TURBULENCE INVESTIGATION OF THE NASA COMMON RESEARCH MODEL WING TIP VORTEX
ABSTRACT
The paper presents high-speed stereo particle image velocimetry investigation of the NASA Common Research Model wing tip vortex. A three-percent scaled semi–span model, without nacelle and pylon, was tested in the 32- by 48-inch Indraft tunnel, at the Fluid Mechanics Laboratory at the NASA Ames Research Center. Turbulence investigation of the wing tip vortex is presented. Measurements of the wing-tip vortex were performed in a vertical cross-stream plane three tip-chords downstream of the wing tip trailing edge with a 2 kHz sampling rate. Experimental data are analyzed in the invariant anisotropy maps for three various angles of attack (0°, 2°, and 4°) and the same speed generated in the tunnel (V∞ = 50 m/s). This corresponds to a chord Reynolds number 2.68x105, where the chord length of 3” is considered the characteristic length. The region of interest was x = 220 mm and y = 90 mm. The 20 000 particle image velocimetry samples were acquired at each condition. Velocity fields and turbulence statistics are given for all cases, as well as turbulence structure in the light of the invariant theory. Prediction of the wing tip vortices is still a challenge for the computational fluid dynamics codes due to significant pressure and velocity gradients. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. TR 35046]
KEYWORDS
PAPER SUBMITTED: 2016-10-05
PAPER REVISED: 2016-10-22
PAPER ACCEPTED: 2016-12-22
PUBLISHED ONLINE: 2017-01-14
THERMAL SCIENCE YEAR
2017, VOLUME
21, ISSUE
Supplement 3, PAGES [S851 - S862]
- Vassberg, J.C., et al., Development of a common research model for applied CFD validation studies, Proceedings, 26th AIAA Applied Aerodynamics Conference, Honolulu, Hawaii, AIAA Paper no. 2008-6919.
- Acheson, M.J., Balakrishna, S., Effects of active sting damping on common research model data quality, Proceedings, 49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, Orlando, Florida, AIAA Paper no. 2011-878.
- Balakrishna, S., Acheson, M.J., Analysis of NASA common research model dynamic data, Proceedings, 49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, Orlando, Florida, AIAA Paper no. 2011-1127.
- Bell J.H., Pressure-sensitive paint measurements on the NASA common research model in the NASA 11-ft transonic wind tunnel, Proceedings, 49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, Orlando, Florida, AIAA Paper no. 2011-1128.
- Rodi, W., DES and LES of Some Engineering Flows, Fluid Dynamics Research, 38 (2006), 2-3, pp. 145-173
- Zilliac, G.G., et al., A Comparison of the measured and computed skin friction distribution on the common research model, Proceedings 49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, Orlando, Florida, AIAA Paper no. 2011-1129.
- Rivers, M.B., Dittberner A., Experimental investigations of the NASA Common Research Model in the NASA Langley National Transonic Facility and NASA Ames 11-Ft Transonic Wind Tunnel (Invited), Proceedings, 49th AIAA Aerospace Sciences Meeting including New Horizons Forum and Aerospace Exposition, Orlando, Florida, AIAA Paper no. 2011-1126.
- Rivers, M.B., Hunter, C.A., Support system effects on the NASA common research model, Proceedings, 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, Nashville, Tennessee, AIAA Paper no. 2012-0707.
- Rivers, M.B., et al., Further investigation of the support system effects and wing twist on the NASA common research model, Proceedings, 30th AIAA Applied Aerodynamics Conference, New Orleans, Louisiana, AIAA Paper no. 2012-3209.
- Illi, S.A., et al., Transonic tail buffet simulations for the common research model, Fluid Dynamics and Co-located Conferences, , Proceedings, 31st AIAA Applied Aerodynamics Conference, San Diego, CA AIAA Paper no. 2013-2510.
- Čantrak, Đ.S., et al., Time-resolved stereo PIV investigation of the NASA Common Research Model in the NASA Ames Fluid Mechanics Laboratory 32- by 48-in indraft wind tunnel, Annual Research Briefs, Center for Turbulence Research, Stanford University/NASA Ames, (2014), pp. 179-191.
- Konrath, R., et al., High-Speed PIV applied to wake of NASA CRM model in ETW under high Renumber stall conditions for sub- and transonic speeds, Proceedings,53rd AIAA Aerospace Sciences Meeting, AIAA SciTech, Kissimmee, Florida, AIAA 2015-1095.
- Rivers, M.B., et al., Comparison of the NASA Common Research Model European Transonic Wind Tunnel Test Data to NASA Test Data (Invited), Proceedings, 53rd AIAA Aerospace Sciences Meeting, AIAA SciTech, Kissimmee, Florida, AIAA 2015-1093.
- NASA Ames Research Center Fluid Mechanics Laboratory: Standard Operating Procedures, Document No. AOX-2010-001 (2010).
- http://commonresearchmodel.larc.nasa.gov/geometry/
- Schairer, et al., Predicting camera views for image-based measurements in wind tunnels, AIAA Paper no. 2005-1349.
- Čantrak, Đ.S., et al., Laser insight into the turbulent swirl flow behind the axial flow fan, ASME Paper no. GT2014-26563 (2014).
- Javadi, A., Nilsson, H., LES and DES of strongly swirling turbulent flow through a suddenly expanding circular pipe, Computers & Fluids, 107 (2015), pp. 301-313.
- Lumley, J.L., Newman, G.R., The return to isotropy of homogeneous turbulence. J. Fluid Mech., 82 (1977), pp. 161-178.
- Lumley, J.L., Choi, K.S., The return to isotropy of homogeneous turbulence, J. Fluid Mech., 436 (2001), pp. 59-84.
- Song, K., et al., Relaminarization of Wall Turbulence by High-Pressure Ramps at Low Reynolds Numbers, Thermal Science, 20 (2016), Suppl. 1, pp. S93-S102
- Čantrak, Đ.S., Analysis of the vortex core and turbulence structure behind axial fans in a straight pipe using PIV, LDA and HWA methods, Ph. D. thesis, University of Belgrade, Serbia (2012)
