ABSTRACT
Methods of diagnosing aerodynamic characteristics are constantly developing in order to conduct the precise and energy efficient wind-tunnel testing of transport vehicles in the prototype design early stages. This is of a special importance when facing the time/cost consumption problems of detection of the transition zone over the simplified design of the high-speed train. Herein the applied thermodynamics found a very significant role in the field of experimental aerodynamics. With the intention of detecting the boundary layer transition zone the following measurements were applied: the infrared thermography, flow visualization and drag force measurements. In addition, the computational fluid dynamics was applied to predict the flow behavior and transition zone, solving partial differential equations consisting of the Reynolds-averaged Navier-Stokes equations, energy equation, and the equation of state for an ideal gas employing density-based solver. The thermal imaging defined the transition zone by simple application, and fast recognition, while the transition bounds were defined in the analysis. The flow visualization confirmed thermography results and the method itself as favorable, especially in the most expensive early phases of redesigning for aerodynamically optimized and energy efficient solutions. The numerical method was confirmed by the experiments, resulting in acceptable differences in the definition of the transition zone. For a better understanding of the phenomenon, the overlapped implementation of the presented methods focused on forced convection showed as the best solution. Based on the experiences of this research, development of the additional equipment and adjustments will be introduced in the future experiments.
KEYWORDS
PAPER SUBMITTED: 2017-06-19
PAPER REVISED: 2017-11-06
PAPER ACCEPTED: 2017-11-14
PUBLISHED ONLINE: 2018-01-07
THERMAL SCIENCE YEAR
2018, VOLUME
22, ISSUE
Issue 2, PAGES [1137 - 1148]
- Astarita, T., Carlomagno, G. M., Infrared Thermography for Thermo-Fluid-Dynamics, Springer-Verlag, Berlin Heidelberg, 2012
- Linić, S., Mrkalj, N., Wind Tunnel Design and Testing, Institut Goša, Belgrade, 2017
- Ristić, S., et al., Turbulence investigation in the VTI's experimental aerodynamics laboratory, Thermal Science (2016) OnLine-First Issue 00, Pages: 187-187, DOI: 10.2298/TSCI160130187R
- Ristić, S., et al., High Speed Train Model Testing in T-32 Wind Tunnel by Infrared Thermography and Standard Methods, Proceedings, 7th International Scientific Conference on Defensive Technologies, OTEH 2016, The Military Technical Institute, Belgrade, 6-7 Oct., 2016, pp. 35-40
- Ristić, S., et al., Estimation of Laser-Doppler Anemometry Measuring Volume Displacement in Cylindrical Pipe Flow, Thermal Science, 16 (2012), 4, pp.1027-1042
- Ristić, S., Flow Visualisation Techniques in Wind Tunnels Part I - Non optical Methods, Scientific Technical Review, 57 (2007) 1,
- Linic S., et al., Comparison of Numerically Obtained 2D Flow Fields for the Bionic High Speed Train Concept designs Inspired with Aquatic and Flying Animals, Proceedings on CD, 6th International Scientific Conference on Defensive Technologies, OTEH 2014, The Military Technical Institute, Belgrade, Serbia, 9-10 October, 2014, pp. 44-49
- Čantrak, Ð. 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, Center for Turbulence Research Annual Research Briefs, (2014), pp. 179-191
- Laurinavičius, D., et al., Measurement Of Water Temperature And Velocity Fields By Applying Thermography On Two-Phase Flow Through Horizontal Rectangular Channels, Thermal Science, doi.org/10.2298/TSCI160502129L
- Montelpare, S., Ricci, R., A thermographic method to evaluate the local boundary layer separation phenomena on aerodynamic bodies operating at low Reynolds number, International Journal of Thermal Sciences, 43 (2004), pp. 315-329
- Kozić, M., et al., Determination of the Temperature Distribution on the Walls of Ventilation Mill by Numerical Simulation of Multiphase Flow and Thermography, Proceedings on USB, 5th International Congress of Serbian Society of Mechanics, Arandjelovac, Serbia, June 15-17, 2015
- Andjelković, B. R., et al., Modeling Steady-State Thermal Defectoscopy of Steel Solids Using Two Side Testing, Thermal Science, 20 (2016), Suppl. 5, pp. S1333-S1343
- Simon, B., et al., IR-Thermography for Dynamic Detection of Laminar-Turbulent Transition, Proceedings, 18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics, July 4-7, Lisbon, Portugal, 2016
- Ahmed, S., R., Numerical methods for computation of flow around road vehicles, in: Aerodynamics of Road Vehicles: from Fluid Mechanics to Vehicle Engineering, (Ed. W.-H. Hucho), Butterworth-Heinemann, London, 1990, pp. 480-537
- White, F. M., Viscous Fluid Flow, 2nd Ed., McGraw-Hill, New York, USA, 1991
- Schlichting, H., Boundary-Layer Theory, 7th edn., McGraw-Hill, New York, USA, 1979
- Lienhard IV, J. H., Lienhard V, J. H., A Heat Transfer Textbook, Phlogiston Press, Cambridge Massachusetts, USA, 2008
- Versteeg, H. K., Malalasekera, W., An Introduction to Computational Fluid Dynamics - The Finite Volume Method, LONGMAN, Harlow, England, 1995
- Rašuo, B., Bionika u dizajnu (Bionics in Design - in Serbian), University of Belgrade, Faculty of Mechanical Engineering, Belgrade, eBook on CD, 2014
- ***, User's Manual, FLIR Exxx series, FLIR Systems, Pub.No. 7559597, December, 2010
- ***, ANSYS Fluent 12 User's and Theory Guide, ANSYS Inc., 2009
- Kozić, M., Primena numeričke dinamike fluida u aeronautici (Application of the Computation Fluid Dynamics in Aeronautics - in Serbian), Naučnotehničke informacije, Vojnotehnički institut, Belgrade, 2013