مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی تجربی اثر مگنس روی یک پرتابه چرخان

نوع مقاله : پژوهشی اصیل

نویسندگان
دانشگاه صنعتی شریف
چکیده
یک روش تجربی جدید برای اندازه گیری توزیع فشار روی سطح یک مدل در حال چرخش در تونل باد توسعه داده شده است. در این تکنیک جدید که سنسورها و تجهیزات داده برداری داخل مدل درحال چرخش تعبیه شده اند از بسیاری از مشکلات فنی و محدودیتهای عملیاتی مرتبط با تلاشهای قبلی، جلوگیری می کند. توزیع فشار روی سطح برای سرعت های چرخشی تا 5000 دور بر دقیقه در زوایای مختلف حمله بدست آمده است. نتایج بدست امده از پروفیل های فشار، تعیین کننده نیروهای مگنس بوده و تفسیر لایه مرزی و اثرات جدایش جریان را امکان پذیر می سازند. در این روش علاوه بر تعیین نیروی مگنس، توزیع آن روی مدل نیز بدست می آید. نتایج بدست آمده نشان می دهد که قسمت اعظم نیروی مگنس در قسمتهای انتهایی پرتابه ایجاد می گردد. اعتبارسنجی داده ها با مقایسه مقادیر انتگرال توزیع فشار و مقایسه با داده های نیرویی بدست امده از سیستم بالانس تونل باد انجام شده است. نتایج مشابه با حل عددی به دست آمده و با داده های تجربی مقایسه شده است. این روش جدید قابلیت پیاده سازی روی انواع مدل ها و رژیم های جریان در تونل باد را دارا می باشد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Experimental study of the Magnus effect on a rotating projectile

نویسندگان English

farshid askary
M.R. Soltani
sharif university of technology
چکیده English

A new experimental technique has been developed to measure the pressure distribution over the surface of a spinning wind tunnel model. The technique is unique in that all elements of the instrumentation, thus avoiding many of the technical problems and operational limitations associated with previous attempts to measure this effect. Surface pressure distributions were obtained for selected tip speed ratios for different angles of attack. The results obtained from the pressure profiles determine the Magnus forces and make it possible to interpret the boundary layer and the effects of separation. The pressure distribution on the surface of the model for rotational speeds up to 5000 rpm is obtained at different angles of attack. The results show that most of the Magnus force is created at the ends of the projectile. The validity of the data was established by comparing the integrated pressure values with directly measured balance data. The resulting pressure profiles provide a quantitative measure of the Magnus forces and allow interpretation of boundary layer and flow separation effects. Similar results were obtained by the numerical simulations and were compared with the experimental data. This new technique can be applicable to a variety of model configurations and Mach number regimes.

کلیدواژه‌ها English

Magnus Effect
Spinning projectile
Surface pressure
Wind tunnel
[1] Jost Seifert, “A review of the Magnus effect in aeronautics”, Journal of Progress in Aerospace Sciences 55 (2012) pp. 17-45
[2] Miller, M. C., “Wind tunnel Measurements of the Magnus Induced Surface Pressure on a Spinning projectile in the transonic speed Regime “, Applied Aerodynamics Conference, AIAA-83-1838, Danvers, Massachusetts, 1983
[3] Raúlde CelisaLuis, Cadarsoa Jesús Sánchezb, “Guidance and control for high dynamic rotating artillery rockets“, Aerospace Science and Technology, Volume 64, May 2017, Pages 204-212
[4] Salimipour, S., Teymourtash, A., Mamourian, M., “ Trajectory Modification of a Transonic Spherical Projectile Under Hop-up Mechanism”, Scientia Irannica, 2019; 26(2): 796-807. Doi: 10.24200/sci.2018.20224
[5] Wessam, M.E. Flow field investigations and aerodynamic characteristics of artillery projectile, International Conference of Electrical, Automation and Mechanical Engineering (EAME 2015)
[6] Chughtai, F.A., Masud, J., Akhtar, S. Effect of Design Modifications on Computed Trajectory of a Large-Caliber Spinning Projectile, AIAA Atmospheric Flight Mechanics Conference AIAA 2016–0785, 4–8 January 2016, San Diego, California, USA, AIAA SciTech.
[7] F.A. Chughtai (a1), J. Masud and S. Akhtar ,” Unsteady aerodynamics computation and investigation of magnus effect on computed trajectory of spinning projectile from subsonic to supersonic speeds“,The Aeronautical Journal, Volume 123, Issue 1264, June 2019 , pp. 863-889
[8] Nikitin, S. A., "Aerodynamic Characteristics of a Spinning Body of Revolution Situated at an Angle of Incidence in a Flow," (In Russian), Izvestiia, Seriia, Fizicheskikh: Tekhnicheskikh Nauk, No. 6, 1967, pp. 63-70.
[9] Power, H. L. and Iversen, J. D., "Magnus Effect on Spinning Bodies of Revolution,"AIAA Journal, Vol. 11, No. 4, April 1973, pp. 417-418.
[10] E. R. Gowree and S. A. Prince, “A Computational Study of the Aerodynamics of a Spinning Cylinder in a Cross flow of High Reynolds Number”, 28th International Congress of the Aeronautical Sciences, ICAS 2012.
[11] Jenke, L. M., "Experimental Roll-Damping, Magnus and Static Stability Characteristics of Two Slender Missile Configurations at High Angles of Attack (0 to 90 Deg.) and Mach Numbers 0.2 Through 2.5", AEDC-TR-76-58, July 1976.
[12] Sturek, W., Dwyer, H., Kayser, L., Nietubicz, C., Reklis, R., Opalka, K., "Computations of Magnus Effects for a Yawed, Spinning Body of Revolution", AIAA Journal, Vol. 16, No. 7, pp. 687-692, July 1978
[13] Jacobson, I. D., "Magnus Characteristics of Arbitrary Rotating Bodies", Univ. of Virginia, DP 7049, 1972
[14] Martin, J. C., "On Magnus Effect Caused by Boundary Layer Displacement Thickness in Bodies of Revolution at Small Angles of Attack" , J. of Aeronautical Science, Vol. 24, No. 6, 1957. pp 42I-429.
[15] Lin. T. C. and Robin S. G., "Viscous Flow over Spinning Cones at Angles of Attack". AIAA Journal. Vol. 12, April 1971. pp. 975-985
[16] Sturek, w. S., Mylin. D.C., Bush, C. C., "Computational Parametric Study of the Aerodynamics of Spinning Slender Bodies at Supersonic Speeds", AIAA Paper 80-1585, Aug. 1980.
[17] Sturek, W. B. and Schiff, L.8., "Numerical Simulations of Stady Supersonic Flow over Spinning Bodies of Revolution". AIAA Journal, Vol. 20, No.12. 1982.
[18] Pechier. M., Guillen P. and Cayzac, R. ,"A Combined Theoretical Experimantal Investigation of Magnus Effects", AIAA Paper 98-2797, l998
[19] Zhiyuan Wei, Lijie Ding, Kai Wei,” Trajectory Prediction of Rotating Objects in Viscous Fluid: Based on Kinematic Investigation of Magnus Glider”, eprint arXiv:1610.02768v1, Oct 2016
[20] Siegel, Noah W., et al. "An Experimental Setup to Characterize Boundary Layer Asymmetry on a Spinning Projectile Using Magnetic Resonance Velocimetry." Proceedings of the ASME 2018 International Mechanical Engineering Congress and Exposition. Volume 7: Fluids Engineering. Pittsburgh, Pennsylvania, USA. November 9–15, 2018. V007T09A002. ASME.
[21] R. Cayzac, E. Carette, P. Denis, P. Guillen, "Magnus effect: physical origins and numerical prediction", Journal of Applied Mechanics, vol. 78, no. 5, pp. 748-760, 2011.
[22] J. DeSpirito, "CFD aerodynamic characterization of 155-mm projectile at high angles-of-attack", 35th AIAA Applied Aerodynamics Conference, pp. 3397-3417, 2017
[23] Swanson, W. M.,"The Magnus Effect: A Summary of Investigations to Date", J. of Basic Engineering. pp 461-470, 1961
[24] M.Farahani, M.M.Mahdavi , “A proposed design method for supersonic inlet to improve performance parameters”, Aerospace Science and Technology, Volume 91, August 2019, Pages 583-592
[25] Mohammad Farahania1, AbbasDalirib, Javad SepahiYounsi, “Supersonic inlet buzz detection using pressure measurement on wind tunnel wall “, Aerospace Science and Technology, Volume 86, March 2019, Pages 782-793
[26] Shiavetta L. A., Badcock K. J. Cummings R. M. Comparison of DES and URANS for unsteady vortical flows over delta wings. AIAA Paper 2007-1085. Presented at the 45th AIAA Aerospace Sciences Meeting and Exhibit, January 8, 2007, pages 1-22.