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پیش‌بینی نویز آیروآکوستیکی دوردست از مدل ساختمان بلند استاندارد به کمک اندازه‌گیری ناپایای فشار سطحی | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 12، دوره 52، شماره 7، مهر 1399، صفحه 1885-1904 اصل مقاله (2.91 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2018.14260.5826 | ||
| نویسندگان | ||
| علیرضا موحدی1؛ علی اکبر دهقان* 2؛ مجتبی دهقان منشادی3 | ||
| 1دانشگاه یزد | ||
| 2هیلت علمی-دانشگاه یزد | ||
| 3دانشیار دانشگاه مالک اشتر | ||
| چکیده | ||
| در مطالعه حاضر، نویز آیروآکوستیکی ناشی از جریان حول مدل یک ساختمان استاندارد متصل به کف در زوایای حمله مختلف به روش نیمه تحلیلی پیش‌بینی شده است. هدف اصلی این مطالعه، محاسبه فشار آکوستیکی دوردست با استفاده از داده‌های تجربی فشار سطحی روی مدل است. با استفاده از این داده‌های تجربی و معادله فوکس ویلیامز- هاوکینگز که در یک کد پیاده‌سازی شده است فشار آکوستیکی دوردست محاسبه می‌شود. مشخصات آیرودینامیکی و آکوستیکی جریان حول یک سیلندر مربعی دو بعدی )به جهت اعتبارسنجی( و نیز مدل اصلی ارائه گردیده است. مشخص شد در طیف فشار سطحی مربوط به سنسورهای فشار وجوه جانبی، قله مربوط به ریزش گردابه قابل مشاهده است که در هماهنگی با فرکانس ریزش گردابه حاصل از جریان‌سنج سیم داغ بود. عدد استروهال برای مدل بسته به زاویه حمله در محدوده 0/1-0/08 به دست آمد. همچنین الگوی انتشار صدای دوقطبی برای هندسه‌های سه بعدی نیز قابل مشاهده بود که مرتبط با منشا ایجاد آن یعنی پدیده ریزش گردابه است. شدت صدای پیش‌بینی شده با افزایش سرعت بالادست افزایش و با افزایش فاصله از سیلندر کاهش می‌یابد. با توجه به عدم تقارن کامل سطح مقطع مدل مورد بررسی، با تغییر زاویه حمله، صدای پیش‌بینی شده بسته به محل شنونده رفتار متفاوتی دارد. | ||
| کلیدواژه‌ها | ||
| ساختمان بلند استاندارد: نویز آیرودینامیکی: فشار سطحی: معادله فوکس ویلیامز؛ هاوکینگز : ریزش گردابه | ||
| عنوان مقاله [English] | ||
| Far-field Aeroacoustic Noise Prediction of a Tall Standard Building Model by Measuring Unsteady Surface Pressures | ||
| نویسندگان [English] | ||
| Alireza Movahedi1؛ Ali Akbar Dehghan2؛ Mojtaba Dehghan Manshadi3 | ||
| 1University of Yazd | ||
| 2Mech. Eng. Dept, Faculty of Engineering, Yazd University, IRAN | ||
| 3Malek Ashtar University of Technology | ||
| چکیده [English] | ||
| In the present study, far-field aeroacoustic noise emitted due to the air flow over a standard tall building model at different angles of attack is investigated. The purpose of this study is to estimate the far-field aeroacoustic noise emitted by measuring the unsteady surface pressures. The surface pressure data are used as input of a numerical algorithm which is written to solve the Ffowcs Williams and Hawkings equation. The aerodynamic and aeroacoustic characteristics of flow over a twodimensional square cyliner (for algorithm validation) and the main model are presented. The results revealed that the peak of vortex shedding frequency could be observed in the spectrum of surface pressure signals of sensors located on the side surfaces of the model. Its frequency is in an excellent agreement with the signals captured by hot wire measurement. The Strouhal number changes in the range of 0.08-0.1 depending on the angle of attack. Dipole pattern for sound radiation was also observed for three-dimensional model which is related to the vortex shedding phenomenon. The sound pressure level increases with increasing upstream velocity and decreases with distance from the model. The effect of angle of attack is also dependent on the reciever’s location. | ||
| کلیدواژه‌ها [English] | ||
| CAARC tall building, : Aeroacoustic noise: Surface pressure, : FW-H analogy: Vortex shedding | ||
| مراجع | ||
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[1] C. Mannini, A.M. Marra, L. Pigolotti, G. Bartoli, The effects of free-stream turbulence and angle of attack on the aerodynamics of a cylinder with rectangular 5:1 cross section, Journal of Wind Engineering and Industrial Aerodynamics, 161 (2017) 42-58. [2] Z. Hosseini, J. Bourgeois, R. Martinuzzi, Large-scale structures in dipole and quadrupole wakes of a wallmounted finite rectangular cylinder, Experiments in fluids, 54(9) (2013) 1595. [3] S. Fathi, A.A. Dehghan, M. Dehghan Manshadi, A. Movahedi, Experimental Investigation of Flow Around a 3D Square Cylinder Using Five-hole Probe and Neural Networks Method, Amirkabir Journal of Mechanical Engineering, 49(1) (2017) 67-82. [4] R. Wardlaw, G. Moss, A standard tall building model for the comparison of simulated natural winds in wind tunnels, Report CC-662 tech, Commonwealth Advisory Aeronautical Research Council, 1970. [5] W. Melbourne, Comparison of measurements on the CAARC standard tall building model in simulated model wind flows, Journal of Wind Engineering and Industrial Aerodynamics, 6(1) (1980) 73-88. [6] G.N. Lygidakis, S.S. Sarakinos, I.K. Nikolos, Simulation of the Flow Over the CAARC Standard Tall Building Using Different LES Turbulence Models, in: ASME 2016 International Mechanical Engineering Congress and Exposition, American Society of Mechanical Engineers, 2016. [7] A. Elshaer, H. Aboshosha, G. Bitsuamlak, A. El Damatty, A. Dagnew, LES evaluation of wind-induced responses for an isolated and a surrounded tall building, Engineering Structures, 115 (2016) 179-195. [8] A.K. Dagnew, G.T. Bitsuamalk, R. Merrick, Computational evaluation of wind pressures on tall buildings, in: 11th American conference on Wind Engineering. San Juan, Puerto Rico, 2009. [9] F.-Q. Meng, B.-J. He, J. Zhu, D.-X. Zhao, A. Darko, Z.-Q. Zhao, Sensitivity analysis of wind pressure coefficients on CAARC standard tall buildings in CFD simulations, Journal of Building Engineering, 16 (2018) 146-158. [10] W. King, E. Pfizenmaier, An experimental study of sound generated by flows around cylinders of different cross-section, Journal of Sound and Vibration, 328(3) (2009) 318-337. [11] D. Moreau, C.J. Doolan, The flow-induced sound of a wall-mounted finite length cylinder with circular and square cross-section, in: 19th AIAA/CEAS Aeroacoustics Conference, Berlin, Germany 2013. [12] A. Movahedi, A.A. Dehghan, M.D. Manshadi, Experimental Investigation of aero acoustic noise generation process from a wall mounted square cylinder at incidence, Modares Mechanical Engineering, 17(9) (2017) 327-338. [13] R. Porteous, D.J. Moreau, C.J. Doolan, The aeroacoustics of finite wall-mounted square cylinders, Journal of Fluid Mechanics, 832 (2017) 287-328. [14] K. Karthik, S. Vengadesan, S. Bhattacharyya, Prediction of flow induced sound generated by cross flow past finite length circular cylinders, The Journal of the Acoustical Society of America, 143(1) (2018) 260-270. [15] A. Najafian, H. Parhizkar, S. Ghasemlooy, A. Tarabi, Numerical calculation of the sound produced by the wind flow around the cylinder and correction of the sound amplitude by increasing the length, Modares Mechanical Engineering, 18(03) (2018) 440-450. [16] R. Maryami, A.A. Dehghan, a. afshari, Experimental investigation of the turbulence effect of incoming flow on the unsteady pressure field and the flow noise around circular cylinder, Amirkabir Journal of Mechanical Engineering, 52(4) (2018) 111-120. [17] M.J. Lighthill, On Sound Generated Aerodynamically. II. Turbulence as a Source of Sound, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 222(1148) (1954) 1-32. [18] N. Curle, The Influence of Solid Boundaries upon Aerodynamic Sound, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 231(1187) (1955) 505-514. [19] J.F. Williams, D.L. Hawkings, Sound generation by tbulence and surfaces in arbitrary motion, Phil. Trans. R. Soc. Lond. A, 264(1151) (1969) 321-342. [20] C. Cheong, P. Joseph, Y. Park, S. Lee, Computation of aeolian tone from a circular cylinder using source models, Applied Acoustics, 69(2) (2008) 110-126. [21] D.A. Russell, J.P. Titlow, Y.-J. Bemmen, Acoustic monopoles, dipoles, and quadrupoles: An experiment revisited, American Journal of Physics, 67(8) (1999) 660-664. [22] Y. Wang, J. Chen, H. Lee, K. Li, Accurate simulations of surface pressure fluctuations and flow-induced noise near bluff body at low mach numbers, in: The Seventh International Colloquium on Bluff Body Aerodynamics and Applications (BBAA7), Shanghai, China, 2012. [23] S.W. Rienstra, A. Hirschberg, An introduction to acoustics, Extended and revised edition of Report IWDE92-06, Eindhoven University of Technology, 2017. [24] M. Mohamadrezaei, A.A. Dehghan, A. Movahedi, Comparison of different methods of numerical simulation of flow and sound around a square cylinder at various incidence angles, Modares Mechanical Engineering, 17 (2017) 147-158. [25] J. Dorneanu, Whistling of a rod in cross-flow: effect of angle of attack and reynolds number, MSc. Thesis, University of Twente, 2010. [26] H. Tanaka, N. Lawen, Test on the CAARC standard tall building model with a length scale of 1: 1000, Journal of Wind Engineering and Industrial Aerodynamics, 25(1) (1986) 15-29. [27] S. Huang, Q. Li, S. Xu, Numerical evaluation of wind effects on a tall steel building by CFD, Journal of Constructional Steel Research, 63(5) (2007) 612-627. [28] S. Gowing, Pressure and shear stress measurement uncertainty for DARPA SUBOFF experiment, David Taylor research center Bethesda MD ship hydromechanics Dept., 1990. [29] E. Obasaju, Measurement of forces and base overturning moments on the CAARC tall building model in a simulated atmospheric boundary layer, Journal of Wind Engineering and Industrial Aerodynamics, 40(2) (1992) 103-126. [30] A.L. Braun, A.M. Awruch, Aerodynamic and aeroelastic analyses on the CAARC standard tall building model using numerical simulation, Computers & Structures, 87(9-10) (2009) 564-581. [31] S. Becker, M. Kaltenbacher, I. Ali, M. Escobar, C. Hahn, Sound Generation by Flow around Simple Geometries: Simulation and Experiment, in: 12th AIAA/CEAS Aeroacoustics Conference (27th AIAA Aeroacoustics Conference), Cambridge, Massachusetts, 2006. | ||
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