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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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