تحلیل عددی پارامتر‌های موثر بر آلودگی صوتی لبه فرار جریان لایه مرزی آشفته

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، دانشکده مهندسی مکانیک، دانشگاه یزد، یزد، ایران

2 هیات علمی-دانشگاه یزد

3 دانش‌آموخته دکتری، دانشکده مهندسی هوافضا، دانشگاه علوم و فنون هوایی شهید ستاری، تهران، ایران

چکیده

در مطالعه حاضر، یکی از مهم‌ترین مکانیزم‌های تولید نویز آیرودینامیکی به‌صورت عددی بررسی شده است. معادلات جریان ناپایای تراکم‌ناپذیر لایه مرزی آشفته با عدد ماخ 06/0، بر روی صفحه تخت به طول 30 سانتی‌متر با استفاده از رهیافت شبیه‌سازی گردابه‌های بزرگ در نرم‌افزار اوپن‌فوم حل شده و به منظور کاهش هزینه محاسباتی از مدل مرز ورودی لاند استفاده شده است. برای محاسبه پارامترهای موثر بر آلودگی صوتی لبه فرار ( شامل طیف فشار سطح، طول مشخصه نوسانات فشار در راستای دهانه مدل و سرعت جابجایی ساختارهای گردابه‌ای)، مقادیر فشار در نقاط مختلفی از سطح مدل صفحه تخت، با استفاده از ابزار کاوشگر داده‌برداری شده است. در نهایت آلودگی صوتی لبه فرار صفحه تخت در دوردست با استفاده از مدل تحلیلی امیت-راجر پیش‌بینی شده است. نتایج نشان داد که روش عددی بکار رفته در این مطالعه، ضمن برخورداری از هزینه محاسباتی معقول، از توانمندی مناسبی در پیش‌بینی مستقیم پارامترهای موثر بر آلودگی صوتی لبه فرار برخوردار است. همچنین بررسی پیش‌بینی و محاسبه مستقیم پارامترهای طیفی موثر بر آلودگی صوتی لبه فرار لایه مرزی آشفته، علاوه بر استفاده در مدل‌های پیش‌بینی آلودگی صوتی دوردست، اطلاعات دقیق و مناسبی از فیزیک جریان و ابعاد و طول عمر ساختارهای گردابه‌ای جریان لایه مرزی آشفته، فراهم می‌کند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical Analysis of Parameters Affecting Turbulent Boundary Layer Trailing-Edge Noise

نویسندگان [English]

  • Mohammad Farmani 1
  • Ali Akbar Dehghan 2
  • Abbas Afshari 3
1 PhD Student, Department of Mechanical Engineering, Yazd University, Iran
2 Mech. Eng. Dept, Faculty of Engineering, Yazd University, IRAN
3 Ph.D. Graduate, Aero. Eng., Shahid Sattari Aeronautical University of Science and Technology, Tehran, Iran
چکیده [English]

In the present study, one of the most important mechanisms of aerodynamic noise generation is investigated numerically. The Large-eddy simulation approach used to solve the unsteady flow equations of the turbulent boundary layer with Mach number 0.06 over a flat plate of length 30 cm. Lund's inflow boundary model used to reduce computational cost. In order to evaluate the parameters affecting trailing edge noise (including surface pressure spectra, the spanwise length scale of the surface pressure fluctuations and eddy convection velocity), data of surface pressure fluctuations values in different points over the flat plate surface are collected using the probe tool in OpenFOAM software. Based on the calculated parameters affecting the trailing edge noise, the far-field noise is predicted using the analytical Amiet-Roger model. The results showed that the numerical solution method used in this study is capable of predicting the effective parameters on the trailing edge noise with a reasonable computational cost. Studying the spectral parameters affecting the turbulent boundary layer trailing edge noise showed that prediction and direct estimation of these parameters can be used to predict the far-field noise propagation. Moreover, these parameters can provide proper information on the physics of the flow and dimensions and lifetime of turbulent boundary layer vortex structures.

کلیدواژه‌ها [English]

  • Numerical analysis
  • Boundary layer
  • Turbulent flow
  • Trailing edge noise

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 53، شماره 1 (Special Issue)
فروردین 1400
صفحه 437-452

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