تحلیل فرکانس و تخمین پارامترهای تشکیل حباب در ستون سیال

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دوره دکتری، تهران، تربیت مدرس

2 دانشگاه تربیت مدرس

چکیده

ردیابی و شناسایی نویز حاصل از تشکیل حباب یکی از روش‌های بررسی خصوصیات فیزیکی حباب‌ها می‌باشد. در این تحقیق مدل تخمین نویزهای حاصل از تشکیل حباب در ستون سیال، با اعمال روش ترکیبی مدل‌سازی آشفتگی، در نظر گرفتن جریان تراکم پذیر، اعمال روش مناسب شبیه‌سازی سطح مشترک و استفاده از سطح مناسب برداشت داده‌های آکوستیک بهبود داده شده است. بر این اساس شبیه‌سازی سه‌بعدی جریان دوفازی تراکم‌پذیر با کمک روش حجم سیال انجام شده است. همچنین با استفاده از سطح مناسب برداشت داده‌های آکوستیک نویزهای حاصل از تشکیل حباب شناسایی شده است. شایان ذکر است ضمن نمایش استقلال مدل از شبکه، اعتبارسنجی مدل توسط تطبیق دادن نتایج با تئوری‌های موجود و مقایسه با داده‌های تجربی صورت پذیرفته است. در این میان نتایج حاصل از حجم حباب‌های ایجادشده، سرعت ترمینال، نحوه تغییر شکل حباب‌ها و فرکانس طبیعی تولید حباب‌ها بررسی و مقایسه گردیده است. نشان داده شده است که با افزایش اندازه حباب فرکانس طبیعی کاهش یافته است. همچنین واردکردن تراکم‌پذیری به مدل و همچنین برداشت داده‌ها در محل تولید حباب، سبب ایجاد تصویر دقیق‌تری از نمایش نوسانات شده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Frequency Analysis and Parametric Estimation of Bubble Formation in Vertical Column

نویسندگان [English]

  • Ehsan Habibi Siyahpoosha 1
  • Mohammad Reza ansari 2
1 Faculty of Mechanical Engineering, Tehran, Tarbiat Modares University
2 Faculty of Mechanical Engineering
چکیده [English]

Frequency analysis is one of the most important methods to estimate parameters of bubble formation in a vertical liquid column. In the present article, the frequency of bubble formation was analysed. Three-dimensional transient two-phase flow was simulated based on the volume of fluid method. Hybrid Reynolds averaged Navier-Stokes/large eddy simulation turbulence methods were used to improve the ability of computational fluid dynamics to capture formation of bubble in the vertical column. The model used for frequency response prediction was modified by applying the compressibility effect that improved the results for the acoustic behaviour. Due to the importance of interface tracking for sound sources recognition in addition to the problems which occur during combining with the large eddy simulation model in the simulation, different interface reconstruction methods have been applied and high-resolution interface capturing scheme was selected. The results were verified by theoretical and empirical data. Furthermore, it was presented that the natural frequency of bubble reduced as the size of the bubbles increased. The compressibility effect improved the results more accurately and the model behaviour was acted more physically.

کلیدواژه‌ها [English]

  • Bubble Formation
  • Aerodynamic Noises
  • Natural Frequency of Bubble
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