کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7051485 | 1457378 | 2018 | 23 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The influence of ventilated cavitation on vortex shedding behind a bluff body
ترجمه فارسی عنوان
نفوذ کاویتاسیون تهویه ای بر گرد و غبار ریختن در پشت بدن بی نظیر
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کلمات کلیدی
جریان کاویتی تخلیه شده، دوربین با سرعت بالا، سرعت سنجی تصاویر ذرات، تجزیه مناسب متعادل، ریختن وورث،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
The objective of this paper is to investigate the influence of ventilated cavitation on vortex shedding in the wake behind a bluff body at Reâ¯=â¯6.7â¯Ãâ¯104 combining high-speed camera and TR-PIV measurement with POD analysis. The results show that three different vortex shedding behaviors exist in the wake. With the increase of gas entrainment coefficient Qv, the ventilated cavity area increases, while the corresponding frequency decreases. The proper orthogonal decomposition (POD) analysis, containing the variations of the POD mode energy, POD coefficients, and POD modes, is used to reveal the influence of ventilated cavitation on the vortex shedding behavior. The results demonstrate that ventilated cavitation affects vortex shedding in both time and spatial scales. In terms of time scales, the frequency of the first two modes reduces with the increase of Qv, which is consistent with the ventilated cavitation vortex shedding frequency obtained by high-speed image processing. In terms of spatial scales, the energy of large-scale structures decreases with the increase of Qv, while the energy of relative small-scale structures increases. Based on the reconstruction by linear combination of the first four POD modes and the mean flow field, we obtain the dominant flow features and the influence of ventilated cavitation on the vortex-shedding process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental Thermal and Fluid Science - Volume 98, November 2018, Pages 181-194
Journal: Experimental Thermal and Fluid Science - Volume 98, November 2018, Pages 181-194
نویسندگان
Zhiying Wang, Mindi Zhang, Decai Kong, Biao Huang, Guoyu Wang, Chenxi Wang,