کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7052594 | 1457425 | 2013 | 19 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Proper orthogonal decomposition analysis of the flow field in a plane jet
ترجمه فارسی عنوان
تجزیه مناسب تجزیه میدان مغناطیسی جریان جت در یک جت هواپیما
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
An experimental study was performed for the developing structural characteristics of a plane jet at Re = 3000. The velocity field measurements were made using particle image velocimetry (PIV) in a water jet facility. The proper orthogonal decomposition (POD) method was applied to the two-dimensional PIV data to reveal large-scale vortical structures in the jet flow. The symmetrical counter-rotating vortices that have been discussed in previous jet studies were confirmed in the initial region. It was found that these vortices were generated as a result of the first vortex merging at the subharmonic sideband frequency, (fo±fc)/2, where fo was the initial jet shear instability frequency and fc was the jet column frequency. Moving downstream, their characteristic frequency evolved into fo/2-3fc/4 through nonlinear interaction. In the interaction region, symmetrical vortices were gradually displaced with each other in the streamwise direction and antisymmetrical vortices were eventually formed. The negative correlation between streamwise velocity fluctuations at two points on opposite sides of the jet centreline was caused by the passage of vortical structures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental Thermal and Fluid Science - Volume 51, November 2013, Pages 37-55
Journal: Experimental Thermal and Fluid Science - Volume 51, November 2013, Pages 37-55
نویسندگان
Y.M. Shim, R.N. Sharma, P.J. Richards,