کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7153920 1462494 2017 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Self-sustained oscillation for compressible cylindrical cavity flows
ترجمه فارسی عنوان
نوسانات خود پایدار برای جریان حفره استوانه ای فشرده
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی هوافضا
چکیده انگلیسی
The presence of a cavity changes the mean and fluctuating pressure distributions. Similarities are observed between a cylindrical cavity and a rectangular cavity for a compressible flow. The type of cavity flow field depends on the diameter-to-depth ratio and the length-to-depth ratio. The feedback loop is responsible for the generation of discrete acoustic tones. In this study, the self-sustained oscillation for a compressible cylindrical cavity flow was investigated experimentally. For open-type cavities, the power spectra show that the strength of resonance depends on the diameter-to-depth ratio (4.43-43.0) and the incoming boundary layer thickness-to-depth ratio (0.72-7.0). The effective streamwise length is used as the characteristic length to estimate the Strouhal number. At higher modes, there is a large deviation from Rossiter's formula for rectangular cavities. The gradient-based searching method was used to evaluate the values of the empirical parameters. Less phase lag and a lower convection velocity are observed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chinese Journal of Aeronautics - Volume 30, Issue 4, August 2017, Pages 1294-1299
نویسندگان
, , ,