کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
650468 | 1457284 | 2013 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Amplitude and phase modulation of cavity modes in a supersonic flow
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Amplitude and phase modulation of cavity modes in a supersonic flow Amplitude and phase modulation of cavity modes in a supersonic flow](/preview/png/650468.png)
چکیده انگلیسی
An experimental study of supersonic flow over a cavity is carried out. The study includes flow visualization and unsteady pressure measurements. From the flow visualization it is observed that the flow field is highly unsteady and that four types of waves are present in the flow field. Spectra of the unsteady pressure data display high amplitude cavity tones. The pressure data is analysed by means of the continuous wavelet transform. Wavelet analysis using the Morlet wavelet function shows that the cavity acoustic modes are both amplitude and phase modulated simultaneously in time. However it is observed that the amplitude of the modulations differs from one cavity mode to the other. The power spectral density of individual time series signals obtained from the wavelet transform indicates that the cavity modes modulate with multiple frequencies rather than at a single frequency. The dominant frequency of amplitude modulation of the cavity modes is the frequency of the dominant cavity mode. The temporal behaviour of phase modulation indicates that there exist non-linear interactions between the cavity modes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Mechanics - B/Fluids - Volume 42, NovemberâDecember 2013, Pages 159-168
Journal: European Journal of Mechanics - B/Fluids - Volume 42, NovemberâDecember 2013, Pages 159-168
نویسندگان
N.S. Vikramaditya, Job Kurian,