Academic Journal
An explanation for the phase lag in supersonic jet impingement
| العنوان: | An explanation for the phase lag in supersonic jet impingement |
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| المؤلفون: | Weightman, Joel L., Amili, Omid, Honnery, Damon, Soria, Julio, Edgington-Mitchell, Daniel |
| المصدر: | Journal of Fluid Mechanics ; volume 815 ; ISSN 0022-1120 1469-7645 |
| بيانات النشر: | Cambridge University Press (CUP) |
| سنة النشر: | 2017 |
| الوصف: | For the first time, a physical mechanism is identified to explain the phase lag term in Powell’s impinging feedback loop equation (Powell, J. Acoust. Soc. Am. , vol. 83 (2), 1988, pp. 515–533). Ultra-high-speed schlieren reveals a previously unseen periodic transient shock in the wall jet region of underexpanded impinging flows. The motion of this shock appears to be responsible for the production of the acoustic waves corresponding to the impingement tone. It is suggested that the delay between the inception of the shock and the formation of the acoustic wave explains the phase lag in the aeroacoustic feedback process. This suggestion is quantitatively supported through an assessment of Powell’s feedback equation, using high-resolution particle image velocimetry and acoustic measurements. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1017/jfm.2017.37 |
| الاتاحة: | http://dx.doi.org/10.1017/jfm.2017.37 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022112017000374 |
| Rights: | https://www.cambridge.org/core/terms |
| رقم الانضمام: | edsbas.B4853460 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1017/jfm.2017.37 |
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