تقرير
Linear and Nonlinear Disturbance Evolution on the Frustum of Hypersonic Ogive-Cylinders
| العنوان: | Linear and Nonlinear Disturbance Evolution on the Frustum of Hypersonic Ogive-Cylinders |
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| المؤلفون: | Goparaju, Hemanth, Kanawade, Kunal, Unnikrishnan, S, Gaitonde, Datta V |
| سنة النشر: | 2022 |
| المجموعة: | Physics (Other) |
| مصطلحات موضوعية: | Physics - Fluid Dynamics |
| الوصف: | Aspects of transition mechanisms on a $14^{\circ}$ sharp-nosed ogive-cylinder at Mach~$6$ are elucidated by considering linear and nonlinear disturbance evolution of freestream stochastic and wave packet forcing at different locations downstream of the ogive-cylinder junction. The spectral response of the stochastic forcing displays favorable agreement with experimental observations from AFRL on which the configuration is based. Intermittent wave packets are generated from small-amplitude continuous freestream pressure forcing. Linear wave packet evolution reveals that Mack modes are the dominant primary instabilities, followed by relatively weaker first-mode waves. The non-linear wavepacket displays a three-legged wall pressure perturbation signature, which is traced to spanwise curvature effects, and fundamental resonance is the dominant secondary instability mechanism. At higher amplitudes of excitation, weak signatures of sub-harmonic and oblique resonance phenomena are identified. Downstream placement of the small-amplitude disturbance diminishes receptivity of first-mode waves; however, with high-amplitude forcing, the location of actuation does not significantly vary the disturbance evolution signature or the secondary instability mechanisms. Comment: Under review in AIAA Journal |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2210.05069 |
| رقم الأكسشن: | edsarx.2210.05069 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |