135 Reber Building
3:35 p.m. - 4:35 p.m.
ME 590 Seminar Speaker Series
Additional Information:
Abstract:
Shock wave / boundary layer interactions (SBLIs) are an important phenomenon in high-speed flow that occur in supersonic and hypersonic aircraft inlets, aircraft control surfaces, missile base flows, nozzles, and rotating machinery. These interactions are often associated with severe boundary layer separation, which is highly unsteady, and exhibits high fluctuating pressure and heat loads. The unsteady motions are characterized by a wide range of frequencies, including low-frequency motions that are about two orders of magnitude lower than the integral-scale fluctuations in the upstream boundary layer. The low-frequency motions are particularly problematic for aircraft structures as they can excite high-amplitude vibration of thin panels, which can lead to fatigue and failure. In this seminar, we will discuss some recent experimental research on SBLIs induced by compression ramps where we (i) explore the physics that drive the low-frequency unsteadiness, and (ii) investigate how the low-frequency forcing by an SBLI drives the flow-structure interaction (FSI) of thin panels. The discussion will focus on the physics of SBLI unsteadiness and FSI derived from high-speed pressure-sensitive paint, high-speed particle image velocimetry, and digital image correlation.
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