Experimental characterization of shock-separation interaction over wavy-shaped geometries through feature analysis
arXiv:2409.15836 · doi:10.1016/j.expthermflusci.2023.111021
Abstract
A canonical wavy surface exposed to a Mach 2 flow is investigated through high-frequency Pressure Sensitive Paint (PSP), Kulite measurements, and shadowgraph imaging. The wavy surface features a compression and expansion region, two shock-boundary layer interactions, and two shock-separation regions. The unsteady characteristics of the wall pressure and shock angles are presented, demonstrating an increase in amplitude of the instabilities when traveling through the shock systems. Three-dimensional flow features, observed in PSP data, reveal a two-dimensional flow pattern. Higher-Order Dynamic Mode Decomposition and Spectral Proper Orthogonal Decomposition are implemented to dissect the different flow features, revealing several dominant low-frequency and medium-frequency phenomena. The separation region appears at frequencies with Strouhal numbers between 0.01 and 0.2, confirmed by the frequency content in the local pressure measurement using Kulites.
References in corpus (4)
- Spectral proper orthogonal decomposition and its relationship to dynamic mode decomposition and resolvent analysis
- Data-driven modal decomposition methods as feature detection techniques for flow problems: a critical assessment
- Low-frequency unsteadiness mechanisms in shock wave/turbulent boundary layer interactions over a backward-facing step
- Unsteadiness of Shock-Boundary Layer Interactions in a Mach 2.0 Supersonic Turbine Cascade