Experimental characterization of shock-separation interaction over wavy-shaped geometries through feature analysis

TL;DR

This study investigates shock-separation interactions over a wavy surface at Mach 2 using advanced measurement techniques and data analysis, revealing unsteady flow features, dominant frequency phenomena, and flow pattern characteristics.

Contribution

It introduces a comprehensive experimental analysis combining PSP, Kulite, and shadowgraph data with advanced modal decomposition to characterize shock-separation interactions on wavy geometries.

Findings

Unsteady pressure and shock angles increase in amplitude through shock systems.

Flow remains predominantly two-dimensional despite complex surface geometry.

Separation occurs at Strouhal numbers between 0.01 and 0.2.

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.