Description of laminar-turbulent transition of an airfoil boundary layer measured by differential image thermography using directed percolation theory

TL;DR

This paper demonstrates how differential image thermography combined with directed percolation theory can effectively capture and describe the laminar-turbulent transition in an airfoil boundary layer, offering a new high-precision analytical approach.

Contribution

It introduces a novel experimental application of directed percolation theory to boundary layer transition analysis using differential image thermography on an airfoil.

Findings

DIT captures near-surface transition with high resolution

Directed percolation theory accurately describes transition onset

Theory applicable across various flow conditions

Abstract

The study presented here addresses the challenging problem of laminar-turbulent flow transition in boundary layers. Directed percolation theory has emerged as a promising approach to understand and describe this transition in different scenarios. This study utilizes differential image thermography (DIT) to investigate the boundary layer transition on the suction side of a heated airfoil, presenting new experimental findings. First, the DIT results underline the ability of capturing the near surface transition for the airfoil boundary layer with a high temporal and spatial resolution. Second, the evaluation reveals the effectiveness of directed percolation theory in describing the onset of the transition, showing agreement with all three universal exponents of (1+1)D directed percolation theory. Third, the study shows the applicability of this theory to a wide range of flow situations beyond the parameter space covered in previous examinations. These findings underscore the possible application of directed percolation models in fluid mechanics and suggest that the theory could serve as a high precision tool for describing the transition to turbulence.