Analysis and Uncertainty Quantification of a Hybrid Laminar Flow Control System

This study aims to quantify suction velocities for hybrid laminar flow control of a vertical fin by taking data and model uncertainties into account. Because suction velocities cannot be measured directly, they are calculated using the Darcy–Forchheimer model, which needs the pressure distribution a...

Full description

Saved in:
Bibliographic Details
Published in:AIAA journal 2022-10, Vol.60 (10), p.5735-5749
Main Authors: Barklage, Alexander, Römer, Ulrich, Bertram, Anna, Bekemeyer, Philipp, Himisch, Jan, Radespiel, Rolf, Badrya, Camli
Format: Article
Language:English
Subjects:
Boundary layer control
Data integration
Flow control
Hybrid systems
Laminar boundary layer
Laminar flow
Porosity
Pressure distribution
Representations
Suction
Uncertainty
Wind tunnels
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This study aims to quantify suction velocities for hybrid laminar flow control of a vertical fin by taking data and model uncertainties into account. Because suction velocities cannot be measured directly, they are calculated using the Darcy–Forchheimer model, which needs the pressure distribution and porosity characteristics as input. Uncertainties in the pressure distribution are characterized using a novel data fusion method incorporating wind-tunnel and numerical data. Furthermore, geometrical uncertainties of the airfoil that alter the pressure distribution are considered. Two methods are proposed to model the porosity characteristics of the surface: one of which uses a local representation, and the other a global representation. In addition, the modeling error of the Darcy–Forchheimer model is estimated. These input uncertainties are quantified and propagated by Monte Carlo sampling through the Darcy–Forchheimer model. It reveals that local information on the porosity characteristics is essential for accurate suction velocity estimates for this specific application. A sensitivity study shows that the most influential contribution to the variance of suction velocities is the uncertainty in the porosity characteristics, followed by uncertainties in the pressure distribution. The model error and uncertainties in the reference pressure are shown to have a negligible influence.
ISSN:0001-1452
1533-385X
DOI:10.2514/1.J061745