In this paper flow over hexagonal patterns has been investigated. Investigations were performed in a subsonic Wind Tunnel. The Motivation behind these tests was to study the effects of the above mentioned hexagonal structures on the Flow of air and their contribution in reducing the Drag of the body. The Cylinders to be investigated were made by bending and welding patterned steel sheets once with facing the patters outwards and second the patterns facing inwards. The Orientation of these patterns towards the free stream of air was also changed during the Investigations and hence the investigations could be performed over five different configurations.
Inhaltsverzeichnis (Table of Contents)
- INTRODUCTION
- EXPERIMENTAL SET-UP
- Results and Discussions
- Drag Coefficient
- Velocity Profiles
Zielsetzung und Themenschwerpunkte (Objectives and Key Themes)
This study investigates the effect of hexagonal patterns on the flow of air over bluff bodies, specifically cylinders. The main objective is to examine the potential for drag reduction by utilizing these patterned surfaces.
- Drag reduction in bluff bodies
- Influence of surface patterns on flow separation
- Aerodynamics of patterned cylinders
- Experimental analysis using Laser-Doppler Anemometry (LDA)
- Comparison of drag coefficients and wake profiles
Zusammenfassung der Kapitel (Chapter Summaries)
- INTRODUCTION: This section introduces the research topic of drag reduction in bluff bodies, highlighting its importance in various industries. It discusses previous studies on drag reduction techniques and the motivation for investigating hexagonal patterns.
- EXPERIMENTAL SET-UP: This chapter details the experimental setup and methodology used in the study. It describes the construction of patterned cylinders, their different orientations, and the subsonic wind tunnel used for testing. It also outlines the measurement techniques employed, including LDA and flow visualization.
- Results and Discussions:
- Drag Coefficient: This subsection presents the results of drag coefficient measurements for different cylinder configurations. It highlights the effect of the patterns on drag reduction, particularly at higher Reynolds numbers.
- Velocity Profiles: This subsection discusses the velocity profiles measured in the wake region of the cylinders. It analyzes the symmetry of the wakes and how they relate to the observed drag reduction.
Schlüsselwörter (Keywords)
The primary focus of this study is on drag reduction, specifically in the context of bluff bodies. The research utilizes patterned surfaces, hexagonal patterns, and Laser-Doppler Anemometry (LDA) as key tools and concepts. The analysis focuses on flow separation, wake characteristics, and the relationship between these aspects and drag coefficients.
- Citation du texte
- Usman Butt (Auteur), 2012, Investigation of Flow over bluff bodies with patterned surface using Laser-Doppler Anemometry, Munich, GRIN Verlag, https://www.grin.com/document/888924
