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2018 | Buch

Introduction Kapitel lesen Erstes Kapitel lesen

Investigation of Correction Methods for Interference Effects in Open-Jet Wind Tunnels

verfasst von: Oliver Fischer

Verlag: Springer Fachmedien Wiesbaden

Buchreihe : Wissenschaftliche Reihe Fahrzeugtechnik Universität Stuttgart

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik"

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Über dieses Buch

Oliver Fischer analyzes the interference effects occurring in free-stream wind tunnels as well as their correction and simulation. With this work, the investigated correction method and the comparability of its results as well as flow simulation results are improved. The model wind tunnel of the IVK, University of Stuttgart, is simulated in various wind tunnel configurations. The application of a correction procedure to the corresponding experimental data from the model wind tunnel of the IVK is examined. These correction results are directly comparable with interference-free simulation results and thus allow a conclusion on the functionality of the correction method. Based on these findings, this thesis proposes a modification of the correction method that improves the comparability of corrected experimental results and CFD simulations in idealized test conditions.
About the Author
Oliver Fischer works as an engineer in aerodynamics development for a renowned German automobile manufacturer.

Inhaltsverzeichnis

Frontmatter
Chapter 1. Introduction
Abstract
The influence of aerodynamics on several vehicle functions, such as vehicle performance, fuel consumption, stability, thermal management, comfort, and safety, shows the interdisciplinary character of vehicle aerodynamics in the vehicle development process. The importance of aerodynamics has even increased lately, due to stricter legislation concerning fuel consumption and emissions.
Oliver Fischer
Chapter 2. Aerodynamic Development Tools
Abstract
In general, three methods are used today in the aerodynamic development of vehicles in the automotive industry. The dominating method is the aerodynamic measurement in a wind tunnel. Second is the road experiment method, which is used infrequently, as compared to the wind tunnel. CFD is the third method.
Oliver Fischer
Chapter 3. Wind Tunnel Interference Effects
Abstract
Wind tunnels attempt to simulate the flow around a test object, which is located within an infinite stream. Primarily due to limited financial resources, the cross-section of the nozzle and the size of the test section are limited. The proximity of the surrounding wind tunnel geometry leads to a different flow field around the test object than within an infinite stream.
Oliver Fischer
Chapter 4. Correction Method for Interference Effects in Open-Jet Wind Tunnels
Abstract
In contrast to wind tunnel corrections in closed-wall wind tunnels, the necessity of corrections of open-jet wind tunnel measurements for automotive applications has been a topic of discussion as they are significantly smaller [4].
Oliver Fischer
Chapter 5. Computational Fluid Dynamics Investigations
Abstract
In this thesis, CFD simulations were used to investigate the blockage effects in an open-jet test section, which significantly change the flow field and, thus, the acting forces on the vehicle. Hence, it is the goal to gain deeper insight into single interference effects and, finally, to gain deeper understanding into the physics behind the empirical correction method for open-jet interference effects. The main focus is on the horizontal buoyancy effect, which is the strongest of all open-jet interference effects in most known open-jet wind tunnels.
Oliver Fischer
Chapter 6. Application and Investigation of the Correction Method
Abstract
Within the aerodynamic community today, it is still discussed whether measurements in open-jet wind tunnels need to be corrected due to open-jet interference effects caused by the limited extent of the test section and the jet. Existing correction methods are still not applied in most open-jet wind tunnels to increase comparability. In this section, the correction method, as described in Chapter 4, is applied to measurements from different wind tunnels to show the usability and robustness of the method.
Oliver Fischer
Chapter 7. Comparison of Results
Abstract
In this section, the results of CFD simulations and the corrected experimental results are compared, and the final conclusions of the investigation are derived. In addition, offered are recommendations for future research, which evolved from the performed experiments and simulations.
Oliver Fischer
Backmatter
Metadaten
Titel
Investigation of Correction Methods for Interference Effects in Open-Jet Wind Tunnels
verfasst von
Oliver Fischer
Copyright-Jahr
2018
Electronic ISBN
978-3-658-21379-4
Print ISBN
978-3-658-21378-7
DOI
https://doi.org/10.1007/978-3-658-21379-4

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