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"Aerodynamics"
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The cover image is based on the Original Article Aerodynamics of an airfoil with leading‐edge icing by R. Jason Hearst and Magnus Vinnes, https://doi.org/10.1002/we.2603.
Journal Article
Understanding aerodynamics : arguing from the real physics
A much-needed, fresh approach that brings a greater insight into the physical understanding of aerodynamics. Based on the author's decades of industrial experience with Boeing, this book helps students and practising engineers to gain a greater physical understanding of aerodynamics.
Book
Review of research on high-speed railway aerodynamics in China
High-speed railway aerodynamics is the key basic science for solving the bottleneck problem of high-speed railway development. This paper systematically summarizes the aerodynamic research relating to China’s high-speed railway network. Seven key research advances are comprehensively discussed, including train aerodynamic drag-reduction technology, train aerodynamic noise-reduction technology, train ventilation technology, train crossing aerodynamics, train/tunnel aerodynamics, train/climate environment aerodynamics, and train/human body aerodynamics. Seven types of railway aerodynamic test platform built by Central South University are introduced. Five major systems for a high-speed railway network—the aerodynamics theoretical system, the aerodynamic shape (train, tunnel, and so on) design system, the aerodynamics evaluation system, the 3D protection system for operational safety of the high-speed railway network, and the high-speed railway aerodynamic test/computation/analysis platform system—are also introduced. Finally, eight future development directions for the field of railway aerodynamics are proposed. For over 30 years, railway aerodynamics has been an important supporting element in the development of China’s high-speed railway network, which has also promoted the development of high-speed railway aerodynamics throughout the world.
Journal Article
Mécanique de vol des aéronefs
Les calculs de performances peuvent être classés en trois principaux types: portance, poussée et pente. Premièrement, le profil de portance étant connu et non modifiable dès la conception de l'aéronef finalisée, il faut déterminer la masse à vitesse donnée ou la vitesse à masse donnée. Deuxièmement, la poussée des moteurs étant connue ainsi que la masse, il faut calculer la pente. Enfin, la pente étant connue (par exemple le vol en palier), ainsi que la masse, il faut déduire la poussée, c'est-à-dire la position de la manette de commande des gaz qui assure l'équilibre, puis définir la consommation correspondante.Les spécifications de performances comme la manoeuvrabilité, la consommation, la maintenance, la sécurité, ou la testabilité des aéronefs des clients sont sans cesse plus exigeantes au fil des générations d'équipement. Elles ont nécessité des avancées techniques majeures: profils d'ailes, motorisations, matériaux pour alléger le poids, etc.Mécanique de vol des aéronefs présenteune approche théorique de la mécanique de vol qui permet d'appréhender le sujet et fait le lien avec l'approche empirique des industriels.
eBook
A Review of Active Aerodynamic Systems for Road Vehicles
Comfort, safety, high travel speeds, and low fuel consumption are expected characteristics of modern cars. Some of these are in conflict with one other. A solution to this conflict may be time-varying body geometry realized by moving aerodynamic elements and appropriate systems for controlling their motion. This paper presents a review of existing technical solutions and the results of published research on the effects of active flow control around a vehicle on its dynamic properties. Active aerodynamic systems typically adjust certain aerodynamic characteristics based on the vehicle speed, but systems using other information such as acceleration, yaw rate, steering angle, and brake pressure, as well as fully automatic systems, are also considered. This review provides information on historical and current methods, models, and their effectiveness in designing vehicle bodies and the movable aerodynamic elements mounted on them. Technical solutions in which the driver is an element of the control system, automatic systems, their models, models of movable aerodynamic elements, and coupled dynamic-aerodynamic models are presented. A number of types of moving aerodynamic element solutions used for different purposes are considered in this paper and conclusions are presented.
Journal Article
Aircraft performance : an engineering approach
\"Flight is the process in which a vehicle moves through the air without any direct mechanical support from the ground. In Physics, science of the action of forces on material bodies is referred to as Mechanics. The science of \"Mechanics\" is basically divided into two branches: 1. Dynamics, and 2. Statics. Branch of mechanics that deals with the motion of objects in relation to force, mass, momentum, and energy is referred to as Dynamics. The topic of flight mechanics (or Flight Dynamics) is to study the motion of flying objects (e.g., aircraft, missile) through air\"-- Provided by publisher.
Book
Unsteady aerodynamic forces on a tapered prism during the combined vibration of VIV and galloping
Pressure measurements for rigid models fail to take aeroelastic effects into account, as well as forced vibration tests only consider the effect of an oscillating model on wind flow and cannot include the feedback from wind flow to the oscillating model. To investigate the characteristics of unsteady aerodynamic forces and predict the aeroelastic response of a tapered prism during VIV–galloping, hybrid aeroelastic-pressure balance (HAPB) wind tunnel tests at different reduced wind velocities were carried out. Unsteady pressures and tip responses of a tapered test model were synchronously observed. Both the aerodynamic and aeroelastic characteristics of the tapered prism during VIV–galloping instability were discussed in terms of aeroelastic response, force spectrum, coherence coefficient and pressure distribution. Subsequently, the VIV–galloping response was predicted by unsteady aerodynamic forces and compared to quasi-static calculations and experimental results. It was found that large-amplitude periodic vibrations took place at approximately twice the onset wind speed of VIV, which was recognized as VIV–galloping. Moreover, structural oscillation would have a significant effect on aerodynamic characteristics in the crosswind direction. In addition, the HAPB test was efficacious in measuring unsteady aerodynamic forces on the test model, which were effective to predict VIV–galloping instability of bluff bodies.
Journal Article