Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Lift Distribution And Velocity Field Measurements For A Three Dimensional Steady Blade Vortex Interaction PDF full book. Access full book title Lift Distribution And Velocity Field Measurements For A Three Dimensional Steady Blade Vortex Interaction.
| Author | : |
| Publisher | : |
| Total Pages | : 44 |
| Release | : 1987 |
| Genre | : |
| ISBN | : |
| Author | : Henry E. Jones |
| Publisher | : |
| Total Pages | : 96 |
| Release | : 1997 |
| Genre | : Unsteady flow (Aerodynamics) |
| ISBN | : |
A study of the full-potential modeling of a blade-vortex interaction was made. A primary goal of this study was to investigate the effectiveness of the various methods of modeling the vortex. The model problem restricts the interaction to that of an infinite wing with an infinite line vortex moving parallel to its leading edge. This problem provides a convenient testing ground for the various methods of modeling the vortex while retaining the essential physics of the full three-dimensional interaction. A full-potential algorithm specifically tailored to solve the blade-vortex interaction (BVI) was developed to solve this problem. The basic algorithm was modified to include the effect of a vortex passing near the airfoil. Four different methods of modeling the vortex were used: (1) the angle-of-attack methods, (2) the lifting-surface method, (3) the branch-cut method, and (4) the split-potential method. A side-by-side comparison of the four models was conducted. these comparisons included comparing generated velocity fields, a subcritical interaction, and a critical interaction. The subcritical and critical interactions are compared with experimentally generate results. The split-potential model was used to make a survey of some of the more critical parameters which affect the BVI.
| Author | : |
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| Total Pages | : 226 |
| Release | : 1990 |
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| Author | : Jeffrey S. Marshall |
| Publisher | : |
| Total Pages | : 50 |
| Release | : 1999 |
| Genre | : Fluid dynamics |
| ISBN | : |
An experimental and computational study of the impact of a vortex with a body oriented normal to the vortex axis was performed. Particular focus was placed on understanding characteristics of the secondary vorticity ejected from the body and the interaction of the secondary vorticity with the primary vortex. Since both onset of boundary layer separation and the form of the secondary vorticity structures are sensitive to variation of the velocity normal to the body axis, the effect of normal velocity on vortex-body interaction was carefully examined. The physical features of the flow evolution were categorized in terms of an impact parameter and a thickness parameter, which respectively represent ratios of velocity and length scales associated with the vortex to those associated with the flow in the absence of the vortex. Experiments were performed using a combination of laser-induced fluorescence (LIF) flow visualization and particle-image velocimetry (PIV) in a water tank to examine the form of the secondary vorticity structures with both "high" and "low" values of the impact parameter for normal vortex interaction with a circular cylinder and with a thin blade. A new type of Lagrangian vorticity method based on a tetrahedral mesh was developed and applied to compute the secondary vorticity evolution during vortex-cylinder interaction. Computations were also performed for model problems to examine in detail wrapping of a vortex loop around a columnar vortex and impulsive cutting of a columnar vortex with finite axial flow.
| Author | : Beverley Green |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 916 |
| Release | : 1995-03-31 |
| Genre | : Technology & Engineering |
| ISBN | : 9780792333760 |
Fluid Vortices is a comprehensive, up-to-date, research-level overview covering all salient flows in which fluid vortices play a significant role. The various chapters have been written by specialists from North America, Europe and Asia, making for unsurpassed depth and breadth of coverage. Topics addressed include fundamental vortex flows (mixing layer vortices, vortex rings, wake vortices, vortex stability, etc.), industrial and environmental vortex flows (aero-propulsion system vortices, vortex-structure interaction, atmospheric vortices, computational methods with vortices, etc.), and multiphase vortex flows (free-surface effects, vortex cavitation, and bubble and particle interactions with vortices). The book can also be recommended as an advanced graduate-level supplementary textbook. The first nine chapters of the book are suitable for a one-term course; chapters 10--19 form the basis for a second one-term course.
| Author | : Daniel Bershader |
| Publisher | : |
| Total Pages | : 191 |
| Release | : 1988 |
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The structure of a compressible free vortex has been analyzed while undergoing convection in a quasi-uniform stream flow. Holographic interferograms several reveal radial density profiles of the vortex at different stages of its development during convection. A general mathematical expression is found which closely describes the distribution of density inside the vortex. By use of experimental data and the governing equations in an empirical/theoretical analysis, an extended physical description of the vortex is developed. The time behavior of the density, determined from the experiments, allows the solution of the Continuity Equation and a distribution of the radial component of fluid velocity relative to the vortex center is obtained. The density information, supplemented by an independent determination of pressure is the used in the Radial Momentum Equation to obtain a distribution of the circumferential component of fluid velocity relative to the vortex center, thus completing the description of the radial dependence of the velocities inside the vortex. Furthermore, the calculated velocities are used to evaluate the magnitudes of the convective and diffusive terms of the Angular Momentum Equation, thus providing insight into the question of the relative effects of compressibility and viscosity on the internal structure and behavior of the vortex in terms of the distribution and transport of angular momentum. Keywords: Blade vortex interaction, Rotary wing flight, Rotor wake, Compressible free vortex. (aw).
| Author | : 肖兰 |
| Publisher | : 清华大学出版社有限公司 |
| Total Pages | : 190 |
| Release | : 2005 |
| Genre | : Fluid mechanics |
| ISBN | : 9787302102045 |
| Author | : Earl R. Booth |
| Publisher | : |
| Total Pages | : 32 |
| Release | : 1986 |
| Genre | : Flow visualization |
| ISBN | : |
| Author | : Kyoji Kamemoto |
| Publisher | : World Scientific |
| Total Pages | : 228 |
| Release | : 2000-05-11 |
| Genre | : Technology & Engineering |
| ISBN | : 9814493287 |
Vortex methods have been developed and applied to many kinds of flows related to various problems in wide engineering and scientific fields. The purpose of the First International conference on Vortex methods was to provide an opportunity for engineers and scientists to present their achievements, exchange ideas and discuss new developments in mathematical and physical modeling techniques and engineering applications of vortex methods.
| Author | : Leonard Roberts |
| Publisher | : |
| Total Pages | : 106 |
| Release | : 1985 |
| Genre | : Aerodynamics |
| ISBN | : |
