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An Experimental Investigation Into The Wake Vortex Roll Up Of A Rectangular Airfoil
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Book Synopsis An Experimental Investigation Into the Wake Vortex Roll-up of a Rectangular Airfoil by : Robert Lindsey Bristol
Download or read book An Experimental Investigation Into the Wake Vortex Roll-up of a Rectangular Airfoil written by Robert Lindsey Bristol and published by . This book was released on 1999 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of the Trailing Vortex Wake of Rectangular Airfoils by : Jamey Darin Jacob
Download or read book Experimental Investigation of the Trailing Vortex Wake of Rectangular Airfoils written by Jamey Darin Jacob and published by . This book was released on 1995 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of Vortex Roll-up for an Elliptically-loaded Wing by : José Carlos Quadrelli
Download or read book An Experimental Investigation of Vortex Roll-up for an Elliptically-loaded Wing written by José Carlos Quadrelli and published by . This book was released on 1985 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aircraft Wake Vortices Characterization and Alleviation by : Omer Ali El-Sayed
Download or read book Aircraft Wake Vortices Characterization and Alleviation written by Omer Ali El-Sayed and published by . This book was released on 2010 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: The serious impact of the trailing vortices from large aircraft is well known. Many examples exist of the damage caused to following aircraft caught up in the swirling wake shed from an upstream aircraft. Motivation behind the present investigation is the alleviation of the rolling moment induced on the following aircraft by means of a differential spoiler setting DSS's. An experimental investigation on a wing tip vortex generated by generic aircraft model, Subsonic Wall Interference Model (SWIM) in plain and flapped wing configurations was conducted in a low speed wind tunnel at Korean Aerospace Research Institute (KARI). Particle image velocimetry was used to characterize wing tip vortex structures as well as to distinguish and quantify vortex meandering and further remove its effects. In subsequent experiments investigation on wake vortices has been carried out in the international Islamic University Malaysia (IIUM) low speed wind tunnel for the evaluation of differential spoiler settings (DSS) capabilities in modifying the span-wise wing load and further reduces the wake vortex hazard. Advanced PIV technique was used to measure the wake velocities at four cross-section planes down-stream of the aircraft half model in the near and extended near wake field. Model was investigated at high lift configuration as well as at four DSS configurations believed to modify the span-wise wing loading (two inboard and two outboard loading cases). Results reveal a noticeable inboard shift of wing loading along with the direct interaction of the spoiler's wake and flap tip vortex for the inboard loading cases. Implementation of DSS results in a substantial redistribution of the flap tip vortex circulation with a diameter of the merged vortex increased by a factor of up to 2.72 times, relative to the undisturbed flap tip vortex. Inspection of the cross-stream distribution of axial vorticity shows up to 2.33 times reduction in the peak vorticity value. A 44% decrease of the maximum cross-flow velocity was recorded for the case of deployed spoilers relative to undisturbed flap tip vortex maximum cross-flow velocity. The wing tip vortex experiences the effect of wing load modification but doesn't show appreciable difference, both in terms of cross-flow velocity and local circulation distribution. Evaluations of the outboard loading results indicate a limited diffusion experienced by the vortex due to the increased level of turbulence. Influence of DSS's on the wake vortex structure emphasizes that separation distance (spoiler wake/wing-flap tips vortices) plays an important role in the favorable interaction expected. Finally assessment of the DSS's capabilities as a wake vortex attenuation device reveals, while position of the maximum induced rolling moments in the flap tip area is little influenced by the DSS's, the maximum induced rolling moment coefficient was reduced to a nearly one third relative to the undisturbed flap tip vortex value.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vortex Wake Rollup and Vorticity Concentration Behind an Airfoil by : Thomas Arthur McMahon
Download or read book Vortex Wake Rollup and Vorticity Concentration Behind an Airfoil written by Thomas Arthur McMahon and published by . This book was released on 1967 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Some experimental evidence seems to confirm that the near wake problem is basically three-dimensional and should be reexamined as such. A concentration mechanism based on this three-dimensionality is proposed and found to predict a gradient of core circulation which is dimensionally correct and gives realistic answers when specific numerical cases are compared to published experiments. The correlation of experiment with theory involves a uniform translation of the theoretical points a specific distance upstream, implying that rotational fluid in the sheet requires a finite, uniform time to get to the core, no matter which downstream station is considered. A paradox in the role of viscosity in the concentrating mechanism is discussed. (Author).
Book Synopsis Vortex Wake and Exhaust Plume Interaction, Including Ground Effect by : Ihab Gaber Adam
Download or read book Vortex Wake and Exhaust Plume Interaction, Including Ground Effect written by Ihab Gaber Adam and published by . This book was released on 1998 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Airfoil Boundary Layer and Turbulent Wake Development at Low Reynolds Numbers by : Serhiy Yarusevych
Download or read book Investigation of Airfoil Boundary Layer and Turbulent Wake Development at Low Reynolds Numbers written by Serhiy Yarusevych and published by . This book was released on 2006 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boundary layer and wake development on a NACA 0025 airfoil at low Reynolds numbers was studied experimentally via surface pressure measurements, hot-wire velocity measurements, and flow visualization. Wind tunnel experiments were carried out for a range of Reynolds numbers and three angles of attack. In addition, flow control with periodic excitations was investigated and a shear layer stability analysis was performed. Two boundary layer flow regimes were identified: (1) boundary layer separation without reattachment and (2) separation bubble formation. The results have demonstrated that transition to turbulence, which occurs due to the amplification of disturbances in the separated shear layer, plays a key role in boundary layer reattachment. Once disturbances reach sufficient amplitude, shear layer roll-up occurs and the resulting vortices are shed at a fundamental frequency. The roll-up process is attributed to the Kelvin-Helmholtz instability, and the salient characteristics of the roll-up vortices can be adequately estimated by means of inviscid linear stability analysis. The final stage of transition is associated with the growth of a sub-harmonic component in the velocity spectrum, which can be attributed to the merging of the roll-up vortices. Wake vortices form in the near-wake region and are shed alternatively on the upper and lower sides of the turbulent wake. Each of the two identified flow regimes is associated with distinctly different characteristics of both the roll-up and wake vortices. It has been established that the fundamental frequency of the shear-layer disturbances exhibits a power law dependency on the Reynolds number, whereas the wake vortex shedding frequency displays a linear dependency on the Reynolds number. A universal scaling for the wake vortex shedding frequency has been determined, which has a universal Strouhal number of 0.17. The results provide added insight into flow control with external acoustic excitation. It is concluded that matching the excitation frequency with the frequency of the most amplified disturbance in the separated shear layer is the optimum method for controlling airfoil performance. Two threshold levels for excitation amplitude have been identified: (i) a minimum effective amplitude that is linked to the background noise level and (ii) a maximum efficient amplitude.
Book Synopsis Review of the Vortex Wake Rollup Problem by : Thomas Arthur McMahon
Download or read book Review of the Vortex Wake Rollup Problem written by Thomas Arthur McMahon and published by . This book was released on 1967 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The near wake problem behind an airfoil is reviewed in the context of some eighteen references, both theoretical and experimental. It is found that the body of theoretical literature makes an inconsistent approximation about the axial component of velocity in the flow. The techniques of selfsimilar hydrodynamics, vortex system theory, and conservation of energy arguments as they apply to the roll-up problem are discussed. Some important experimental evidence seems to confirm that the near wake problem is basically three-dimensional and should be reexamined as such. A paradox in the role of viscosity in the concentrating mechanism is discussed. (Author).
Book Synopsis Experimental Investigation of the Perpendicular Vortex-airfoil Interaction at Transonic Speeds by : Iraj Masbooghi Kalkhoran
Download or read book Experimental Investigation of the Perpendicular Vortex-airfoil Interaction at Transonic Speeds written by Iraj Masbooghi Kalkhoran and published by . This book was released on 1987 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA SP. written by and published by . This book was released on 1992 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of the Perpendicular Vortex-airfoil Interaction at Transonic Speeds by : Iraj M. Kalkhoran
Download or read book An Experimental Investigation of the Perpendicular Vortex-airfoil Interaction at Transonic Speeds written by Iraj M. Kalkhoran and published by . This book was released on 1987 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wake Bursting: a Computational and Experimental Investigation for Application to High-lift Multielement Airfoil Design by : Brent William Pomeroy
Download or read book Wake Bursting: a Computational and Experimental Investigation for Application to High-lift Multielement Airfoil Design written by Brent William Pomeroy and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluid Vortices written by Sheldon Green and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 905 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Experimental Study of Complex Vortex Interactions in the Wake of High Aspect Ratio Wings by : J. D. Jacob
Download or read book Experimental Study of Complex Vortex Interactions in the Wake of High Aspect Ratio Wings written by J. D. Jacob and published by . This book was released on 1997 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of the Parallel Vortex-airfoil Interaction at Transonic Speeds by : Iraj M. Kalkhoran
Download or read book An Experimental Investigation of the Parallel Vortex-airfoil Interaction at Transonic Speeds written by Iraj M. Kalkhoran and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
