Vortex Flow Behavior Over Slender Delta Wing Configurations - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Vortex Flow Behavior Over Slender Delta Wing Configurations write by Xing Z. Huang. This book was released on 2008-10-01. Vortex Flow Behavior Over Slender Delta Wing Configurations available in PDF, EPUB and Kindle. The book discusses the behavior of vortices over sharp and highly swept wing configurations used for current and future military aircraft. Special attention is paid to the effects of critical flow phenomenon such as vortex breakdown occuring at high angles of attack or high angular rates. The wind tunnel experiments conducted on delta-wing configurations in wind tunnels in Canada, Europe, Russia and the United States are given in eight chapters. The experiments provide an extended data base that gives insight into the effects of the angle of attack, angular rate, Reynolds number and Mach number on the behavior of vortices over several slender delta wings in stationary and instationary flights. A critical assessment is given in a separated chapter of the available experimental data bases and out of these data, one and the same data set is selected for the validation and verification of analytical and numerical solutions.Comprehansive computational results are given in another ten chapters. Steady-state and time-accurate solutions for the steady and unsteady flow over the selected delta-wing configuration are discussed. These solutions are generated using structured and unstructured grid methods.The analytical solutions for the flow over a delta wing are discussed and compared with experimental data in three more chapters.In the final chapter a validation and verification of the analytical and CFD solutions is given.
An Experimental Investigation of Aerodynamics and Flow Characteristics of Slender and Nonslender Delta Wings
An Experimental Investigation of Aerodynamics and Flow Characteristics of Slender and Nonslender Delta Wings - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook An Experimental Investigation of Aerodynamics and Flow Characteristics of Slender and Nonslender Delta Wings write by Muneeb Dogar. This book was released on 2013. An Experimental Investigation of Aerodynamics and Flow Characteristics of Slender and Nonslender Delta Wings available in PDF, EPUB and Kindle. "The leading-edge vortical flow structure over a 65 slender (DW65) and a 50 non-slender (DW50) delta wing was investigated at Reynolds number of order 105. Particular emphasis was placed in the variation of vortex flow quantities and critical flow parameters with change in angle of attack and chordwise distance. In addition, the progression of vortex breakdown with angle of attack was documented based on pressure and three-dimensional velocity information. A glimpse of wake-vortex evolution was also discussed. Moreover, aerodynamic lift and drag forces were evaluated based on wake survey analyses and compared with direct force balance measurements. Special attention was focused on drag characterization based on lift dependency where Maskell formulation was adopted for the estimation of induced drag. The results showed that the flow over DW65 and DW50 has some qualitative resemblances but quantitatively they are two contrasting flows. Prior to the breakdown, in the case of DW65, the vortical flow is near-axisymmetric but in the case of DW50, the vortex and axial core never matches and even the definition of distinctive vortex center is often ambiguous except at higher angles of attack, moreover the axial core was always accompanied by large momentum deficit. The variation of vortex flow quantities in streamwise direction showed self-similar behavior when plotted against radial distance scaled by local semi-span while interestingly for DW50 self-similar behavior was showed only by the variation of total pressure loss about the pressure core. It was established that the flow over DW50 was marred by an active interaction of vortical and boundary layer flow due to the close proximity of vortex to the wing surface. For the first time the progression of vortex breakdown over the wing surface was reported on the basis of three-dimensional flow information which elucidated the respective indicators of breakdown for slender and non-slender delta wings. Lastly, wake survey analyses were carried and comparison of different lift computational models and direct measurement were presented. Moreover, the estimation of profile drag is sensitive to the definition of wake region whereas vortex breakdown upstream of trailing-edge resulted in underestimation and overestimation of induced drag and CL, respectively. For all the cases of slender wing and high angle of attack cases of non-slender delta wing showed that the induced drag always constituted more than 50% of the total drag. The results provided here provided a deepened and extended insight on vortical and aerodynamics characteristics of slender and non-slender delta wing. " --
Motion Effects on Leading-Edge Vortex Behavior Over Delta Wings and Generalized Modeling
Motion Effects on Leading-Edge Vortex Behavior Over Delta Wings and Generalized Modeling - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Motion Effects on Leading-Edge Vortex Behavior Over Delta Wings and Generalized Modeling write by . This book was released on 2003. Motion Effects on Leading-Edge Vortex Behavior Over Delta Wings and Generalized Modeling available in PDF, EPUB and Kindle.
A Study of the Vortex Flow Over 76/40-Deg Double-Delta Wing
A Study of the Vortex Flow Over 76/40-Deg Double-Delta Wing - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook A Study of the Vortex Flow Over 76/40-Deg Double-Delta Wing write by National Aeronautics and Space Adm Nasa. This book was released on 2018-10-22. A Study of the Vortex Flow Over 76/40-Deg Double-Delta Wing available in PDF, EPUB and Kindle. A low-speed wind-tunnel study of the flow about a 76/40-deg double-delta wing is described for angles of attack ranging from -10 to 25 deg and Reynolds numbers ranging from 0.5 to 1.5 Million. The study was conducted to provide data for the purpose of understanding the vortical flow behavior and for validating Computational Fluid Dynamics methods. Flow visualization tests have provided insight into the effect of the angle of attack and Reynolds number of the vortex-dominated flow both on and off of the surface of the double-delta wing. Upper surface pressure recordings from pressure orifices and Pressure Sensitive Paint have provided data on the pressures induced by the vortices. Flowfield surveys were carried out at an angle of attack of 10 deg by using a thin 5-hole probe. Numerical solutions of the compressible thin-layer Navier-Stokes equations were conducted and compared to the experimental data. Verhaagen, N. G. and Jenkins, L. N. and Kern, S. B. and Washburn, A. E. Langley Research Center NAS1-19480; RTOP 505-90-52-01...
Analytical studies of separated vortex flow on highly swept wings
Analytical studies of separated vortex flow on highly swept wings - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Analytical studies of separated vortex flow on highly swept wings write by John M. Kuhlman. This book was released on 1978. Analytical studies of separated vortex flow on highly swept wings available in PDF, EPUB and Kindle.
