Download or read book Boundary layer Studies on Spinning Bodies of Revolution written by Walter B. Sturek and published by . This book was released on 1974 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation of the effects of spin induced distortion of the boundary-layer on a spinning cone and tangent-ogive-cylinder model for small angle of attack at Mach 2, 3 and 4 is reported. The profile of the location of boundary-layer transition has been determined completely about the surface of the models from spark shadowgraphs. These spark shadowgraphs were taken with the model mounted on an offset strut which was rolled incrementally in azimuth to reveal the entire surface of the model. Strain gage balance measurements of Magnus and normal force were made for three significantly different boundary-layer configurations--predominately laminar, predominately turbulent, tripped to turbulent--and confirm the pronounced sensitivity of Magnus to boundary-layer configuration. (Author).
Download or read book The Laminar Boundary Layer on Spinning Bodies of Revolution written by Ralph John Muraca and published by . This book was released on 1970 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Boundary Layer Studies on a Spinning Tangent oglive cylinder Model written by Walter B. Sturek and published by . This book was released on 1975 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation of the Magnus effect on a seven caliber tangent-ogive-cylinder model in supersonic flow is reported. The effects of surface spin, angle of attack and Mach number on boundary-layer transition have been studied using spark shadowgraphs of the flow. These shadowgraphs were taken while the model was mounted on offset struts to enable views to be obtained of the flow completely about the circumference of the model. The Magnus and normal forces were measured using the strain-gage balance technique for different boundary layer configurations. These measurements revealed a substantial sensitivity of Magnus force to the boundary layer configuration. A preliminary comparison of the Magnus measurements to the theory of Vaughn and Reis yielded poor agreement. The data have been tabulated to facilitate their use in the evaluation of proposed theoretical models of the Magnus effect.
Download or read book Effect of Spin and Yaw on Boundary Layer Transition Along a Body of Revolution written by Alvin L. Fehrman and published by . This book was released on 1955 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Preliminary Surveys of the Three Dimensional Boundary Layer on a Yawed Spinning Body of Revolution written by Walter B. Sturek and published by . This book was released on 1975 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental measurements of the three dimensional boundary layer on a yawed, spinning tangent-ogive-cylinder model in supersonic flow are reported. The measurements were made using a flattened total head probe at one axial station near the base of the model for 10 azimuthal stations about the circumference. The test conditions were: M = 3, angle of attack = 4 deg, omega = 0 and 10,000 RPM. The trends observed in comparing measurements with and without the model spinning were: (1) the boundary layer is more thick and less full where surface spin opposes the crossflow velocity; and (2) the boundary layer is less thick and more full where surface spin is in the same direction as the crossflow velocity. (Author).
Download or read book Boundary Layer Development on Rotating Bodies of Revolution written by L. Lambropoulos and published by . This book was released on 1983 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are many practical cases in turbomachines where the behavior of the three-dimensional axisymetric rotating boundary layers must be known. In this work the authors analyse existing experimental data concerning such rotating viscous flows. It is demonstrated how one may describe such cases in the rotational frame of reference, using simple boundary layer notions. Boundary layer calculations are then performed in order to predict these flows. The theoretical and experimental results are found to be in a very good agreement. (Author).
Download or read book Boundary Layer Studies on a Spinning Cone written by Walter B. Sturek and published by . This book was released on 1973 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation of the effects of spin induced distortion of the boundary layer on a spinning 10 degree half angle cone at Mach 2, 3 and 4 is reported. The profile of the location of boundary layer transition has been determined completely about the surface of the cone model from spark shadowgraphs. These spark shadowgraphs were taken with the model mounted on an offset strut which was rolled incrementally in azimuth to reveal the entire surface of the model. The profile of the boundary layer thickness at the base of the cone has also been determined from the spark shadowgraphs. Strain gage balance measurements of Magnus and normal force were made for three significantly different boundary layer configurations and confirm the extreme sensitivity of Magnus to boundary layer configuration.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1972 with total page 1070 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book STAR written by and published by . This book was released on 1973 with total page 904 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Three Dimensional Boundary Layer Research as Applied to the Magnus Effect on Spinning Projectiles written by Walter B. Sturek and published by . This book was released on 1975 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to Army interest in predicting Magnus effects on artillery projectiles, the Ballistic Research Laboratories are carrying out experimental and theoretical research studies of the boundary layer on yawed, spinning bodies of revolution in supersonic flow. In this paper, computed results are shown for circumferential velocity profiles and boundary layer displacement thickness for the laminar boundary layer on a yawed, spinning cone. A comparison between computed values and experimental strain gage balance measurements of Magnus force is shown to yield encouraging agreement. Surveys of the boundary layer on a yawed, spinning tangent-ogive-cylinder model have been made at azimuthal stations completely about the circumference of the model. Measurements have also been made of wall static pressure on a yawed body of revolution. Examples of these data are discussed. (Author).
Download or read book The Effect of Base Bleed on the Drag and Magnus Characteristics of a Rotating Body of Revolution written by Frank J. Regan and published by . This book was released on 1972 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Base bleed is a technique whereby all or part of the boundary layer is 'bled' from the rear portion of a projectile to the base region. Passage from the model's surface to the base region is by means of concentric cylindrical passageways. The purpose of base bleed is to reduce the Magnus moment on overlong spinning bodies of revolution and to reduce the base drag. Both analytic and experimental results are presented. The boundary layer is represented by means of the momentum thickness.
Download or read book Computations of Turbulent Boundary Layer Development Over a Yawed Spinning Body of Revolution with Application to the Magnus Effect written by Walter B. Sturek and published by . This book was released on 1977 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many projectiles are slender bodies of revolution which are launched at high spin rates. Magnus forces and moments are generated by the distorted boundary layer which results from a spinning body at angle yaw. The Ballistic Research laboratory is conducting and supporting theoretical and experimental Magnus research efforts. The theoretical effort involves: (1) numerical calculation of the fully three-dimensional boundary layer with the added complication of interaction between surface spin and cross flow velocity; (2) three-dimensional inviscid flow calculations over a body plus boundary layer displacement surface with no plane of symmetry. Several types of experimental data, such as surface pressures, Magnus forces, boundary layer surveys, flow visualization, and skin friction, were obtained to evaluate and provide guidance to the theoretical effort. Comparison of the theory to experimental data shows the agreement to be very good. (Author).
Download or read book Boundary Layer Over Spinning Blunt Body of Revolution at Incidence and Magnus Forces written by K. C. Wang and published by . This book was released on 1977 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: An incompressible laminar flow over a spinning blunt-body at incidence is investigated. The approach follows strictly the three-dimensional boundary layer theory, and the lack of initial profiles is readily resolved. The rule of the dependence zone is satisfied with the Krause scheme and complete numerical solutions are obtained for an ellipsoid of revolution at 6 deg incidences and two different spin rates. Spinning causes asymmetry which, in turn, introduces the Magnus force. The asymmetry is most pronounced in crossflow, but is also noticeable in the skin-friction and displacement thickness of the meridional flow. A variety of crossflow profiles are determined as are the streamline patterns in the cross- and meridional-planes which are especially useful in visualizing the flow structure. The Magnus forces due to the crossflow skin friction and the centrifugal pressure are determined; these two forces partly compensate each other. At lower spin rage, the frictional force is larger, resulting in a positive Magnus force. At high spin rate, the opposite is obtained. At high incidence (30 deg), the leeside separated region associated with an open separation is found not amenable to a classical boundary layer treatment. The present boundary layer calculations could be carried out, in the longitudinal direction, only up to the beginning of an open separation. Since an open separation moves forward with increasing incidence, the calculable area, therefore, decreases.
Download or read book Subject Index to Unclassified ASTIA Documents written by Defense Documentation Center (U.S.) and published by . This book was released on 1960 with total page 308 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 1974 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Boundary Layer Over Spinning Blunt Body of Revolution at Incidence Including Magnus Forces written by K. C. Wang and published by . This book was released on 1977 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: An incompressible laminar flow over a spinning blunt-body at incidence is investigated. The approach follows strictly the three-dimensional boundary layer theory, and the lack of initial profiles is readily resolved. The rule of the dependence zone is satisfied with the Krause scheme and complete numerical solutions are obtained for an ellipsoid of revolution at 6 deg incidences and two different spin rates. Spinning causes asymmetry which, in turn, introduces the Magnus force. The asymmetry is most pronounced in crossflow, but is also noticeable in the skin-friction and displacement thickness of the meridional flow. A variety of crossflow profiles are determined as are the streamline patterns in the cross- and meridional-planes which are especially useful in visualizing the flow structure. Detailed distribution of skin frictions, displacement thicknesses, and centrifugal pressure are presented. A new derivation of the total displacement thickness is given and a negative displacement thickness is found physically meaningful. The Magnus forces due to the crossflow skin friction and the centrifugal pressure are determined; these two forces partly compensate each other. At lower spin rate, the frictional force is larger, resulting in a positive Magnus force. At high spin rate, the opposite is obtained. At high incidence (30 deg), the leeside separated region associated with an open separation is found not amenable to a classical boundary layer treatment. The present boundary layer calculations could be carried out, in the longitudinal direction, only up to the beginning of an open separation. Since an open separation moves forward with increasing incidence, the calculable area, therefore, decreases. (Author).
Download or read book Hydraulic Research in the United States and Canada written by United States. National Bureau of Standards and published by . This book was released on 1978 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
