Download or read book A Study of Turbulent Wakes in Constant Streamwise Pressure Gradients written by Terrance Edwards Anderson and published by . This book was released on 1973 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-dimensional turbulent wakes in constant adverse and favorable pressure gradients were studied experimentally. The static and dynamic pressures through the wake were obtained with calibrated Pradtl-type pitot-static probes, and a computer program was written to extract from these data the velocity profiles, displacement thickness, momentum thickness, and the shape factor. This program further provides the turbulent shear coefficient, eddy viscosity, and Prandtl mixing length within the wake. A wind tunnel was designed specifically for this experiment and its construction details are included. (Modified author abstract).

Download or read book A Study of Turbulent Wakes in Constant Streamwise Pressure Gradients written by and published by . This book was released on 1973 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-dimensional turbulent wakes in constant adverse and favorable pressure gradients were studied experimentally. The static and dynamic pressures through the wake were obtained with calibrated Pradtl-type pitot-static probes, and a computer program was written to extract from these data the velocity profiles, displacement thickness, momentum thickness, and the shape factor. This program further provides the turbulent shear coefficient, eddy viscosity, and Prandtl mixing length within the wake. A wind tunnel was designed specifically for this experiment and its construction details are included. (Modified author abstract).

Download or read book A Study of the Development of Steady and Periodic Unsteady Turbulent Wakes Through Curved Channels at Positive Zero and Negative Streamwise Pressure Gradients Part 1 written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-23 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: The turbomachinery wake flow development is largely influenced by streamline curvature and streamwise pressure gradient. The objective of this investigation is to study the development of the wake under the influence of streamline curvature and streamwise pressure gradient. The experimental investigation is carried out in two phases. The first phase involves the study of the wake behind a stationary circular cylinder (steady wake) in curved channels at positive, zero, and negative streamwise pressure gradients. The mean velocity and Reynolds stress components are measured using a X-hot-film probe. The measured quantities obtained in probe coordinates are transformed to a curvilinear coordinate system along the wake centerline and are presented in similarity coordinates. The results of the steady wakes suggest strong asymmetry in velocity and Reynolds stress components. However, the velocity defect profiles in similarity coordinates are almost symmetrical and follow the same distribution as the zero pressure gradient straight wake. The results of Reynolds stress distributions show higher values on the inner side of the wake than the outer side. Other quantities, including the decay of maximum velocity defect, growth of wake width, and wake integral parameters, are also presented for the three different pressure gradient cases of steady wake. The decay rate of velocity defect is fastest for the negative streamwise pressure gradient case and slowest for the positive pressure gradient case. Conversely, the growth of the wake width is fastest for the positive streamwise pressure gradient case and slowest for the negative streamwise pressure gradient. The second phase studies the development of periodic unsteady wakes generated by the circular cylinders of the rotating wake generator in a curved channel at zero streamwise pressure gradient. Instantaneous velocity components of the periodic unsteady wakes, measured with a stationary X-hot-film probe, are analyzed by the ph...

Download or read book A Study of the Development of Steady and Periodic Unsteady Turbulent Wakes Through Curved Channels at Positive Zero and Negative Streamwise Pressure Gradients Part 1 written by and published by . This book was released on 1996 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of the Development of Steady and Periodic Unsteady Turbulent Wakes Through Curved Channels at Positive Zero and Negative Streamwise Pressure Gradients written by Jose John and published by . This book was released on 1993 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book On Three dimensional Swirling Wakes written by Martin H. Steiger and published by . This book was released on 1962 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The velocity fields of three-dimensional viscous wakes with small swirl and streamwise pressure gradients are examined with the use of the boundary layer approximations, Ossen's linearization of the convective terms, and the assumption of constant fluid properties. Transform methods yield mathematically exact solutions with general types of initial conditions. The theory, while applicable to many practical problems (such as describing the phenomena in a tip vortex), is not applied here an its application is left for future investigation.

Download or read book Prediction of Characteristics of Two Dimensional Turbulent Wakes Under the Influence of Streamline Curvature and Zero Positive and Negative Pressure Gradients written by and published by . This book was released on 1996 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2013-12-11 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis seminated by the Center for Information and Numerical Data Analysis and Synthesis, (CINDAS) *at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac tivity was transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 19 (thesis year 1974) a total of 10,045 theses titles from 20 Canadian and 209 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. The organization of Volume 19 is identical to that of past years. It consists of theses titles arranged by discipline and by university within each discipline.

Download or read book A Calculation Method for the Incompressible Two dimensional Turbulent Wake with Streamwise Pressure Gradient written by D. M. Passchier and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1973 with total page 1102 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Compilation of Abstracts of Dissertations Theses and Research Papers Submitted by Candidates for Degrees written by Naval Postgraduate School (U.S.) and published by . This book was released on 1972 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Calculation Method for the Imcompressible Two dimensional Turbulent Wake with Streamwise Pressure Gradient written by D.M. Passchier and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Investigation of the High Speed Turbulent Boundary Layer with Heat Transfer and Arbitrary Pressure Gradient The Compressibility transformation written by Constantino Economos and published by . This book was released on 1970 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report investigates the behavior of high speed turbulent boundary layer with heat transfer and streamwise pressure gradient.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1983 with total page 1074 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characteristics of a Turbulent Wake Under Gradient Flow Conditions written by L. N. Uhkhanova and published by . This book was released on 1968 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are given of experimental studies of turbulent wakes in the plane and axisymmetric cases under positive and negative longitudinal pressure gradients and an approximate method of calculating such wakes is discussed. A positive longitudinal pressure gradient promotes more rapid decay of a turbulent wake than in the zero gradient case, whereas the opposite is true for a negative pressure gradient. (Author).

Download or read book Experimental Investigation of Transition to Turbulence As Affected by Passing Wakes written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-27 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental results from a study of the effects of passing wakes upon laminar-to-turbulent transition in a low-pressure turbine passage are presented. The test section geometry is designed to simulate the effects of unsteady wakes resulting from rotor-stator interaction upon laminar-to-turbulent transition in turbine blade boundary layers and separated flow regions over suction surfaces. Single-wire, thermal anemometry techniques were used to measure time-resolved and phase-averaged, wall-normal profiles of velocity, turbulence intensity, and intermittency at multiple streamwise locations over the turbine airfoil suction surface. These data are compared to steady state, wake-free data collected in the same geometry to identify the effects of wakes upon laminar-to-turbulent transition. Results are presented for flows with a Reynolds number based on suction surface length and exit velocity of 50,000 and an approach flow turbulence intensity of 2.5 percent. From these data, the effects of passing wakes and associated increased turbulence levels and varying pressure gradients on transition and separation in the near-wall flow are presented. The results show that the wakes affect transition both by virtue of their difference in turbulence level from that of the free-stream but also by virtue of their velocity deficit relative to the freestream velocity, and the concomitant change in angle of attack and temporal pressure gradients. The results of this study seem to support the theory that bypass transition is a response of the near-wall viscous layer to pressure fluctuations imposed upon it from the free-stream flow. The data also show a significant lag between when the wake is present over the surface and when transition begins. The accompanying CD-ROM includes tabulated data, animations, higher resolution plots, and an electronic copy of this report. Kaszeta, Richard W. and Simon, Terrence W. and Ashpis, David (Technical Monitor) Glenn Research Center NCC3-652; RTOP 71

Download or read book Control of Separation for Turbulent Boundary Layers Subjected to Wall Curvature and Streamwise Pressure Gradients written by Hermann F. Fasel and published by . This book was released on 2005 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: