Download or read book Investigation of a Two dimensional Fully Stalled Turbulent Flow Field written by Granger Kam-Chuen Chui and published by . This book was released on 1967 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of a Two dimensional Fully Stalled Turbulent Flow Field written by G. Chui and published by . This book was released on 1967 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: The bistable, steady, turbulent separation phenomenon observed in a two-dimensional fully-stalled diffuser is studied. Detailed mean flow data including pressure, dissipation and velocity (both magnitude and direction) inside the flow field as well as development of boundary layers on both side walls are reported for cases with thin and thick boundary layers at inlet and with and without fairing curves at the throat. For all cases, most important changes in flow data occur in a region within two inlet widths up and downstream of the throat. Pressure gradients in this region are so large that the boundary layer on the unstalled side changes shape abruptly while the layer on the stalled side separates in the vicinity of the throat. Streamline patterns are obtained from the velocity distributions. The location of the dividing streamline is different for the different cases. Based on the dividing streamline, a displacement line is defined to extend the concept of displacement thickness to the free shear layer which is developed from the separated boundary layer. This displacement line together with the loci of boundary layer displacement thicknesses on the solid walls form an effective channel. The shape and area ratio of this effective channel explain the different trends of pressure distributions in the main flow. (Author).

Download or read book Investigation of Turbulent Flow in a Two dimensional Channel written by John Laufer and published by . This book was released on 1950 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed exploration of the turbulent flow characteristics in a two-dimensional channel is presented. The measurements were made at three Reynolds numbers, 12,300, 30,800, and 61,600, based on the half width of the channel and the maximum mean velocity. A channel of 5-inch width and 12:1 aspect ratio was used for the investigation.

Download or read book Theoretical and Experimental Investigation of Flow Over Single and Double Backward Facing Steps written by Douglas Eugene Abbott and published by . This book was released on 1961 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book OAR Cumulative Index of Research Results written by and published by . This book was released on 1967 with total page 1264 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 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Theoretical and Experimental Investigation of Flow Over Single and Double Backward Facing Steps written by Stanford University. Thermosciences Division. Thermosciences Division and published by . This book was released on 1961 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: A semi-empirical analysis is developed for the over-all flow pattern of subsonic turbulent flow over backward facing steps. Good agrement is found between theory and experiment for the prediction of two-dimensional reattachment length for small values of step height to throat width ratio; an asymptotic solution for large values of step height is also given and discussed. Mean velocity profiles calculated by the present analysis are shown; they require an empirical fit at one point. Good agreement with experiment is found in the region near the step face, but agreement is poor near the reattachment region. Experimental results are represented for flow patterns over backward facing steps covering a wide range of geometric variables. Velocity profile measurements are given for both single and double steps. The stall region is shown to consist of a complex pattern involving three distinct regions. The double step contains an asymmetry for large expansions, but approaches the single-step configuration with symmetric stall regions for small values of area ratio. No effect on flow pattern or reattachment length is found for a wide range of Reynolds numbers and turbulence intensities, provided the flow is fully turbulent before the step. (Author).

Download or read book Experimental Investigation of the Transitory Stall Regime in Two Dimensional Diffusers Including the Effects of Periodically Disturbed Inlet Conditions written by Stanford University. Thermosciences Division and published by . This book was released on 1971 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Government Research Development Reports written by and published by . This book was released on 1968 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Note National Advisory Committee for Aeronautics written by United States. National Advisory Committee for Aeronautics and published by . This book was released on 1951 with total page 1152 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Kinetics of Sintering Chromium Carbide written by W. G. Lidman and published by . This book was released on 1951 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sintering of chromium carbide under pressure was investigated in order to study the kinetics of grain growth and densification during this process. Densification was accompanied by grain growth, and density and grain size seem to be interdependent during this stage. Grain growth continued after densification was complete, and for this stage an activation energy for grain growth was obtained.

Download or read book Investigation of Lateral Control Near the Stall written by Fred E. Weick and published by . This book was released on 1953 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flight tests were made with a typical light airplane to investigate possibilities for obtaining reliable control at low flight speeds. It was found that satisfactory lateral control occurred consistently, even under conditions simulating extremely gusty air, at angles of attack approximately 2 degrees below that for the maximum lift coefficient (or the stall of the wing as a whole). This 2 degree margine was substantially the same both with full power and with the engine throttled and throughout the range of center-of-gravity locations tested. Supplementary tests were then made on the control at high angles of attack under actual gusty air conditions, on the possibility of entering spins, and on the amount of elevator control required for normal three-point landings. It was found that with the original plain untwisted wing obtaining the constant 2 degree margin below the stall required widely different elevator deflections for the range of power and center-of-gravity locations tested. Also, none of these settings ws high enough to produce a three-point landing.

Download or read book A Method for Calculation of a Fully Stalled Flow written by R. L. Woolley and published by . This book was released on 1973 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: An interacting zone method of calculation is developed for predicting stalled turbulent flows which are nominally two-dimensional, incompressible, and steady. The total problem is divided into zones selected such that each can be represented by a manageable analytical model. When applied to the case of the fully stalled diffuser, adequate a priori predictions are achieved with careful handling. Predictions show a strong sensitivity to location of separation -- as does the actual diffuser. This suggests specific further consideration of analytical models for the zone near separation. Given improved modeling of conditions in the vicinity of separation, even more accurate predictions of the primary flow characteristics are highly likely. (Modified author abstract).

Download or read book Flow in Primary Non rotating Passages in Turbomachines written by H. J. Herring and published by . This book was released on 1979 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Transient Switching of Fluidic Bistable Wall Attachment Amplifiers written by Jeffrey William Gordon and published by . This book was released on 1969 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in Simulation of Wing and Nacelle Stall written by Rolf Radespiel and published by Springer. This book was released on 2015-07-09 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book reports on advanced solutions to the problem of simulating wing and nacelle stall, as presented and discussed by internationally recognized researchers at the Closing Symposium of the DFG Research Unit FOR 1066. Reliable simulations of flow separation on airfoils, wings and powered engine nacelles at high Reynolds numbers represent great challenges in defining suitable mathematical models, computing numerically accurate solutions and providing comprehensive experimental data for the validation of numerical simulations. Additional problems arise from the need to consider airframe-engine interactions and inhomogeneous onset flow conditions, as real aircraft operate in atmospheric environments with often-large distortions. The findings of fundamental and applied research into these and other related issues are reported in detail in this book, which targets all readers, academics and professionals alike, interested in the development of advanced computational fluid dynamics modeling for the simulation of complex aircraft flows with flow separation.

Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: