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Adaptive Wall Wind Tunnel Investigation Of A Circulation Controlled Circular Cylinder
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Book Synopsis Adaptive Wall Wind Tunnel Investigation of a Circulation Controlled Circular Cylinder by : Roland Gunther Berndt
Download or read book Adaptive Wall Wind Tunnel Investigation of a Circulation Controlled Circular Cylinder written by Roland Gunther Berndt and published by . This book was released on 199? with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of a 2D-circulation Controlled Cylinder in an Adaptive Wall Wind Tunnel by : Fabrizio Adalberto Maria Dionisio
Download or read book Experimental Investigation of a 2D-circulation Controlled Cylinder in an Adaptive Wall Wind Tunnel written by Fabrizio Adalberto Maria Dionisio and published by . This book was released on 2003 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of the Effect of Wall Adaptation on Flow Over a Cylinder in a Modernized Adaptive-wall Wind Tunnel by : Michael Joseph Bishop
Download or read book Experimental Investigation of the Effect of Wall Adaptation on Flow Over a Cylinder in a Modernized Adaptive-wall Wind Tunnel written by Michael Joseph Bishop and published by . This book was released on 2010 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: A renovation of an adaptive-wall wind tunnel was completed to improve flow quality, automate data acquisition, integrate a three-axis traversing mechanism, and regain functionality of an adaptive-wall test section. Redesign of the settling chamber significantly improved flow quality, with the resulting turbulence intensity of 0.3% and flow uniformity of ±0.6% matching characteristics of research-grade wind tunnels. The functionality of the adaptive-wall test section was tested by analyzing the effect of wall adaptation on flow development over a circular cylinder. Experiments were carried out for a Reynolds number (Red) of 57,000 for three blockage ratios: 5%, 8%, and 17%. Measurements were made in three wall configurations: geometrically straight walls (GSW), aerodynamically straight walls (ASW), and streamlined walls (SLW). Solid blockage effects were clearly evident in cylinder surface pressure distributions for the GSW and ASW configurations, manifested by an increased peak suction and base suction. Upon streamlining the walls, pressure distributions for each blockage ratio matched distributions expected for low blockage ratios. Wake blockage limited wake growth in the GSW configuration at 7.75 and 15 diameters downstream of the cylinder for blockages of 17% and 8%, respectively. This adverse effect was rectified by streamlining the walls with the resulting wake width development matching that expected for low blockage ratios. Wake vortex shedding frequency and shear layer instability frequency increased in the GSW and ASW configurations with increasing blockage ratio. Invariance of the near wake width with wall configuration suggests that frequency increase is caused by the increased velocity due to solid blockage effects. For all the blockage ratios investigated, the increased wake vortex shedding frequency observed in the ASW and GSW configurations was corrected in the SLW configuration, with the resulting Strouhal numbers of about 0.19, matching that expected for low blockage ratios at the investigated Red.
Book Synopsis Oscillating-Flow Wind Tunnel Studies for a Circulation Control Circular Cylinder by :
Download or read book Oscillating-Flow Wind Tunnel Studies for a Circulation Control Circular Cylinder written by and published by . This book was released on 1991 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: A two-dimensional circulation control (4.25-in. diam. x 24-in. span) model was designed for installation in the Naval Postgraduate School oscillating flow, low speed wind tunnel. An adjustable, tangential blowing slots was included in the design to provide circulation control capability using the Coanda flow effect aft of the spanwise slot. Orifice locations were defined for obtaining surface static pressures which could be subsequently processed to yield sectional lift and drag coefficients. Pressure system calibrations were also made to determine the dynamic transfer function from a simulation of the model's static pressure orifice when connected to the pressure transducer. Similar transfer functions were determined for a static pressure probe. The existing data acquisition system was used to process the sampled digital data sequence. Clear-tunnel flow calibrations were performed in the (2'x2'x18.6' long) test section at a mid-length test station using a hot-wire and the calibrated static pressure probe. An oscillating velocity was superimposed upon a mean free stream motion using an existing rotating mechanism of 4 synchronized shutters at the end of the test section. Analytic estimates of both static pressure and velocity perturbations correlated well with experimental results for a frequency range of 14-40 Hz with a fixed value of shutter blockage.
Book Synopsis Research on Adaptive Wall Wind Tunnels by : Robert J. Vidal
Download or read book Research on Adaptive Wall Wind Tunnels written by Robert J. Vidal and published by . This book was released on 1978 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research was to investigate the utility of the Calspan self-correcting wind tunnel for minimizing or eliminating wall interference effects in two-dimensional transonic flows when shock waves from the test model extend to the tunnel walls. This report summarizes the experimental research performed with two-dimensional airfoils in the Calspan self-correcting wind tunnel and the theoretical research accomplished in support of the experiments. The experiments were performed with airfoil models having 4% and 6% solid blockage. The initial experiments with the 6%-blockage model were devoted to determining a practical mode of operation when shock waves from the model extend to the wall. The most practical model is to use wall control to obtain the desired distribution of longitudinal velocity components for subcritical walls. The Mach number is then increased and the wall control is readjusted, sequentially, until the desired test condition is achieved. At the high Mach numbers of interest, however, the available wall control was limited locally, and tunnel system changes were required. A method is reported for analyzing self-correcting wind tunnels with porous walls.
Book Synopsis Wind Tunnel Tests on Circulation-controlled Circular Cylinders in Steady and Heaving Motion by : Groves Eckley Herrick
Download or read book Wind Tunnel Tests on Circulation-controlled Circular Cylinders in Steady and Heaving Motion written by Groves Eckley Herrick and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Adaptive Wall Wind Tunnels by : Marie H. Tuttle
Download or read book Adaptive Wall Wind Tunnels written by Marie H. Tuttle and published by . This book was released on 1982 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Method for Modifying Two-dimensional Adaptive Wind-tunnel Walls Including Analytical and Experimental Verification by : Joel L. Everhart
Download or read book A Method for Modifying Two-dimensional Adaptive Wind-tunnel Walls Including Analytical and Experimental Verification written by Joel L. Everhart and published by . This book was released on 1983 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of Wind Tunnel Turbulence by Use of a Circular Cylinder by : Chester D. Mayerson
Download or read book An Experimental Investigation of Wind Tunnel Turbulence by Use of a Circular Cylinder written by Chester D. Mayerson and published by . This book was released on 1940 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experiments in a Three-dimensional Adaptive-wall Wind Tunnel by : Edward T. Schairer
Download or read book Experiments in a Three-dimensional Adaptive-wall Wind Tunnel written by Edward T. Schairer and published by . This book was released on 1983 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Adaptive Wall Wind Tunnels by : Marie H. Tuttle
Download or read book Adaptive Wall Wind Tunnels written by Marie H. Tuttle and published by . This book was released on 1986 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Adaptive Wall Wind Tunnels with Two Measured Interfaces by : C. F. Lo
Download or read book Investigation of Adaptive Wall Wind Tunnels with Two Measured Interfaces written by C. F. Lo and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of an Adaptive-wall Wind Tunnel by : Zeki Celik
Download or read book An Experimental Study of an Adaptive-wall Wind Tunnel written by Zeki Celik and published by . This book was released on 1988 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recent Years Cooperative Research on Adaptive Wall Wind Tunnel Technology by : He Jiaju
Download or read book Recent Years Cooperative Research on Adaptive Wall Wind Tunnel Technology written by He Jiaju and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Adaptive-Wall Wind-Tunnel Investigations by : J. C Erickson (Jr)
Download or read book Adaptive-Wall Wind-Tunnel Investigations written by J. C Erickson (Jr) and published by . This book was released on 1981 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of a program of research on transonic wind tunnels with adaptive walls for eliminating wall interference are presented. A description is given of related experimental research performed at other laboratories using several alternative methods for controlling the flow. Features of the segmented- plenum, perforated-wall, two-dimensional test section of the Calspan One-Foot Tunnel and the associated instrumentation for measuring the flow disturbance quantities are reviewed and necessary modifications made to the original experimental configuration are described. Details of adaptive-wall iteration experiments with a 4%-blockage NACA 0012 airfoil model are presented, particularly those at a free-stream Mach number of 0.9 and nominal angles of attack of 3, 2 and 1 deg. In these experiments, regions of supercritical flow terminated by shock waves extended to the tunnel walls. The results of the experiments indicate that successful iterations toward interference-free flow conditions are achieved. For another phase of the research, conceptual design studies of a three-dimensional transonic adaptive-wall test section using the segmented-plenum, perforated-wall method of flow control are reported. Finally, numerical simulations of low-speed flow within the Calspan test section, including the interaction of the transpired boundary layer at the walls with the flow over the model, are described in AIAA Paper No. 81-0160, which is appended to the report.
Book Synopsis Application of the Adaptive-wall Concept to Three-dimensional Low-speed Wind Tunnels by :
Download or read book Application of the Adaptive-wall Concept to Three-dimensional Low-speed Wind Tunnels written by and published by . This book was released on 1976 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
