Download or read book Development of an Instrument for Measuring Wind Tunnel Turbulence written by David Edward Moore (Jr.) and published by . This book was released on 1940 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of a Corona Anemometer for Measurement of Stratospheric Turbulence written by R. E. Good and published by . This book was released on 1978 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The length of time pollution remains in the stratosphere depends upon the intensity of stratospheric turbulence. Measurement of stratospheric turbulence has been limited due to the lack of a suitable instrument. A new instrument has been developed to meet this need. The corona anemometer sensor development is described from the physical principles of operation through the electronic circuitry, laboratory and in-flight calibrations to the first test flight. The corona anemometer measures the stratospheric wind and turbulence by detecting the amount of displacement the corona ion beam suffers in transversing a one inch gap exposed to the horizontal wind. The instrument response is linear and has a frequency response from 0 to 2000 Hz, sufficient to measure atmospheric turbulence directly. The use of this instrument in the measurement of stratospheric turbulence will significantly enhance the knowledge of stratosphere properties and improve the accuracy of environmental assessments. (Author).

Download or read book Wind Tunnels of NASA written by Donald D. Baals and published by . This book was released on 1981 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wind Tunnels and Experimental Fluid Dynamics Research written by Jorge Colman Lerner and published by BoD – Books on Demand. This book was released on 2011-07-27 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book "Wind Tunnels and Experimental Fluid Dynamics Research" is comprised of 33 chapters divided in five sections. The first 12 chapters discuss wind tunnel facilities and experiments in incompressible flow, while the next seven chapters deal with building dynamics, flow control and fluid mechanics. Third section of the book is dedicated to chapters discussing aerodynamic field measurements and real full scale analysis (chapters 20-22). Chapters in the last two sections deal with turbulent structure analysis (chapters 23-25) and wind tunnels in compressible flow (chapters 26-33). Contributions from a large number of international experts make this publication a highly valuable resource in wind tunnels and fluid dynamics field of research.

Download or read book Measurement of Wind Tunnel Turbulence by the Hot Wire Method and Suppression of Wind Tunnel Vibrations written by H. Eckelmann and published by . This book was released on 1972 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of hot-wire measurements to determine turbulence levels made in the 1-meter, 3-meter and low-turbulence wind tunnels of the AVA are reported. A newly-developed (AVA), fully transistorized hot-wire anemometer was used in carrying out the measurements. (Author).

Download or read book Wind tunnel Calibration Techniques written by Alan Pope and published by . This book was released on 1961 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Air-flow measuring instruments, their use, and the manner of working up and presenting the data obtained when calibrating low-speed, nearsonic, transonic, supersonic, and hypersonic wind tunnels are discussed. (Author).

Download or read book The Development of a Rapid Vertical Profiling Technique for Turbulence Measurements written by Gareth Dominick De Sanctis and published by . This book was released on 2002 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization of the Flow Field Wind Speed Profiles and Turbulence Intensity in Environmental Wind Tunnels for Measurement of Agent Fate written by and published by . This book was released on 2005 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface evaporation and desorption sub-models in VLSTRACK require measurements of chemical warfare agent evaporation and desorption under environmental conditions. A 5cm square by approximately I meter wind tunnel for chemical agent measurements was developed with optional strakes and roughening elements to add turbulence. Flow was developed in the pull-mode by an electric blower system. Several candidate intake geometries were designed that allowed controlled restriction of air intake to control wind speed. The flow field was characterized as a function of several intake control geometries and as a function of the presence or absence of the turbulence elements. A micrometer positioning device was employed to traverse the wind tunnel cross section with a subminiature hot wire anemometer. A TSI Model IFA-300, temperature-compensated, hot wire anemometry system was utilized for all measurements. The experimental and computational fluid dynamic flow field results were documented. The tipper and lower limits of wind speed available from the electric blower and intake restriction systems were determined. The symmetry of the flow field with and without turbulence elements was also determined. The chemical droplets are placed on substrates on the floor of the wind tunnel; therefore, flow field measurements close to the floor were emphasized. Finally, the reproducibility of the wind speed was measured as a function of blower power settings and intake restrictions levels.

Download or read book Summary Report on the Development of a Hot wire Turbulence sensing Element for Use in Water written by R. G. Stevens and published by . This book was released on 1956 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Development of a Rapid Vertical Profiling Technique for Turbulence Measurements written by Miyuki Takagi and published by . This book was released on 2002 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Preliminary Experiments on the Simulation of Gusts in a Wind Tunnel written by Arnold Martin Kuethe and published by . This book was released on 1955 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wind Environment Around Buildings written by A. D. Penwarden and published by . This book was released on 1975 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Copies are supplied by TSO's on-demand publishing service

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1986 with total page 1108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aerodynamic Data Accuracy and Quality written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Fluid Dynamics Panel. Symposium and published by . This book was released on 1988 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: The wind tunnel continues to be the main instrument for providing experimental aerodynamic data to the aerospace industry and the aerodynamic researcher for the purpose of load and performance evaluation and for verification of theoretical results. In both cases it is imperative that the user has confidence in the quality of the results, which means that he must have information on what accuracy to attach to the data. The quality of wind tunnel results depends upon both the accuracy of measurements and the imperfections provided by the wind tunnel environment. Great strides have been made in recent years on measurement accuracy and as a rule this need no longer be of much concern if properly attended to. However, imperfections provided by the wind tunnel environment are still with us and these are today the main sources affecting the quality and accuracy of aerodynamic data obtained in a wind tunnel. It was the purpose of this symposium to try to define what accuracy has presently been achieved in modern facilities and to compare these achievements with the actual demands of the user.

Download or read book Thermal Method of Measurement of Turbulence in Wind Tunnels written by B. Ya Trubchikov and published by . This book was released on 1970 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report discusses the general theory of diffusion in a turbulent flow and forms the basis of the method of measurement of turbulence in wind tunnels by studying the diffusion of heat behind a thin heated wire. Cited are results of measurements of temperature of velocity fields behind a round cylinder, conducted with a wide range of changes of relative distance from the cylinder. A description is given of the measuring equipment and basic results of investigations, connected with development of the method and technology of the experiment. Results of measurements by the thermal method are compared with other methods. In conclusion there are cited results of investigation of turbulence of flow in a number of wind tunnels by the thermal method. (Autor).

Download or read book A New Wind Vane for the Measurement of Atmospheric Turbulence written by and published by . This book was released on 1997 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Cooperative Research and Development Agreement (CRADA) between Met One Instruments, Incorporated (Met One) and Westinghouse Savannah River Company (WSRC) was created to develop a new wind vane that more accurately measures atmospheric turbulence. Through a process that had several phases, Met One created a prototype vane that was designed to attach to the existing Model 1585 Bi-Directional Wind Vane instrument structure. The prototype contained over 20% less mass to enhance responsiveness, which was also increased through the use of a teardrop-shaped fin structure. The prototype vane can be readily manufactured for commercial retail. Tests in wind tunnel of Building 735-7A, the Meteorological Engineering Facility, indicated that the new vane has a superior starting threshold of less than 0.14 meter per second, a delay distance of 0.72 meter, and a damping ratio of 0.4. The relative accuracy of less than one degree is unchanged from the previous design. The vane bias was acceptable at 0.8 degree for the horizontal wind angle, but was slightly high at 1.4 degree for the verticle wind angle. The high value of the verticle wind angle bias can most likely be reduced to the desired less than one degree value with standard manufacturing production techniques. The durability of the prototype vane was not tested in the field but is expected to be slightly less due to the use of hollow rather than foam-filled fins. However, the loss of some durability is more than compensated with increased sensitivity at low wind speeds. Field testing of the prototype is required to test for adequacy of durability.

Download or read book Development of a Nonstationary Flow Device for an Atmospheric Boundary Layer Wind Tunnel written by Nicholas Jon Spencer-Berger and published by . This book was released on 2003 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Iowa State University researchers are in the process of developing a new wind tunnel. This tunnel will be able to perform a wide range of tests. It will not only be used in an aerodynamic (Aero) test section configuration, but also in an atmospheric boundary layer (ABL) type configuration. It will be able to create a model of the turbulent boundary layer that all structures in the atmosphere are submersed in. The tunnel is designed to utilize both closed return as well as open return tunnel configurations. This will enable the tunnel to reap the benefits of both types of tunnels. Currently most of the ABL studies rely on the assumption that atmospheric velocity variations are adequately modeled by stationary mean and turbulent flow properties. The ISU Aero/ABL tunnel will be able to develop non-stationary flows to help better study and understand this type of phenomena. The primary concern and area of research reported here has been to develop this non-stationary flow device by modeling and testing the design. The results shown reflect that a 107% gust can be achieved by the model, but with some changes to the design, a higher magnitude gust can be achieved.