1,296 research outputs found

    Control of flow separation and mixing by aerodynamic excitation

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    The recent research in the control of shear flows using unsteady aerodynamic excitation conducted at the NASA Lewis Research Center is reviewed. The program is of a fundamental nature, concentrating on the physics of the unsteady aerodynamic processes. This field of research is a fairly new development with great promise in the areas of enhanced mixing and flow separation control. Enhanced mixing research includes influence of core turbulence, forced pairing of coherent structures, and saturation of mixing enhancement. Separation flow control studies included are for a two-dimensional diffuser, conical diffusers, and single airfoils. Ultimate applications include aircraft engine inlet flow control at high angle of attack, wide angle diffusers, highly loaded airfoils as in turbomachinery, and ejector/suppressor nozzles for the supersonic transport. An argument involving the Coanda Effect is made that all of the above mentioned application areas really only involve forms of shear layer mixing enhancement. The program also includes the development of practical excitation devices which might be used in aircraft applications

    Accident prevention in cement plants

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    The cement industry as a whole took up accident prevention work along with the pioneers. With the organization of the Portland Cement Association, a Bureau of Accident Prevention was formed. This Accident Prevention Bureau, by sending out literature, holding competitions, collecting and tabulating results of accidents collected from every cement manufacturer and affiliating with National Safety Council as the Cement Section, has made rapid strides each year, until today it is doubtful if any other branch of manufacturers can show more improvement in accident records than the cement industry. In spite of their marked improvements each year, there were 47 fatal accidents in the cement industry in 1922, which shows that there is still room for improvement --page 3

    Inlets, ducts, and nozzles

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    The internal fluid mechanics research program in inlets, ducts, and nozzles consists of a balanced effort between the development of computational tools (both parabolized Navier-Stokes and full Navier-Stokes) and the conduct of experimental research. The experiments are designed to better understand the fluid flow physics, to develop new or improved flow models, and to provide benchmark quality data sets for validation of the computational methods. The inlet, duct, and nozzle research program is described according to three major classifications of flow phenomena: (1) highly 3-D flow fields; (2) shock-boundary-layer interactions; and (3) shear layer control. Specific examples of current and future elements of the research program are described for each of these phenomenon. In particular, the highly 3-D flow field phenomenon is highlighted by describing the computational and experimental research program in transition ducts having a round-to-rectangular area variation. In the case of shock-boundary-layer interactions, the specific details of research for normal shock-boundary-layer interactions are described. For shear layer control, research in vortex generators and the use of aerodynamic excitation for enhancement of the jet mixing process are described

    Inlets, ducts and nozzles

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    The internal fluid mechanics research program in inlets, ducts, and nozzles is described. The program consists of a balanced effort between the development of computational tools and the conduct of experimental research. The experiments are designed to better understand the fluid flow physics, to develop new or improved flow models, and to provide benchmark quality data sets for validation of the computational methods. The inlet, duct, and nozzle research program is described according to three major classifications of flow phenomena: highly three-dimensional flow fields; shock-boundary layer interactions; and shear layer control. Specific examples of current and future elements of the research program are described for each of these phenomena. In particular, the highly three-dimensional flow field phenomena is highlighted by describing the computational and experiemental research program in transition ducts having a round-to-rectangular area variation. In the case of shock-boundary layer interactions, the specific details of research for normal shock-boundary layer interactions are described. For shear layer control research in vortex generators and the use of aerodynamic excitation for enhancement of the jet mixing process are described. Future research in inlets, ducts, and nozzles will include more emphasis on three-dimensional full Navier-Stokes methods and corresponding experiments designed to concentrate on the appropriate three-dimensional fluid flow physics

    Notes on the meteorology and mortality of the month of June, 1870.

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    Meteorological records recorded at the Observatory, Hobart Town. Also includes leafing, flowering, and fruiting times of a few standard plants in the Royal Societies gardens for the month of June, 1870.- The general character of the month was not propitious to life, and the deaths of adults, and particularly old people above 60 years old, were unusually large, while in children under 10 years of age, the deaths were remarkably few. Nevertheless, there was no prevailing sickness of an epidemic character

    Bomb Media 1951-1964

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    This thesis looks at nuclear films, commercial and governmental, that were released between 1951 and 1964. Special attention is paid to the recursivity that existed between the propagandic, often outrageously inaccurate Civil Defense films made by the United States government and the subversive popular films made by visionary dissidents. The films are divided into three periods. The earliest period focuses on Samuel Fuller\u27s Pickup on South Street and the Robert Aldrich \u27s Kiss Me Deadly (based on the novel by Mickey Spillane), along with some of the earliest Civil Defense films. Special attention is paid to the politically minded creation of the Civil Defense Bureau, as well as how the governmental films grounded their exploitative power in patriotism, fear, and the supposedly manifest goodness of the American government. The second period focuses on the liberalization of the post-McCarthyist film industry and the production of more overtly antinuclear films, including the chilling On the Beach. This era of dissent, punctuated by frank discussions of the danger of nuclear war, segues into critical readings of nuclear war that focus on the uniquely theoretical danger that a potential all-out nuclear exchange poses, pinning much of the danger of nuclear war on the very existence of nuclear discourse

    The Neighborhood’s Catalogue: Lower East Side Planning and Design File

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    This catalogue was designed to support the process of slow redevelopment over time, combined with conservation of diverse social and historical continuity and the exploration of new land and building uses. The catalogue shows how to involve neighborhoods in participation, supportive design, incremental planning and phased development. This project was made possible by a grant from the National Endowment for the Arts. Reprinted in 1987.https://dc.uwm.edu/caupr_mono/1047/thumbnail.jp
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