Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 58 for “"Diffusers"”.
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Flow-field structure in wide-angled diffusers
Includes bibliographical references (leaves 121-131).
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Two dimensional diffusers with plenum and tailpipe discharge.
Two dimensional diffusers, both with and without tailpipes, have been tested with different inlet boundary layer conditions and various diffuser geometries. The effect on the developing boundary layer parameters within the diffuser and tailpipe are investigated for the various conditions. The …
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Flows through s-shaped annular, inter-turbine diffusers
Inter-turbine diffusers or swan neck ducts (SND's) provide flow continuity between the H.P. and L.P. turbine, which with diffusing of the flow allow; greater stage efficiencies to be achieved as a consequence of reducing both the stage loading and flow coefficient of the L.P. turbine. This thesis …
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Modeling of undirectional thermal diffusers in shallow water.
Thesis. 1977. Ph.D.--Massachusetts Institute of Technology. Dept. of Civil Engineering.
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Submerged multiport diffusers in shallow water with current.
Massachusetts Institute of Technology, Dept. of Civil Engineering. Thesis. 1972. M.S.
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One-Dimensional Performance Modeling of Centrifugal Flow Vaned Diffusers
… and DELTA5p, for two different types of vaned diffusers, channel and cascade, are proposed. These models were developed with frozen impeller modeling. This is the first time that modeling the TEIS and Two Zone input parameters has been attempted for vaned diffusers and impeller-diffuser …
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Active and hybrid flow control in S-ducts and diffusers
"This dissertation documents the research endeavor conducted by the author in the field of aerodynamic flow control. The objectives were to develop flow control actuators, investigate their mechanism, and study their application on different flow-fields. Two flow control actuators - a pneumatic and …
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Unsteady separation point injection for pressure recovery improvement in high subsonic diffusers
Thesis (S.M. and E.A.A.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2002.
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The mechanics of submerged multiport diffusers for buoyant discharges in shallow water.
Massachusetts Institute of Technology. Dept. of Civil Engineering. Thesis. 1973. Ph.D.
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The role of impeller outflow conditions on the performance and stability of airfoil vaned radial diffusers
This thesis quantifies the relative importance of the impeller outflow angle, Mach number, non-uniformity and unsteadiness on diffuser performance, through diffuser experiments in a compressor stage and in a swirling flow test rig combined with steady and unsteady Reynolds-Averaged Navier Stokes …
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Enhanced Microbial Activity and Energy Conservation through Pneumatic Mixing in Sludge Systems
… the performance of standard low pressure air diffusers in two types of aerated systems (activated sludge and aerobic sludge digestion) and to decrease overall energy consumption. Aerated treatment systems are very important in the treatment of wastewaters and management of sludges. The …
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The Effects of Diffuser Exit Velocity and Distance Between Supply and Return Apertures on the Efficiency of an Air Distribution System in an Office Space
<p>The distance between supply air diffusers and return air grilles is an important design parameter that has not been properly investigated. Sometimes, design and installation constraints force the engineer or the contractor to place the return duct close to the supply duct which can have a huge …
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Giving voice to ideas : the role description plays in the diffusion of radical innovations
… as self-evident. whereas the author found that diffusers of these radical. practice innovations unintentionally gave incomplete and in some cases misleading descriptions of their work. An argument is made that effective description must do more than represent the original innovation with some …
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Numerical Analysis of the Viscous Flow in a Supersonic Diffuser
… losses in total pressure. Existing supersonic diffusers are based on compression through shock waves. This process is inherently inefficient because of the large losses caused by the shocks. We investigate by means of Computational Fluid Dynamics (CFD) the viscous flow in a supersonic diffuser …
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Controlling Dissolved Oxygen, Iron and Manganese in Water-Supply Reservoirs using Hypolimnetic Oxygenation
… oxygenation systems, such as linear bubble-plume diffusers, are used to improve raw water quality. Linear bubble-plume diffusers were installed in Spring Hollow Reservoir (SHR) and Carvins Cove Reservoir (CCR). Diffusers induce mixing that aids distribution of oxygen throughout the hypolimnion. …
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Edgelit holography : extending size and color
… techniques for obtaining true-color holographic diffusers are described. Finally, a coupled H1-H2 edgelit hologram recording method is described which has potential applications for the mass-production of holographic diffusers and stereograms.
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Sediment Oxygen Demand Kinetics
Hypolimnetic oxygen diffusers increase sediment oxygen demand (SOD) and, if not accounted for in design, can further exacerbate anoxic conditions. A study using extracted sediment cores, that included both field and laboratory experiments, was performed to investigate SOD kinetics in Carvin's Cove …
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