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Showing 1 to 20 of 158 for “"Diffuser"”.
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CFD study of diffuser geometry effects on diffuser augmented wind turbine performance
… thesis aims to explore the performance limits of diffuser augmented wind turbines. Many studies of this topic have been performed in the past. Limiting assumptions and manufacturing concerns have forced the majority of previous studies to stray away from finding optimal performance in favor of …
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Synergistic diffuser/heat-exchanger design
… for this development is based on current diffuser and heat-exchange technologies in cogeneration plants, which require a large geometric footprint to generate steam using gas-turbine exhaust. A compact design is hypothesized to replace these technologies using synergistic design concepts. …
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Impeller-diffuser interaction in centrifugal compressors
… simulation, to define the effect of impeller-diffuser interaction on the performance of a centrifugal compressor stage. The principal finding from the study was that the most influential aspect of this unsteady interaction was the effect on impeller tip leakage flow . In particular, the …
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Diffuser Operations at Spring Hollow Reservoir
… 1997 Roanoke County purchased a bubble-plume diffuser from Tennessee Valley Authority (TVA) to oxygenate the hypolimnion to maintain long-term water quality. Spring Hollow currently operates the diffuser, with compressed air, during late summer months when DO levels in the hypolimnion reach …
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The improvement of wind tunnel diffuser characteristics
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Aeronautical Engineering, 1949.
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Numerical investigation of the Campbell diffuser concept
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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Experimental and simulation study of a diffuser augmented wind turbine to enhance the performance by modifying diffuser and rotor
… a technique of augmenting wind by the concept of diffuser augmented wind turbine (DAWT) has been presented to improve the efficiency of small scale of HAWT by enclosing it with a suitable diffuser. The study included two stages for performance improvement; first, developing the diffuser design in …
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Quasi-unsteady flow in a radial vaneless diffuser
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1961.
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Effects of impeller-diffuser interaction on centrifugal compressor performance
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.
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Numerical Analysis of the Viscous Flow in a Supersonic Diffuser
<p>The goal of a diffuser is to transform kinetic energy into potential energy with minimum 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 …
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Simulation of spike stall inception in a radial vanted diffuser
… centrifugal compressors can be formed by a vaned diffuser. To address these issues, a numerical study on an advanced, vaned-diffuser centrifugal compressor was conducted to investigate stall inception. A steady three-dimensional Reynolds-averaged Navier-Stokes simulation using a mixing plane was …
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Active Flow Control of a Boundary Layer Ingesting Serpentine Diffuser
… use of serpentine boundary layer ingesting (BLI) diffusers offers a significant benefit to the performance of Blended Wing Body aircraft. However, the inherent diffuser geometry combined with a thick ingested boundary layer creates strong secondary flows that lead to severe flow distortion at the …
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The aerodynamics of a diffuser equipped bluff body in ground effect
An investigation of the flow physics of a diffuser equipped bluff body in ground effect has been undertaken. Situated at the rear of a racing car undertray, the diffuser is an important component and the least understood part of the vehicle. Diffuser performance can change dramatically with vehicle …
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Study of an Incompressible Turbulent Boundary Layer in a Conical Diffuser
Made available in DSpace on 2014-12-04T23:10:54Z (GMT). No. of bitstreams: 1 0019820.pdf: 6314928 bytes, checksum: 3a2a40136e94d02f4fa786d0cdf1aed6 (MD5) Previous issue date: 1956
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Investigation of stall inception in centrifugal compressors using isolated diffuser simulations
… but spikes can also occur in shrouded vaned diffusers of centrifugal compressors, where these flows are not present, suggesting an alternative mechanism may be at play. Unsteady Reynold's Averaged Navier-Stokes simulations are performed for an isolated vaned radial diffusers from a highly …
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Scaling of impeller response to impeller-diffuser interactions in centrifugal compressors
… conducted to quantify the effect of impeller-diffuser interaction on changes in impeller performance. An assessment is made of the hypothesis that the nondimensional parameter characterizing impeller performance change due to interaction is the ratio of the radial gap between the impeller …
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Performance optimization of a subsonic Diffuser-Collector subsystem using interchangeable geometries
… designed and built to test and optimize various diffuser-collector box geometries at the one-twelfth scale. The facility was designed to run continuously at an inlet Mach number of 0.42 and an inlet hydraulic diameter Reynolds number of 340,000. Different combinations of diffusers, hubs, and …
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Characterization of unsteady loading due to impeller-diffuser interaction in centrifugal compressors
… unsteady impeller blade loading due to imipeller-diffuser interaction in centrifugal compressor stages. The capability of simulations are assessed by comparing results against unsteady pressure and velocity measurements in the vaneless space. Simulations are shown to be adequate for identifying …
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Diffuser Fouling Mitigation, Wastewater Characteristics And Treatment Technology impact on Aeration Efficiency
… costs. A pilot scale study of fine pore diffuser fouling and mitigation, quantified by dynamic wet pressure (DWP), oxygen transfer efficiency and alpha measurement were performed at Blue Plains, Washington DC. In the study a mechanical cleaning method, reverse flexing (RF), was used to …
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