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Diffuser (thermodynamics)

About: Diffuser (thermodynamics) is a research topic. Over the lifetime, 6731 publications have been published within this topic receiving 54738 citations.


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Patent
25 Oct 1993
TL;DR: In this article, a new venturi for producing medium expansion foam for use in fire fighting applications is presented, which consists of a swirl inducer bushing near the entry of the nozzle, a two-section frustum shaped diffuser, and a plurality of angularly oriented air injector openings.
Abstract: A venturi for producing medium expansion foam for use in fire fighting applications. The new venturi contains a swirl inducer bushing near the entry of the nozzle, a two section frustum shaped diffuser, and a plurality of angularly oriented air injector openings. The venturi progressively decreases in cross-sectional area from a discharge point thereof to a throat of the nozzle. The cross-sectional design together with orientation of the air injector permits high quality lasting foam to be produced under a broad fluid supply pressure while minimizing the amount of foam reagent employed.

22 citations

Journal Article
TL;DR: Negatively buoyant (plunging) flow from a horizontal, constant width channel into a diverging channel has been studied in the laboratory as discussed by the authors, which was undertaken to provide information on reservoir inflow and discharges onto beaches.
Abstract: Negatively buoyant (plunging) flow from a horizontal, constant width channel into a diverging channel has been studied in the laboratory. The study was undertaken to provide information on reservoir inflow and discharges onto beaches. The flow is a diffuser flow, and as a result, the boundary layer in a diffuser decelerates and thickens rapidly. In addition to being a diffuser flow, the flow studied is subjected to two other major effects. One of these is the shear stress on the channel bottom which causes the development of a boundary layer and vorticity in a vertical plane. The second is buoyancy which can strongly affect the distribution of flow in the diffuser. The paper discusses the experimental study, experimental facilities and variables, classification scheme, and experimental results.

22 citations

01 Jul 1973
TL;DR: In this article, the authors measured the pressure recovery performance of conical diffusers for a wide range of geometries and inlet flow conditions, and the approximate level and location of diffuser geometry of optimum performance were determined.
Abstract: The pressure recovery performance of conical diffusers has been measured for a wide range of geometries and inlet flow conditions. The approximate level and location (in terms of diffuser geometry of optimum performance were determined. Throat Mach numbers from low subsonic (m sub t equals 0.2) through choking (m sub t equals 1.0) were investigated in combination with throat blockage from 0.03 to 0.12. For fixed Mach number, performance was measured over a fourfold range of inlet Reynolds number. Maps of pressure recovery are presented as a function of diffuser geometry for fixed sets of inlet conditions. The influence of inlet blockage, throat Mach number, and inlet Reynolds number is discussed.

22 citations

Proceedings ArticleDOI
01 Jan 2007
TL;DR: In this paper, numerical simulation of three-dimensional flow in a one-stage centrifugal compressor with a diffuser of variable geometry has been performed using the ANSYS CFX 10 code.
Abstract: Numerical simulation of three-dimensional flow in a one-stage centrifugal compressor with a diffuser of variable geometry has been performed using the ANSYS CFX 10 code The computations were conducted using steady and unsteady flow formulations and employing the RANS two-equation turbulence models Steady-state flow simulations in the compressor were done for two vaned diffuser geometries with different radial gaps A detailed comparison with the experimental data reported in the literature for different operating points of the “Radiver” test case compressor is presented and discussed Good agreement of the computed velocity field with the measurements data is obtained at the impeller exit Downstream of the diffuser vane, prediction quality depends on the operating point Transient simulations performed for the best operating point of the compressor did not improve considerably predictions of flow characteristics in the diffuser as compared to the steady-state approachCopyright © 2007 by ANSYS Germany GmbH and GE Global Research

22 citations

Patent
29 Aug 2006
TL;DR: A radial diffuser as discussed by the authors comprises a housing, a plurality of diffuser vanes, and integral service vanes to define diffusion flow passages, each in fluid communication with at least one diffusion flow passage, and at least some of the integral vanes include a service passage extending therethrough and configured to allow a service conduit to extend therethrough without crossing either a diffuser flow passage or a transition flow passage.
Abstract: A radial diffuser comprises a housing, a plurality of diffuser vanes, and a plurality of integral service vanes. The housing includes an air inlet and an air outlet, and defines a radial section extending radially outward from the air inlet, an axial section extending axially to the air outlet, and a transition including a bend and extending between the radial and axial sections. The diffuser vanes are coupled to the housing, and are disposed in, and define diffusion flow passages. The integral service vanes are coupled to the housing, extend around the bend, and define transition flow passages, each in fluid communication with at least one diffusion flow passage. At least some of the integral service vanes include a service passage extending therethrough and configured to allow a service conduit to extend therethrough without crossing either a diffusion flow passage or a transition flow passage.

22 citations


Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20224
2021156
2020186
2019216
2018236
2017263