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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
Nick Nolcheff1
17 Nov 2008
TL;DR: A diffuser system for a compressor for a gas turbine engine includes a diffuser and a plasma actuator, which is adapted to generate an electric field to ionize a portion of air flowing through the flow passage.
Abstract: A diffuser system for a compressor for a gas turbine engine includes a diffuser and a plasma actuator. The diffuser comprises a first wall and a second wall. The first and second walls form a diffuser flow passage therebetween. The plasma actuator is disposed at least partially proximate the second wall. The plasma actuator is adapted to generate an electric field to ionize a portion of air flowing through the flow passage.

27 citations

Journal ArticleDOI
C.M. Rhie1
TL;DR: In this paper, a partially parabolic procedure is developed to analyze three-dimensional viscous flows through curved ducts of arbitrary cross-section, eventually aimed at centrifugal impeller analysis, incorporating a finite volume method using a strong conservation form of the parabolized Navier-Stokes equations written in arbitrary curvilinear coordinates.

27 citations

Proceedings ArticleDOI
01 Aug 1983
TL;DR: In this article, the multidimensional ensemble averaged compressible time dependent Navier Stokes equations in conjunction with mixing length turbulence model and shock capturing technique were used to study the terminal shock type of flows in various flight regimes occurring in a diffuser/inlet model.
Abstract: The multidimensional ensemble averaged compressible time dependent Navier Stokes equations in conjunction with mixing length turbulence model and shock capturing technique were used to study the terminal shock type of flows in various flight regimes occurring in a diffuser/inlet model. The numerical scheme for solving the governing equations is based on a linearized block implicit approach and the following high Reynolds number calculations were carried out: (1) 2 D, steady, subsonic; (2) 2 D, steady, transonic with normal shock; (3) 2 D, steady, supersonic with terminal shock; (4) 2 D, transient process of shock development and (5) 3 D, steady, transonic with normal shock. The numerical results obtained for the 2 D and 3 D transonic shocked flows were compared with corresponding experimental data; the calculated wall static pressure distributions agree well with the measured data.

27 citations

Patent
Thomas Beck1, Silke Settegast1
16 Mar 2006
TL;DR: In this paper, a diffuser line on the inside of the diffuser is arranged to form an acute angle with the contour line, and the cross-section of the Diffuser is extended in the overflow direction.
Abstract: The component (1) has a film-cooling hole (28) in the outer region. A diffuser (13) is connected to the film-cooling hole extended to the lower portion (24). A contour line (47) along the contour (49) of the lower portion is parallel to the outflow direction. A diffuser line on the inside of the diffuser is arranged to form acute angle with the contour line. The cross section of the diffuser is extended in the overflow direction (37).

27 citations

01 Mar 1977
TL;DR: In this article, the authors investigated the three-dimensional flow field created by a simple line plume of finite length in a steady current of uniform density in a laboratory basin, and the results can be used to aid in the prediction of dispersion of buoyant waste water released from line diffusers, particularly sewage discharges into the ocean.
Abstract: The three-dimensional flow field created by a simple line plume of finite length in a steady current of uniform density was investigated in a laboratory basin. The results can be used to aid in the prediction of dispersion of buoyant waste water released from line diffusers, particularly sewage discharges into the ocean. The experimental results for minimum surface dilution, S_m, were found to be independent of L/H, in the range 3.7 < L/H < 30 where L is the diffuser length and H the water depth, and independent of Reynolds number, Re = 4uH/ν, in the range 1190 < Re < 12,900 where u is the current velocity. The results are expressed graphically in the form: (S_(m)q)/uH = f(F,θ), where q is the volume flux per unit length, and θ the orientation of the line diffuser to the current. F is a type of Froude number defined by F = u^(3)/b, where b is the buoyancy flux per unit length. The initial momentum flux is assumed to be small. For a current perpendicular to the diffuser, and F > 0.2, the effluent mixes over the receiving water depth due to self-induced turbulence. When the diffuser is of finite length, the diluted effluent separates from the bottom at some point downstream and forms a two-layer flow. However, currents parallel to the diffuser do not produce mixing over the depth, and the flow forms a two-layer system immediately, even for Froude numbers as high as 100. For F 0.1, dilutions when the current is perpendicular to the diffuser are proportional to the current speed. For 0.1 0.1, a diffuser placed perpendicular to the current will result in greater dilutions than if parallel. The ratio of minimum surface dilution when the current is perpendicular to that when the current is parallel increases with F, and is equal to about 4 at F = 100. Horizontal spreading of the waste field is governed by buoyancy forces rather than ambient turbulence. For F ≥ 1 the initial surface plume spreading is found to be linear, and independent of L/H and Re for 3.7 < L/H < 15, and 2,900 < Re < 13,000. Beyond this initial linear spreading zone the rate of plume growth decreases. It is speculated that regimes may exist where the surface width grows as the 2/3 or 1/5 power of downstream distance; the results are not adequate to confirm these growth laws. It is believed that ambient turbulence has no significant effect on diluting the waste within several diffuser lengths from the source. The results have been presented in a manner which makes them immediately applicable for improving outfall designs, and demonstrates the error frequently made in assuming two-dimensional flow fields. This assumption is incorrect even if the diffuser length is an order of magnitude greater than the water depth.

27 citations


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