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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
23 Jan 2013
TL;DR: In this article, the authors describe a power conversion device with a diffuser and a rotor, which operate as a turbine/generator and as a motor/pump, respectively.
Abstract: Power conversion device (20) including: a first fluid conduit (21); a diffuser (22) attached thereto with at least one vane supporting a diffuser hub (25); a rotor (23) supported by the diffuser hub and having a rotor blade (23 A), hub, and shroud (28) at the periphery thereof with at least one magnet (29) thereon; a housing (32) surrounding the shroud and attached to the diffuser, and having a stator (36) including laminations (31) forming poles (3 IP) and at least one coil (33) therearound, the stator encapsulated in a non-metallic compound (35) to prevent fluid contact with laminations and coil(s); a commutation control (44) connected to the coil(s) and having external leads (45); and a second fluid conduit (24) attached to the housing so fluid flow causes a torque load on the blades, rotating the rotor and inducing a magnetic field in the poles to generate current in the coil, converting hydraulic power to electric power. The device operates as a turbine/generator and as a motor/pump.

16 citations

Patent
Raymond C Davis1
02 Oct 1969
TL;DR: In this article, a diffuser with similarly relieved areas in the vanes thereof is used to communicate the disparate pressure zones to either sides of the vana. But the diffuser is not designed to control the fluid boundary layer.
Abstract: Fluid compressor, pump, or like fluid-motion apparatus having rotor with blades interposed in a housing chamber intermediate the fluid inlet and discharge ports. The blades have relieved areas formed in the lateral edges thereof which interface a wall of the chamber to communicate a high-fluid pressure zone on the one side of said blades with a low-fluid pressure zone at the other side of said blade, thereby to control the fluid boundary layer. Further included is a diffuser with similarly relieved areas in the vanes thereof to communicate the disparate pressure zones to either sides of the vanes.

16 citations

Journal ArticleDOI
01 Sep 2001
TL;DR: In this paper, two-dimensional particle image velocimetry has been used in order to analyse the flow in the outlet part of a centrifugal pump (impeller and vaneless diffuser). Tests have been carried out in air.
Abstract: Two-dimensional particle image velocimetry has been used in order to analyse the flow in the outlet part of a centrifugal pump (impeller and vaneless diffuser). Tests have been carried out in air. The paper first describes the main characteristics of the centrifugal pump and the associated test facilities. An analysis of the main results in design operating conditions of the SHF (Societe Hydro-technique de France) impeller is then proposed.

16 citations

Journal ArticleDOI
TL;DR: In this paper, the authors presented a numerical investigation of pressure recovery and flow uniformity in turning diffusers with 90o angle of turn by varying geometric and operating parameters, including area ratio (AR= 1.6, 2.0 and 3.0) and inflow Reynolds number (Rein=23, 2, 7.959E+04, 1.592E+05 and 2.123E +05).
Abstract: This paper presents a numerical investigation of pressure recovery and flow uniformity in turning diffusers with 90o angle of turn by varying geometric and operating parameters. The geometric and operating parameters considered in this study are area ratio (AR= 1.6, 2.0 and 3.0) and inflow Reynolds number (Rein=23, 2.653E+04, 7.959E+04, 1.592E+05 and 2.123E+05). Three turbulence models, i.e. the standard k-e turbulence model (std k-e), the shear stress transport model (SST-k-W) and the Reynolds stress model (RSM) were assessed in terms of their applicability to simulate the actual cases. The standard k-e turbulence model appeared as the best validated model, with the percentage of deviation to the experimental being the least recorded. Results show that the outlet pressure recovery of a turning diffuser at specified Rein improves approximately 32% by varying the AR from 1.6 to 3.0. Whereas, by varying the Rein from 2.653E+04 to 2.123E+05, the outlet pressure recovery at specified AR turning diffuser improves of approximately 24%. The flow uniformity is considerably distorted with the increase of AR and Rein. Therefore, there should be a compromise between achieving the maximum pressure recovery and the maximum possible flow uniformity. The present work proposes the turning diffuser with AR=1.6 operated at Rein=2.653E+04 as the optimum set of parameters, producing pressure recovery of Cp=0.320 and flow uniformity of su=1.62, with minimal flow separation occurring in the system.

16 citations

Journal ArticleDOI
TL;DR: In this article, Mansour et al. presented numerical investigations of turbulent single-phase and two-phase flows in a horizontal diverging channel (diffuser), extending their previous experimental work.

16 citations


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