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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
30 Apr 1996
TL;DR: In this article, the diverging port is used as the throat of a diffuser to increase volumetric efficiency with respect to the suction gas entering the cylinder bore by extending the point of suction inlet closeoff, and correspondingly enlarging the close-off angle.
Abstract: A suction inlet passage in a cylinder block of a rotary compressor includes a generally symmetrical diverging port which has generally conic cross-sections that divergingly open into a cylinder bore. The diverging port provides a buffer cavity which reduces pulsations and associated noise. The suction inlet passage is further provided with an entrance passage and a narrower passage, which is disposed between the entrance passage and the diverging port and which has a smaller cross-section than either the entrance passage or the diverging port. The suction inlet passage serves as a diffuser with the narrower passage functioning as the throat of the diffuser so as to increase volumetric efficiency with respect to the suction gas entering the cylinder bore. The diverging port extends the point of suction inlet close-off, and correspondingly enlarges the close-off angle, resulting in extending the period of unclosed compression and enhancing the supercharging effect. In this manner, the improved suction inlet passage increases volumetric efficiency, reduces pulsations and associated noise, and increases the pressure of the suction gas in the cylinder bore at the beginning of the compression cycle.

16 citations

Journal ArticleDOI
TL;DR: In this article, the authors presented a new approach to predict the internal state of piezo driven diffuser/nozzle micropump at any instant of time, considering the damping effect.

16 citations

Patent
10 Sep 2009
TL;DR: A high efficiency, multi-stage centrifugal pump and method of assembly is described in this paper. But, it is not shown how to construct a three-stage pump with a flow rate between about 300 liters per second and about 500 liter per second with an efficiency between 86% and 91%.
Abstract: A high-efficiency, multi-stage centrifugal pump and method of assembly. The pump can include three pump stages with each one of the three pump stages including a front casing, a back casing, an impeller, and a bladed diffuser. The front casing and the back casing are removeably coupled around the impeller and the bladed diffuser. In the three-stage pump, the fluid can be pumped at a flow rate between about 300 liters per second and about 500 liters per second with an efficiency between about 86% and about 91%. The method includes separately casting, machining, and polishing each one of the front casing, the back casing, the impeller, and the bladed diffuser.

16 citations

Journal ArticleDOI
TL;DR: In this article, the authors measured the incompressible flow at the exit of a large-scale 90-degree curved diffuser with strong curvature and significant streamwise variation in the cross-section aspect ratio.
Abstract: We present detailed measurements of the incompressible flow at the exit of a large-scale 90-degree curved diffuser with strong curvature and significant streamwise variation in the cross-section aspect ratio. The diffuser flow path approximates the so-called fish-tail diffuser utilized on small gas turbine engines for the transition between the centrifugal impeller and the combustion chamber. Five variations of the inlet boundary layer are considered. The results provide insight into several aspects of the diffuser flow including: the effect of flow turning on diffusion performance; the dominant structures influencing the flow development in the diffuser; and the effect of the inlet boundary layer integral parameters on the diffusion performance and the exit velocity field. The three-dimensional velocity distribution at the diffuser exit is found to be sensitive to circumferentially uniform alterations to the inlet boundary layer. In contrast, circumferential variations in the inlet boundary layer are observed to have only secondary effects on the velocity field at the diffuser exit. The static pressure recovery is observed to be comparable to the published performance of conical diffusers with equivalent included angle and area ratios.

16 citations

Patent
16 Mar 2011
TL;DR: An apparatus for generating electricity using water flow in a body of water comprises: an array of spaced apart elements Each element defines an elongate flow passage and has an upstream side and an elgonate downstream side, each element being provided with a series of holes spaced along its length and the downstream side extending and tapering away in the direction of flow as mentioned in this paper.
Abstract: An apparatus for generating electricity using water flow in a body of water comprises: an array of spaced apart elements Each element defines an elongate flow passage and has an upstream side and an elgonate downstream side, each element being provided with a series of holes spaced along its length and the downstream side extending and tapering away in the direction of flow The elements are arranged side by side such that opposing walls of adjacent elements define a venturi section and a first diffuser section extending downstream from the venturi section The apparatus also comprises: - a flow conduit having an inlet and an outlet; - a turbine located in the flow conduit; and - a generator connected to the turbine; The flow passages are connected to the outlet of the flow conduit such that the flow of water through the venturi sections causes water to be drawn through the flow conduit out via the holes the resulting flow driving the turbine

16 citations


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