Diffuser (thermodynamics)

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

Effects of Diffuser Vane Geometry on Interaction Noise Generated from a Centrifugal Compressor

Abstract: The characteristics of interaction tone noise radiated from a centrifugal compressor with a vaned diffuser are discussed by experiments, including visualization techniques using the oil-film method. Research attention is paid to the leading edge geometries of the diffuser vanes that are deeply related to the generation mechanism of the interaction tone noise. The compressor-radiated noise can be reduced by several decibels by setting some clearances in both the hub and shroud surfaces of the diffuser wall along with some decline in the pressure-rise coefficient. Since the decline turned out to be caused by the flow impingement and also by the secondary flow within the diffuser passages, several new types of diffuser vane geometries which do not detract from both the performance and noise level are developed and utilized for the experiments. The presented diffuser vane geometries will offer a few basic guidelines for the diffuser vane design.

Method and apparatus for increasing the efficiency of a refrigeration system

Abstract: A refrigeration system utilizing a vortex generator and a diffuser to reduce the pressure differential between the head pressure and suction pressure across a compressor

Flow dynamics at the minimum starting condition of a supersonic diffuser to simulate a rocket’s high altitude performance on the ground

Abstract: A numerical analysis was conducted to investigate and characterize the unsteadiness of the flow structure and oscillatory vacuum pressure inside of a supersonic diffuser equipped to simulate high-altitude rocket performance on the ground. A physical model including a rocket motor, vacuum chamber, and diffuser, which have axisymmetric configurations was employed. Emphasis was placed on investigating the physical phenomena of very complex and oscillatory flow evolutions in the diffuser operating very close to the starting condition, i.e. at a minimum starting condition, which is one of the major important parameters from a diffuser design point of view.

Fluid flow conditioner

Abstract: A fluid flow conditioning plate (10) for removing swirl, etc. from an enclosed water stream especially for a fire fighting nozzle. The plate has circular holes lying on concentric circles (11, 12, 13). Two cross-sectional shapes for the holes are suggested. They may have a short upstream end tapering inwardly in the direction of the flow then a substantially longer portion of constant cross section and finally a short downstream end tapering outwardly in the direction of the flow. In the alternative the portion of constant cross section is shortened to accommodate a longer downstream end portion, of conical or trumpet shape, which acts as a diffuser. Various examples of ratios of hole to plate diameters, etc. are given as are examples of fog nozzles incorporating flow conditioners.