Diffuser (thermodynamics)

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

Diffuser pipe assembly

Abstract: The invention provides a diffuser assembly constructed of internal and external concentrically nested bowl-shaped shells (1, 2) for directing an outward flow of compressed air from a centrifugal compressor impeller to an axially rearward diffused annular flow. The novel diffuser assembly has two concentrically nested bowl-shaped shells (1, 2), each shell having an inner peripheral compressor impeller casing (3, 4) about a central opening, and an outer edge (5, 6). Opposing nested surfaces of the shells have an array of mating grooves (7, 8) separated by abutting seam edges (9) thus defining individual diffuser ducts extending from the compressor impeller casings (3, 4) to the outer shell edges (5, 6) when the shells are secured together. Preferably the seam edges are located on lands (10) extending laterally between adjacent grooves (7, 8) and the lands (10) extend continuously the length of the grooves (7, 8).

Centrifugal compressor or centripetal turbine

Abstract: A diffuser for a centrifugal compressor or a nozzle assembly for a centripetal turbine comprising a pair of axially-spaced walls defining an annular housing open at its inner and outer peripheries and a plurality of vanes extending between the walls and defining therewith, between adjacent vanes, working fluid passages open to the inner and outer peripheries of the housing, each vane being defined by a pair of partitions having a common edge extending between the housing walls adjacent the inner periphery of the housing and spaced apart circumferentially at positions remote from the inner periphery of the housing.

A Method of Test to Obtain Diffuser Data for CFD Modeling of Room Airflow (RP-1009)

Abstract: This study demonstrated how to use two simplified methods, the box and momentum methods, to simulate complex diffusers in room airflow modeling by computational fluid dynamics. The two methods require additional flow information that is not available from product catalogues of diffuser manufacturers. This information includes the distribution of discharge air velocity, box size, and flow direction. This research developed a method of test (MOT) on how to obtain the additional information with minimal effort under the ASHRAE Standard 70-1991.

Two phase flow conditioner for pumping gassy well fluid

Abstract: A centrifugal pump pumps well fluid with a high gaseous content by conditioning the well fluid with a conditioning impeller and conditioning diffuser design for use with gaseous well fluid. The conditioning impellers have vanes that are curved with a leading edge that is rotationally forward and axially below, or upstream, of a trailing edge. The outer end of the leading edge is rotationally forward of the inner end of the leading edge, which forces the well fluid radially inward and mixes the gas and liquids in the well fluid. The conditioning diffusers have blades that are curved with a leading edge that is rotationarily rearward and axially below a trailing edge. The blades are portions of a sphere, with a concaved side receiving well fluid from the conditioning impellers. The spherical shape forces the well fluid radially inward and axially upward.

Welding torch apparatus

Abstract: A welding torch apparatus for use with conventional arc welding torches which have a gooseneck, a gas nozzle with an interior and a longitudinal axis, a first passageway for supplying of both a welding wire to a tip, and gas mixtures to a gas diffuser. The welding torch apparatus comprises a second passageway for selectively introducing into the interior of the gas nozzle, gas mixtures which by-pass the first passageway, so that contact is avoided between gas mixtures passing through the second passageway and gas mixtures and welding wire passing through the first passageway, until the gas mixtures and welding wire enter the interior of the gas nozzle, and wherein gas mixtures passing through the first passageway do not contain oil additions.