Diffuser (thermodynamics)

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

Compressor wheel housing

Abstract: An exemplary compressor wheel housing for a turbocharger compressor wheel includes a substantially cylindrical shroud surface definable with respect to a radial dimension and an axial dimension along a rotational axis of a compressor wheel with an origin coincident with a z-plane of the compressor wheel wherein the axial position of the shroud surface decreases with increasing radial position to a compressor wheel blade outer edge radius and a diffuser surface extending radially outward and axially downward from the cylindrical shroud surface wherein the diffuser surface includes a minimum diffuser surface axial position at a radial position less than about 1.25 times the compressor wheel blade outer edge radius and wherein the diffuser surface includes a greater axial position at a radial position beyond that corresponding to the minimum axial position. Various other exemplary methods, devices, systems, etc., are also disclosed.

Air flow control device with differential pressure sensing assembly and method

Abstract: An air flow control device, such as an air diffuser ( 21 ) with a differential pressure sensing assembly. The diffuser ( 21 ) has a housing ( 29 ) formed for mounting to a supply air conduit ( 22 ) for discharge of supply air ( 54 ) into a room ( 56 ). The differential pressure sensing assembly includes a diffuser-mounted portion ( 41 ) and a detachable sensor portion ( 40 ). The diffuser mounted portion ( 41 ) is provided by a pressure tube ( 42 ) having at least one opening ( 43 ) therein mounted to the housing ( 29 ) with the opening ( 43 ) positioned proximate an area of known cross section to communicate pressure at the opening ( 43 ) to an open distal end ( 46 ) of the tube ( 42 ). The distal end ( 46 ) is secured in a position accessible from a room side ( 51 ) of the housing ( 29 ). The distal end ( 46 ) of the tube ( 42 ) is formed for releasable coupling of the detachable sensor portion ( 40 ) of the differential pressure sensing assembly thereto, and the sensor portion includes a differential pressure measurement device ( 61 ) for measurement of the difference between the supply air pressure in the diffuser ( 21 ) at the known area and the ambient room air pressure. This measurement is made from a room side ( 51 ) of the housing ( 29 ) and allows a determination of the supply air flow rate through the diffuser to be made. A method of measuring air flow rate in an air flow control device ( 21 ) is also disclosed.

System for diffusing bleed air flow

Abstract: In one aspect, the present disclosure is directed an apparatus configured to diffuse a flow of bleed air. The apparatus having an inlet collar configured to receive the flow of bleed air in a direction substantially along a longitudinal axis of the apparatus. The apparatus further having an end wall longitudinally spaced apart from the inlet collar and configured to block the flow of bleed air in a direction substantially along the longitudinal axis. The apparatus also having a first diffuser wall spaced concentrically relative to a second diffuser wall, each of the first and second diffuser walls positioned between the inlet collar and the end wall and including a plurality of perforations configured to permit the flow of bleed air to exit the apparatus at an angle relative to the longitudinal axis.

Parallel flow electronically variable orifice for variable assist power steering system

Abstract: A power steering pump includes a housing defining an opening containing a sliding vane rotor, a cam ring and pressure plates located at each axial side of the rotor and having inlet ports connected to a source of low pressure fluid and outlet ports connected to a power steering system. The pressure control valve opens and closes an orifice of constant size connecting the pump outlet to a power steering gear. An electronically variable orifice arranged in parallel with the fixed orifice connects the pump and outlet to the power steering gear. When the control valve opens sufficiently, the pump outlet is connected to the inlet through a diffuser arranged to draw low pressure fluid into a high velocity stream of bypass fluid. Kinetic energy of the stream is used to increase static pressure in the fluid supplied to the pump inlet.

Isolation member for air bag inflator

Abstract: An air bag inflator (10) is actuatable to supply inflation fluid under pressure, through discharge openings (40), into a diffuser chamber (90) and thence through gas outlets (92) into an air bag. An isolation membrane (100) extends across the diffuser chamber (90) between the discharge openings (40) and the gas outlets (92). The isolation membrane (100) is welded to the housing at axially and radially spaced locations (106, 128). When the inflator (10) is not actuated, the isolation membrane (100) blocks fluid flow including the conduction of moisture from the environment around the inflator through the discharge openings (40) and into the interior of the inflator. The isolation membrane (100) has a weakened portion defined by a stress riser (130). When the inflator (10) is actuated, the pressure of the fluid flowing through the discharge openings (40) breaks the isolation membrane (100) at the stress riser (130). The isolation membrane (100) moves to a second location in the diffuser chamber (90) clear of the gas outlets (92) to enable fluid flow out of the diffuser chamber and into the air bag.