Diffuser (sewage)

About: Diffuser (sewage) is a research topic. Over the lifetime, 6487 publications have been published within this topic receiving 40404 citations.

Variable diffuser wall with ribbed vanes

Abstract: An improved diffuser is provided for centrifugal compressors and the like. The diffuser has a movable wall to which is attached a plurality of ribbed vanes.

Porous membrane material and air diffuser

Abstract: PROBLEM TO BE SOLVED: To provide a porous membrane material from which minute air bubbles can be generated uniformly and the efficiency of which when air bubbles are dispersed in sewage is improved. SOLUTION: The porous membrane material 1 has an air bubble generating membrane part 3 which has many small through-holes 2 and is made from an elastic body. Minute air bubbles are generated uniformly from the whole surface of the porous membrane material by setting small through-holes 2 in each portion of the air bubble generating membrane part 3 of the porous membrane material 1 so that the inside diameters, lengths or density of small through-holes to be arranged in one portion are made different from the inside diameters, lengths or density of those to be arranged in another portion. A hydrophilicity imparting agent-coated layer is formed on the front surface 3a of the air bubble generating membrane part 3. COPYRIGHT: (C)2007,JPO&INPIT

Numerical Quantification of Interaction Effects in a Closely-Coupled Diffuser-Fan System

Abstract: Distorted inflow conditions have been a plague for compression system operability and aeromechanics since the dawn of gas turbine engines. This will likely continue to be an issue for all systems, but modern inlet designs, particularly serpentine diffusers, accentuate the existing issues through the production of both total pressure deficits and flow angularity distortion. For the first time, unsteady, full annulus CFD analysis of a coupled diffuser-fan system was pursued to determine coupling effects between the serpentine diffuser and transonic fan stage. Additionally, the harmonic balance method was used for the first time to demonstrate development and transfer of the distortion. These efforts provided a novel demonstration of 3-D analysis using a generated distortion relevant to this class of inlet and engine. Prior distortion analyses have been conducted using prescribed inlet distortion fields typically matching experimental total pressure or bulk swirl profiles. In the present study, an offset serpentine diffuser was used, coupled directly with the fan stage, to generate the distortion pattern. The Star-CCM+ solver was used to complete mixing-plane, harmonic balance, and transient, full annulus simulations of the coupled system. Mixing plane analysis provided a computationally inexpensive way to assess a nominal mass flow rate at which the components were matched, but provided little additional information beyond a flow field initialization for the higher-fidelity methods. The ability of any distortion analysis method to compute the generation of total temperature and swirl distortion through the fan stage is critical. The harmonic balance and full annulus results show appropriate capture of the distortion transfer, generation of intra-stage total temperature distortion, as well as the impact of the turbomachinery upon the incoming flow field. Redistribution of the distorted flow entering the fan was captured reasonably well by the harmonic balance simulation. Entering the rotor region, however, the vortices

Diffuser assembly with buoyancy vessel

Abstract: A diffuser assembly with a buoyancy vessel and a chamber for buoyantly raising the diffuser assembly for maintenance work. The diffuser assembly has a support structure, diffusers connected to the frame, and a buoyancy vessel positioned on the frame, capable of alternating between a state of buoyancy or ballast.