Prediction of flow through swirl generator and validation by measured data

From measured data are determined permeability parameters of thick perforated foam samples, used as car seats cushions. Parameters are used for numerical flow simulations in foam samples. Model of detailed geometry gives good view about detailed flow field (pressure and velocity) in foam volume, influenced by perforations and grooves. However, simulated flow is several times different from measured one. The main flow is through perforations (99%) and flow through foam is of two orders lower. Using homogenous geometry with “averaged” permeability parameters, evaluated from measured values, the coincidence of measured and simulated flow is very good, difference of 1-5%. However, it is not possible to get any details of flow in foam volume. Using inlet layer, the flow is decreasing, first in perforations and the ratio between perforation and foam flows is more balanced.

Download Full-text

Investigations on Transonic Flow of Super-Critical CO2 Through Carbon Ring Seals

Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy ◽

10.1115/gt2015-42486 ◽

2015 ◽

Author(s):

Eike Hylla ◽

Markus Schildhauer ◽

Richard Büssow ◽

Kolja Metz ◽

Robert Klawes

Keyword(s):

Test Procedure ◽

Measured Data ◽

Temperature Deformation ◽

Experimental Investigations ◽

Real Gas ◽

Real Gas Effect ◽

Flow Through ◽

Co2 Flow ◽

Gas Effect ◽

Good Agreement

This paper gives an overview of numerical and experimental investigations on super-critical CO2 flow through carbon floating ring seals (CRS). The established simulation model considers the real gas effect, temperature deformation and the shaft rotation. For validation extensive measurements of the leakage rates, pressures and temperatures at various positions within the seal were conducted on a compressor prototype. Details of the measurement setup and the test procedure are given. The experimental results are discussed. A comparison of the measured data to the model prediction shows an overall good agreement.

Download Full-text

Large eddy simulation of the flow through the blades of a swirl generator

International Journal of Heat and Fluid Flow ◽

10.1016/s0142-727x(00)00058-8 ◽

2000 ◽

Vol 21 (5) ◽

pp. 664-673 ◽

Cited By ~ 13

Author(s):

Stephen Conway ◽

Doru Caraeni ◽

Laszlo Fuchs

Keyword(s):

Large Eddy Simulation ◽

Eddy Simulation ◽

Swirl Generator ◽

Large Eddy ◽

Flow Through

Download Full-text

Flow Investigations on Swirling Compressible Flow Through a Vaneless Radial Diffuser

Volume 1: Turbomachinery ◽

10.1115/87-gt-193 ◽

1987 ◽

Author(s):

D. P. Agrawal ◽

S. M. Yahya ◽

D. N. Reddy

Keyword(s):

Mach Number ◽

Compressible Flow ◽

Performance Parameters ◽

Flow Angle ◽

Swirl Generator ◽

Swirl Angle ◽

Inlet Swirl ◽

Flow Through ◽

Swirl Vane ◽

Nozzle Type

The present study deals with the experimental investigation of Swirling compressible flow through a parallel walled vaneless radial diffuser. Swirl generator of vortex nozzle type is used for supplying swirling compressible flow at the diffuser inlet up to a Mach number of 0.8. The desired flow angles are achieved by adjusting inlet swirl vane setting angles from 2.5° to 12.5°. The results are presented in terms of performance parameters such as pressure recovery and loss coefficient for various diffuser inlet Mach numbers from 0.3 to 0.8 and flow angle range from 20° to 35°. The effect of Mach number and swirl angle on the performance of the vaneless radial diffuser are discussed.

Download Full-text

Numerical analysis of multiphase flow through axial vortex tube cyclone separators

E3S Web of Conferences ◽

10.1051/e3sconf/201912806010 ◽

2019 ◽

Vol 128 ◽

pp. 06010

Author(s):

Gopalakrishnan B ◽

Arul Prakash K

Keyword(s):

Vortex Tube ◽

Stokes Equations ◽

Swirling Flow ◽

Combustion Engine ◽

Numerical Study ◽

Dust Particles ◽

Navier Stokes ◽

Swirl Generator ◽

Discrete Phase ◽

Flow Through

Axial cyclone separators are used as primary filtration components in many internal combustion engine applications. A numerical study of gas-solid flow through an axial cyclone separator is carried out by Eulerian-Lagrangian CFD approach, which uses discrete phase modelling (DPM) of particles and solution of incompressible turbulent Navier-Stokes equations with RNG k—ɛ closure model. The effective filtration of inlet air from dust particles is an important requirement for prolonged engine life cycle. In axial cyclone separators, a helical swirl generator is used for imparting swirling motion to theparticle laden flow and particles are filtered by centrifugal separation and then scavenged using a vortex tube. In the present work, the modelling done in OpenFOAM successfully captures the features of the swirling flow, along with particle–gas and particle–wall interactions for a varying size distribution at the inlet. Studies were aimed at analysing the effect of particles and its effect on improving the performance of the filter.

Download Full-text

Numerical simulation of the flow through the blades of a swirl generator

Applied Mathematical Modelling ◽

10.1016/j.apm.2015.07.018 ◽

2016 ◽

Vol 40 (2) ◽

pp. 1247-1259 ◽

Cited By ~ 7

Author(s):

M. Wannassi ◽

F. Monnoyer

Keyword(s):

Numerical Simulation ◽

Swirl Generator ◽

Flow Through

Download Full-text

Development of apical pits in chloride cells of the gills of Pimephales promelas after chronic exposure to acid water

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100076044 ◽

1983 ◽

Vol 41 ◽

pp. 462-463

Author(s):

Richard L. Leino ◽

Jon G. Anderson ◽

J. Howard McCormick

Keyword(s):

Confidence Interval ◽

Chronic Exposure ◽

Lake Superior ◽

Pimephales Promelas ◽

Chloride Cells ◽

Fathead Minnows ◽

Secondary Lamellae ◽

Untreated Water ◽

Water Ph ◽

Flow Through

Groups of 12 fathead minnows were exposed for 129 days to Lake Superior water acidified (pH 5.0, 5.5, 6.0 or 6.5) with reagent grade H2SO4 by means of a multichannel toxicant system for flow-through bioassays. Untreated water (pH 7.5) had the following properties: hardness 45.3 ± 0.3 (95% confidence interval) mg/1 as CaCO3; alkalinity 42.6 ± 0.2 mg/1; Cl- 0.03 meq/1; Na+ 0.05 meq/1; K+ 0.01 meq/1; Ca2+ 0.68 meq/1; Mg2+ 0.26 meq/1; dissolved O2 5.8 ± 0.3 mg/1; free CO2 3.2 ± 0.4 mg/1; T= 24.3 ± 0.1°C. The 1st, 2nd and 3rd gills were subsequently processed for LM (methacrylate), TEM and SEM respectively.Three changes involving chloride cells were correlated with increasing acidity: 1) the appearance of apical pits (figs. 2,5 as compared to figs. 1, 3,4) in chloride cells (about 22% of the chloride cells had pits at pH 5.0); 2) increases in their numbers and 3) increases in the % of these cells in the epithelium of the secondary lamellae.

Download Full-text