scholarly journals Analysis of flow through channel with mounted blades

2018 ◽  
Vol 240 ◽  
pp. 03012
Author(s):  
Łukasz Semkło ◽  
Łukasz Gierz
Keyword(s):  
Numerical Analysis ◽  
Flow Velocity ◽  
Flow Through Channel ◽  
Flow Through

Numerical analysis of parts of the installation for transporting the mixture. The mixture consists of sand, stones and water. The analysis concerns the possibility of reducing the flow velocity of the mixture in the installation by means of installing the blades. The article presents an analysis of 10 blades that have been simulated. Speed distributions are presented after passing through the blades and determined which slows the speed of the mixture to the best possible extent.

Flow through axial-flow-turbomachinery blading

2018 ◽  
Author(s):  
Marcel Escudier
Keyword(s):  
Flow Velocity ◽  
Compressible Flow ◽  
Dimensional Analysis ◽  
Incompressible Flow ◽  
Compressible Fluid ◽  
Axial Flow ◽  
Linear Cascade ◽  
Dimensional Parameters ◽  
Flow Through

This chapter is concerned primarily with the flow of a compressible fluid through stationary and moving blading, for the most part using the analysis introduced in Chapter 11. The principles of dimensional analysis are applied to determine the appropriate non-dimensional parameters to characterise the performance of a turbomachine. The analysis of incompressible flow through a linear cascade of aerofoil-like blades is followed by the analysis of compressible flow. Velocity triangles for flow relative to blades, and Euler’s turbomachinery equation, are introduced to analyse flow through a rotor. The concepts introduced are applied to the analysis of an axial-turbomachine stage comprising a stator and a rotor, which applies to either a compressor or a turbine.

Numerical Analysis of Leakage Flow Through Two Labyrinth Seals

2007 ◽  
Vol 19 (1) ◽  
pp. 107-112 ◽  
Author(s):  
Wei-zhe Wang ◽  
Ying-zheng Liu ◽  
Pu-ning Jiang ◽  
Han-ping Chen
Keyword(s):  
Numerical Analysis ◽  
Leakage Flow ◽  
Labyrinth Seals ◽  
Flow Through

Forces on Unstaggered Airfoil Cascades in Unsteady In-Phase Motion

1976 ◽  
Vol 98 (3) ◽  
pp. 521-530 ◽  
Author(s):  
N. H. Kemp ◽  
H. Ohashi
Keyword(s):  
Flow Velocity ◽  
Incompressible Flow ◽  
Kutta Condition ◽  
Harmonic Motion ◽  
Thin Airfoil ◽  
Through Flow ◽  
Flow Through ◽  
Unsteady Effects ◽  
Analytical Expressions ◽  
Phase Motion

Incompressible flow through an unstaggered cascade in general, unsteady, in-phase motion is considered. By methods of thin-airfoil theory, using the assumptions of wakes trailing back at the through-flow velocity, and the Kutta condition, exact analytical expressions are derived for loading, lift and moment. As application, harmonic motion is considered for plunging, pitching, and sinusoidal gusts. Numerical values of lift and moment for these three cases are given graphically (tables are available from the authors). The results show strong analogies with isolated unsteady thin-airfoil theory. They should prove useful as simple examples of unsteady effects in cascades, and as check cases for other approximate or purely numerical analyses.

Numerical Analysis of Blood Flow Through Artery with Elastic Wall of a Vessel

2016 ◽  
pp. 193-200 ◽  
Author(s):  
Wojciech Wolański ◽  
Bożena Gzik-Zroska ◽  
Kamil Joszko ◽  
Marek Gzik ◽  
Damian Sołtan
Keyword(s):  
Blood Flow ◽  
Numerical Analysis ◽  
Elastic Wall ◽  
Flow Through

Abstract W P211: Investigating the Cause for “Collateral Failure” in Stroke-in-Progression: Intracranial Pressure Elevation Reduces Flow Through Collateral Vessels

Stroke ◽  
2014 ◽  
Vol 45 (suppl_1) ◽  
Author(s):  
Daniel Beard ◽  
Damian McLeod ◽  
Neil J Spratt
Keyword(s):  
Intracranial Pressure ◽  
Flow Velocity ◽  
Cerebral Perfusion ◽  
Perfusion Pressure ◽  
Minor Stroke ◽  
Collateral Flow ◽  
Mca Occlusion ◽  
Intracranial Pressure Elevation ◽  
Flow Through ◽  
Collateral Vessels

Background: Adequacy of the collateral circulation is a major determinant of outcome in stroke patients. Recent human imaging data indicates that collateral failure, rather than reperfusion-reocclusion is the most common cause for early progression in minor stroke. Our previous experimental data shows that intracranial pressure (ICP) rises transiently 24 h after even minor stroke. Herein, we investigated the effect of ICP manipulation on blood flow through collateral vessels during MCA occlusion. Methods: We developed and validated a method to quantify flow velocity and vessel diameter of anterior-middle cerebral artery (ACA-MCA) leptomeningeal collaterals in rats during stroke, using fluorescent microspheres. BIood flow velocity and diameter was quantified in individual collateral vessels and used to calculate absolute flow during MCA occlusion and reperfusion (n = 6). In separate experiments, ICP was increased after MCA occlusion by fluid infusion into the lateral ventricles and effects on relative collateral flow were determined (n = 4). Results: In vitro validation indicated accurate flow quantification (R 2 = 0.99, P<0.0001). Collateral flow was seen to switch from bidirectional to unidirectional flow (toward occluded vessel) and increase by 595 ± 134 % within 10 min of vessel occlusion. Direction and flow changes were variable after MCA reperfusion, however there was a mean flow reduction of 52 ± 15 % by 5 mins. Artificially elevating ICP during MCA occlusion caused a reduction of cerebral perfusion pressure which was strongly correlated with collateral flow reduction (R 2 = 0.90, p<0.0001). Discussion: Our method permits real time quantification of flow through individual collateral vessels during stroke and reperfusion. Intracranial pressure elevation reduced collateral flow, proportional to its effect on cerebral perfusion pressure. Coupled with our previous data indicating significant ICP elevation after even minor stroke, this suggests that transient ICP elevation is the possible cause of the collateral failure recently described in patients with stroke-in-progression.

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