Magnetohydrodynamic Vortex Containment, Part 3: 1-D Axisymmetric Flow Model

2007 ◽  
Vol 23 (2) ◽  
pp. 404-413
Author(s):  
Raymond J. Sedwick ◽  
Daniel A. Zayas
Keyword(s):  
Flow Model ◽  
Axisymmetric Flow

Nonuniform Flow in a Compressor Due to Asymmetric Tip Clearance

2000 ◽  
Vol 122 (4) ◽  
pp. 751-760 ◽  
Author(s):  
Seung Jin Song ◽  
Seung Ho Cho
Keyword(s):  
Analytical Study ◽  
Flow Model ◽  
Axisymmetric Flow ◽  
Tip Clearance ◽  
Linear Perturbation ◽  
Flow Variable ◽  
Nonuniform Flow ◽  
Downstream Flow ◽  
Perturbation Approximation ◽  
Flow Nonuniformity

This paper presents an analytical study of flow redistribution in a compressor stage due to asymmetric tip clearance distribution. The entire stage is modeled as an actuator disk and it is assumed that upstream and downstream flow fields are determined by the local tip clearance. The flow is assumed to be inviscid and incompressible. First, an axisymmetric flow model is used to connect upstream and downstream flows. Second, a linear perturbation approximation is used for nonaxisymmetric analysis in which each flow variable is assumed to consist of a mean (axisymmetric value) plus a small perturbation (asymmetric value). Thus, the perturbations in velocity and pressure induced by the tip clearance asymmetry are predicted. Furthermore, rotordynamic effects of such flow nonuniformity are examined as well. [S0889-504X(00)01404-5]

Non-Uniform Flow in a Compressor due to Asymmetric Tip Clearance

2000 ◽  
Author(s):  
Seung Jin Song ◽  
Seung Ho Cho
Keyword(s):  
Analytical Study ◽  
Flow Model ◽  
Axisymmetric Flow ◽  
Tip Clearance ◽  
Linear Perturbation ◽  
Flow Variable ◽  
Compressor Stage ◽  
Actuator Disc ◽  
Downstream Flow ◽  
Perturbation Approximation

This paper presents an analytical study of flow redistribution in a compressor stage due to asymmetric tip clearance distribution. The entire stage is modeled as an actuator disc, and it is assumed that upstream and downstream flow fields are determined by the local tip clearance. The flow is assumed to be inviscid and incompressible. First, an axisymmetric flow model is used to connect upstream and downstream flows. Second, a linear perturbation approximation is used for non-axisymmetric analysis in which each flow variable is assumed to consist of a mean (axisymmetric value) plus a small perturbation (asymmetric value). Thus, the perturbations in velocity and pressure induced by the tip clearance asymmetry are predicted. Furthermore, rotordynamic effects of such flow non-uniformity are examined as well.

scholarly journals Nozzle Shape Optimization for an MPD Thruster Using a Two-Dimensional Axisymmetric Flow Model

2011 ◽  
Vol 59 (687) ◽  
pp. 90-96 ◽  
Author(s):  
Masakatsu NAKANE ◽  
Masao NAGAO ◽  
Yoshio ISHIKAWA ◽  
Kenichi KUBOTA ◽  
Ikkou FUNAKI
Keyword(s):  
Shape Optimization ◽  
Flow Model ◽  
Axisymmetric Flow ◽  
Two Dimensional ◽  
Nozzle Shape

Investigation of drop's instability under different transition stages on axisymmetric flow model

2020 ◽  
Vol 210 ◽  
pp. 104673
Author(s):  
Pardeep Bishnoi ◽  
S. Jeeva Chithambaram ◽  
Abhijeet Singh ◽  
Prabhat Kumar ◽  
S.K. Khatkar ◽  
...  
Keyword(s):  
Flow Model ◽  
Axisymmetric Flow ◽  
Transition Stages

An Analytical Model of Flow-Induced Rotordynamic Forces in Shrouded Centrifugal Pump Impellers

2016 ◽  
Author(s):  
Jieun Song ◽  
Seung Jin Song
Keyword(s):  
Flow Model ◽  
Axisymmetric Flow ◽  
Flow Fields ◽  
Industrial Applications ◽  
Operating Conditions ◽  
Centrifugal Pumps ◽  
Impeller Blade ◽  
Inlet Flow ◽  
Pump Test ◽  
Rotordynamic Forces

Shrouded centrifugal pumps are widely used in industrial applications such as process machines, and they can suffer from rotordynamic instability. Eccentric shrouded impellers induce non-axisymmetric flow fields which, in turn, lead to rotordynamic forces. Therefore, a new analytical flow model for shrouded pump impellers (which considers non-axisymmetric flow fields in the upstream inlet duct, shrouded impeller, and downstream) has been developed using an actuator disk approach. The model can predict impeller rotordynamic stiffness values from pump geometry and operating conditions. When compared to the available pump test data [1], the new model’s predicted stiffness coefficients agree well with the measured data. The new model’s predictions show the strong influence of the non-axisymmetric shroud inlet flow on the rotordynamic stiffness forces. The shroud inlet flow non-axisymmetry, in turn, results from the non-axisymmetric flows upstream of and inside the impeller blade passage induced by impeller eccentricity.

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