scholarly journals Numerical Analysis of the Flow through a Centrifugal Impeller by Vortex Distribution Model of a Boundary Layer. 2nd Report, Unsteady Flow passing through the Impeller and its Characteristics.

1993 ◽  
Vol 59 (565) ◽  
pp. 2834-2841
Author(s):  
Hong Gao ◽  
Kyoji Kamemoto
Keyword(s):  
Boundary Layer ◽  
Numerical Analysis ◽  
Unsteady Flow ◽  
Distribution Model ◽  
Centrifugal Impeller ◽  
Flow Through

scholarly journals FUNDAMENTAL CONSIDERATION ON NUMERICAL ANALYSIS OF UNSTEADY FLOW THROUGH SPOOL VALVE

2002 ◽  
Vol 2002 (5-3) ◽  
pp. 929-934
Author(s):  
Toshiyuki HAYASE ◽  
Yupeng XIA ◽  
Atsushi SHIRAI ◽  
Satoru HAYASHI
Keyword(s):  
Numerical Analysis ◽  
Unsteady Flow ◽  
Flow Through ◽  
Spool Valve ◽  
Fundamental Consideration

scholarly journals Numerical Analysis of the Losses in Unsteady Flow through Turbine Stage

2013 ◽  
Vol 03 (04) ◽  
pp. 252-260 ◽  
Author(s):  
Sławomir Dykas ◽  
Włodzimierz Wróblewski ◽  
Dawid Machalica
Keyword(s):  
Numerical Analysis ◽  
Unsteady Flow ◽  
Turbine Stage ◽  
Flow Through

Unsteady Flow Phenomena in Rotating Centrifugal Impeller Passages

1970 ◽  
Vol 92 (1) ◽  
pp. 65-71 ◽  
Author(s):  
E. Lennemann ◽  
J. H. G. Howard
Keyword(s):  
Unsteady Flow ◽  
Secondary Flow ◽  
Centrifugal Impeller ◽  
Bubble Flow ◽  
Hydrogen Bubble ◽  
Visualization Technique ◽  
Rotating Systems ◽  
Flow Phenomena ◽  
Relative Flow ◽  
Zero Flow

The phenomena of unsteady relative flow observed in a centrifugal impeller passage running at part capacity and zero flow are discussed. The mechanisms of passage stall for a shrouded and unshrouded impeller are investigated and a qualitative correlation is developed for the influence of secondary flow and inducer flow on the passage stall. The hydrogen bubble flow visualization technique is extended to higher velocities and rotating systems and provides the method for obtaining the experimental results.

EFFECTS OF BOUNDARY-LAYER THICKNESS ON UNSTEADY FLOW CHARACTERISTICS INSIDE OPEN CAVITIES AT SUBSONIC AND TRANSONIC SPEEDS

2012 ◽  
Vol 19 ◽  
pp. 206-213
Author(s):  
DANG-GUO YANG ◽  
JIAN-QIANG LI ◽  
ZHAO-LIN FAN ◽  
XIN-FU LUO
Keyword(s):  
Boundary Layer ◽  
Unsteady Flow ◽  
Layer Thickness ◽  
Boundary Layer Thickness ◽  
Sound Pressure ◽  
Flow Characteristics ◽  
Open Cavity ◽  
Aerodynamic Noise ◽  
Sustained Oscillation ◽  
Cavity Depth

An experimental study was conducted in a 0.6m by 0.6m wind-tunnel to analyze effects of boundary-layer thickness on unsteady flow characteristics inside a rectangular open cavity at subsonic and transonic speeds. The sound pressure level (SPL) distributions at the centerline of the cavity floor and Sound pressure frequency spectrum (SPFS) characteristics on some measurement positions presented herein was obtained with cavity length-to-depth ratio (L/D) of 8 over Mach numbers (Ma) of 0.6 and 1.2 at a Reynolds numbers (Re) of 1.23 × 107 and 2.02 × 107 per meter under different boundary-layer thickness to cavity-depth ratios (δ/D). The experimental angle of attack, yawing and rolling angles were 0°. The results indicate that decrease in δ/D leads to severe flow separation and unsteady pressure fluctuation, which induces increase in SPL at same measurement points inside the cavity at Ma of 0.6. At Ma of 1.2, decrease in δ/D results in enhancing compressible waves. Generally, decrease in δ/D induces more flow self-sustained oscillation frequencies. It also makes severer aerodynamic noise inside the open cavity.

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