A wave‐vector–time‐domain technique to determine the transient acoustic radiation loading on cylindrical vibrators in an inviscid fluid with axial flow

1991 ◽  
Vol 89 (1) ◽  
pp. 39-51 ◽  
Author(s):  
D. D. Ebenezer ◽  
Peter R. Stepanishen
Keyword(s):  
Wave Vector ◽  
Time Domain ◽  
Acoustic Radiation ◽  
Axial Flow ◽  
Inviscid Fluid

Acoustic radiation loading on cylindrical vibrators in an inviscid fluid with axial flow

1990 ◽  
Vol 87 (S1) ◽  
pp. S74-S74
Author(s):  
D. D. Ebenezer ◽  
Peter R. Stepanishen
Keyword(s):  
Acoustic Radiation ◽  
Axial Flow ◽  
Inviscid Fluid

Analysis of acoustic radiation mode in time domain

2009 ◽  
Vol 52 (8) ◽  
pp. 2384-2390 ◽  
Author(s):  
WeiGuo Wu
Keyword(s):  
Time Domain ◽  
Acoustic Radiation ◽  
Radiation Mode

Blocking in the Rotating Axial Flow in a Corotating Flexible Shell

2008 ◽  
Vol 76 (1) ◽  
Author(s):  
F. Gosselin ◽  
M. P. Païdoussis
Keyword(s):  
Traveling Waves ◽  
Physical Phenomenon ◽  
Axial Flow ◽  
Critical Value ◽  
Inviscid Fluid ◽  
Shell Wall ◽  
Stagnation Region ◽  
Linear Dynamics ◽  
Shell Equations ◽  
Rotating Cylindrical Shell

By coupling the Donnell–Mushtari shell equations to an analytical inviscid fluid solution, the linear dynamics of a rotating cylindrical shell with a corotating axial fluid flow is studied. Previously discovered mathematical singularities in the flow solution are explained here by the physical phenomenon of blocking. From a reference frame moving with the traveling waves in the shell wall, the flow is identical to the flow in a rigid varicose tube. When the ratio of rotation rate to flow velocity approaches a critical value, the phenomenon of blocking creates a stagnation region between the humps of the wall. Since the linear model cannot account for this phenomenon, the solution blows up.

A time-domain millimeter-wave vector network analyzer

1992 ◽  
Vol 2 (8) ◽  
pp. 319-321 ◽  
Author(s):  
R.Y. Yu ◽  
J. Pusl ◽  
Y. Konishi ◽  
M. Case ◽  
M. Kamegawa ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Wave Vector ◽  
Time Domain ◽  
Vector Network Analyzer ◽  
Network Analyzer

Computational Modeling and Validation Testing of Dynamic Blade Stresses in a Rotating Centrifugal Compressor Using a Time Domain Coupled Fluid-Structure Computational Model

2010 ◽  
Author(s):  
Andrew Lerche ◽  
J. Jeffrey Moore ◽  
Yusheng Feng
Keyword(s):  
Computational Model ◽  
Centrifugal Compressor ◽  
Time Domain ◽  
Axial Flow ◽  
High Gain ◽  
Open Loop ◽  
Low Noise ◽  
Future Research ◽  
Fluid Structure ◽  
Compressor Rotor

This work develops a time domain coupled fluid-structure computational model that predicts dynamic blade stresses in a rotating centrifugal compressor. Although, much research has been performed on axial flow turbomachinery, little has been published for radial machines such as centrifugal compressors and radial inflow turbines. This research develops a time domain coupled fluid-structure computational model using commercially available codes. The model couples the codes unidirectionally, where pressures are transferred to the structural code during the transient solution, and the fluid mesh remains unaffected by the structural displacements. Models are developed for the compressor at blade resonant conditions. The model is then validated with a rotating test of a centrifugal compressor instrumented with blade mounted strain gauges. The test rig is an open loop rig that utilizes an unshrouded centrifugal compressor with a vaneless diffuser. The strain gauge signals are passed through a high gain, low noise amplifier that is mounted on the compressor rotor. This work not only develops a unidirectionally coupled fluid-structure model capable of predicting dynamic strains, but also provides valuable experimental data that can be used for future research and validation cases of fluid-structure interaction (FSI) models.

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