Effects of Nozzle Geometry and Diaphragm Location on the Starting Process in a Ludwieg Tube

1973 ◽  
Author(s):  
Leo T. Smith ◽  
Francis Mosnier
Keyword(s):  
Nozzle Geometry ◽  
Ludwieg Tube ◽  
Starting Process

scholarly journals Starting Process of a Supersonic Ludwieg Tube with a Downstream Valve

1978 ◽  
Vol 21 (161) ◽  
pp. 1610-1617 ◽  
Author(s):  
Kazuyasu MATSUO ◽  
Shigetoshi KAWAGOE ◽  
Tatsunori OGAWARA
Keyword(s):  
Ludwieg Tube ◽  
Starting Process

scholarly journals Starting Process of a Supersonic Ludwieg Tube with a Downstream Valve

1978 ◽  
Vol 44 (379) ◽  
pp. 943-949
Author(s):  
Kazuyasu MATSUO ◽  
Sigetoshi KAWAGOE ◽  
Tatsunori OGAWARA
Keyword(s):  
Ludwieg Tube ◽  
Starting Process

Investigation of the starting process in a Ludwieg tube

2007 ◽  
Vol 21 (2) ◽  
pp. 81-98 ◽  
Author(s):  
T. Wolf ◽  
M. Estorf ◽  
R. Radespiel
Keyword(s):  
Ludwieg Tube ◽  
Starting Process

Influence of Torch Nozzle Geometry on Plasma Jet Properties

1997 ◽  
Vol 7 (6) ◽  
pp. 1361-1375 ◽  
Author(s):  
O. H. Chang ◽  
A. Kaminska ◽  
M. Dudeck
Keyword(s):  
Plasma Jet ◽  
Nozzle Geometry

scholarly journals Sensitivity analysis of FDA´s benchmark nozzle regarding in vitro imperfections - Do we need asymmetric CFD benchmarks?

2020 ◽  
Vol 6 (3) ◽  
pp. 78-81
Author(s):  
Michael Stiehm ◽  
Christoph Brandt-Wunderlich ◽  
Stefan Siewert ◽  
Klaus-Peter Schmitz ◽  
Niels Grabow ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Flow Field ◽  
In Silico ◽  
Nozzle Geometry ◽  
Geometrical Imperfection ◽  
Custom Made ◽  
Inlet Conditions ◽  
Silicone Model ◽  
Bench Testing

AbstractModern technologies and methods such as computer simulation, so-called in silico methods, foster the development of medical devices. For accelerating the uptake of computer simulations and to increase credibility and reliability the U.S. Food and Drug Administration organized an inter-laboratory round robin study of a generic nozzle geometry. In preparation of own bench testing experiment using Particle Image Velocimetry, a custom made silicone nozzle was manufactured. By using in silico computational fluid dynamics method the influence of in vitro imperfections, such as inflow variations and geometrical deviations, on the flow field were evaluated. Based on literature the throat Reynolds number was varied Rethroat = 500 ± 50. It could be shown that the flow field errors resulted from variations of inlet conditions can be largely eliminated by normalizing if the Reynolds number is known. Furthermore, a symmetric imperfection of the silicone model within manufacturing tolerance does not affect the flow as much as an asymmetric failure such as an unintended curvature of the nozzle. In brief, we can conclude that geometrical imperfection of the reference experiment should be considered accordingly to in silico modelling. The question arises, if an asymmetric benchmark for biofluid analysis needs to be established. An eccentric nozzle benchmark could be a suitable case and will be further investigated.

scholarly journals GMAW Shielding Gas Flow Optimisation by Refinement of Nozzle Geometry

PRICM ◽  
2013 ◽  
pp. 2131-2137
Author(s):  
S.W. Campbell ◽  
A.M. Galloway ◽  
N.A. McPherson
Keyword(s):  
Gas Flow ◽  
Nozzle Geometry ◽  
Shielding Gas

Research on Nozzle Geometry Measurement with Synchrotron Radiation X-Ray Phase Contrast Imaging Technique

2013 ◽  
Vol 779-780 ◽  
pp. 1007-1014
Author(s):  
Cang Su Xu ◽  
Qi Yuan Luo ◽  
Jian Ma ◽  
Fang Qi ◽  
Yi Fan Xu
Keyword(s):  
Internal Structure ◽  
Light Source ◽  
Flow Dynamics ◽  
Nozzle Geometry ◽  
Contrast Imaging ◽  
X Ray ◽  
Performance And Emission ◽  
Injector Nozzle ◽  
Fuel Atomization ◽  
Geometry Measurement

The performance and emission characteristics of diesel engines are largely governed by fuel atomization and spray processes which in turn are strongly influenced by the flow dynamics inside the injector nozzle. Accurate measurement of the nozzle geometry is important for the study of the flow dynamics. Using the third-generation synchrontron radiation light source of the ShangHai Light Source (SSRF), the research team successfully captured the internal structure images of the single hole nozzle and multi-hole nozzle. According to the captured images, the researchers clearly observed the internal structure of nozzle as well as the sac region. The diameter and length of the nozzles and orifice angle were also be accurately measured.

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