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Schlieren
1.
A Review on
Schlieren Flow Visualization Technique Maryam Kordbacheh Undergraduate Student Supervisor: Dr. Esfehanian 8/4/1389 Faculty of Mechanical Engineering University of Tehran
2.
3.
Technical Considerations
4.
Specialized Schlieren Technique
5.
Comparison to Other
Methods
6.
7.
Flow Visualization Methods
Compressible flows Smoke visualization Particle Shadowgraphs and Schlieren Incompressible flows Dye Shadowgraphs and Schlieren Particles Bubbles Fluorescence, phosphorescence Drop falling on liquid surface
8.
Incompressible Flows Insects
walking on water Normal laminar flow chain dye visualization
9.
Compressible Flows Shadowgraph
Schlieren flow visualization laminar smoke jet
10.
11.
12.
the refractive
index : n = c0/c
13.
For air -
index has a linear relation with density: The higher the density, the slower the light moves
14.
So, any
compressible flow will cause the wave front of light to “turn”.
15.
16.
Density
gradient causes displacement of source image Displaced Image Image
17.
18.
19.
The extra
dimension of color helps to have vector directions in addition to scalars
20.
21.
2nd derivative of
density
22.
Simplest method
23.
Lower contrast
24.
Schlieren
25.
1st derivative of
density
26.
Small increase in
complexity
27.
Increase in contrast
28.
Interferometer
29.
2D quantitative
measurement of n, T, Density
30.
Sum of path
differences < λ/10th
31.
32.
Schlieren Technique in
Application Schlieren for Flight Test
33.
Thanks for your
Attention
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