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Venturi Rohr

Venturi Rohr. d. 2. 1. Gemessen: p 1 , p 2 , D, d. Rohr horizontal T=20 o. Gesucht: Q. Lösung: Kontinuität und Bernoulli. Geschwindigkeitsmessung. Hydrometrischer Flügel. Tracer Methoden. t 1. t 2. L. Verfahren zur Messung von Q: Verdünnungsmethode. Andere Methoden.

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Venturi Rohr

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  1. Venturi Rohr d 2 1 Gemessen: p1, p2, D, d Rohr horizontal T=20o Gesucht: Q Lösung: Kontinuität und Bernoulli

  2. Geschwindigkeitsmessung

  3. Hydrometrischer Flügel

  4. Tracer Methoden t1 t2 L Verfahren zur Messung von Q: Verdünnungsmethode

  5. Andere Methoden • Laserdoppleranemometer: In der Strömung vorhandene Kleinstpartikel durchlaufen ein Interferenzmuster an der Schnittstelle zweier Laserstrahlen. • MID (Magnetisches Induktions-Verfahren): In einem durch ein Magnetfeld bewegten Leiter (= Strömung) wird eine Spannung induziert • Akustische Laufzeitmessung: Superposition von Schallgeschwindigkeit und Strömungsgeschwindigkeit

  6. Magnetisch Induktiver Durchflussmesser(MID)

  7. Punktmesssungen

  8. Cup- und Propeller Anemometer

  9. Sonic (1)

  10. Sonic (2)

  11. Anwendung von Cup‘s & Sonic‘s

  12. LiDAR (Light Detecting And Ranging)(1)

  13. Lidar (2)

  14. ADV

  15. Hot-wire (1)

  16. Hot-wire (2)

  17. Hot-wire (3)

  18. Laser-Cantilever (1)

  19. Laser-Cantilever (2)

  20. ‚Whole field‘ Messungen

  21. PIV (0)

  22. PIV (0)

  23. PIV (1)

  24. PIV (2)

  25. PIV (3)

  26. PIV (4)

  27. PIV (5)

  28. Surface drifters

  29. Deep ocean floats

  30. PTV (1)

  31. PTV (2)

  32. PTV (3) r(x,y,z,t) Camera 4 Camera 1 z y Camera 3 Camera 2 x from 2D to 3D position

  33. PTV (4): camera callibration • teach the cameras with know grid points • problem: how to have space filling target? • solution in part: callibration on flow tracers

  34. PTV (5): fast digital cameras pixel: 1024x1000 frame rate: 7500Hz or pixel: 250x250 frame rate: 80’000Hz pixel: 500x500 frame rate: 50Hz data storage is main bottelneck

  35. PTV (6): flow tracers high tech, accurate, expensive: low tech, accurate, cheap: Idea: Søren Ott & Jakob Mann, Risø, Denmark fly ashsieving50-60µm

  36. PTV (7): illumination LED array, TU/e Lorenzo del Castello, Herman Clercx trend towards smarter solutions

  37. PTV (8): tracking tracking criteria: particle must not travel further than their typical spacing codes available at http://ptv.origo.ethz.ch/

  38. PTV (9): many choices… flow speed camera recording rate illumination trackability particle diameter flow scales one would like to resolve number of tracer particles camera pixel resolution field of view optical working distance depth of view

  39. PTV (10): final output

  40. Open source development on origo

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