Abstract
Visualization of aerodynamic effects on a three-dimensional double-delta wing aircraft model was conducted using an optical pressure measurement system, based on the Pressure Sensitive Paint (PSP) technique, and in addition a laser-light sheet method. The combination of PSP technology with the laser-light sheet method, provides a good understanding of the flow around the wind tunnel model. In recent years, this novel PSP-technology has attracted considerable attention in the aerospace community. The PSP technique can be used to realize absolute pressure measurements on a surface of a model and in addition to evaluate quantitative aerodynamic flow phenomena using a scientific grade camera and image processing techniques. The PSP system was tested in the Transonic Wind Tunnel of the German Aerospace Center in Göttingen (TWG) under real flow conditions. Instantaneous pressure distributions are recorded in almost real-time so that the recognition and analysis of the vortex dynamics on the model surface is possible. Even the vortex breakdown process, as well as the fine structured Kelvin-Helmholtz instabilities and secondary vortex structures, can be detected by this measurement technique.
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Abbreviations
- I :
-
photoluminescence intensity
- K q :
-
quenching constant
- PO 2 :
-
partial pressure of oxygen
- p :
-
local static pressure
- A,B,C :
-
calibration coefficients of a paint
- t :
-
response time
- l :
-
thickness of the binder layer
- D :
-
diffusion coefficient of oxygen
- Λ:
-
aspect ratio
- 0:
-
absence of oxygen (vacuum conditions)
- ref:
-
reference condition
References
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Christian Klein: He studied physics at the University of Göttingen and joined for his diploma work the Max-Planck Institute for Fluid Mechanics in Göttingen. The diploma work was an experimental investigation of turbulent channel flow using LDV. He received his diploma degree in 1994. For his following Ph.D. thesis, he investigated the application of Pressure Sensitive Paint (PSP) for transonic flows at the German Aerospace Center in Göttingen. He received his doctoral degree in 1997 from the University of Göttingen. Currently, he works as a researcher in the field of PSP applications for low-speed flows.
Rolf H. Engler: In 1969 he received his Dipl. Ing. degree at the Ing.-Academy of Wolfenbüttel in the field of air conditioning. After three years in industry, he started a study at the University of Göttingen and received his Dipl.-Physiker degree in 1979 for vortex investigation using Ultrasonic pulses. In 1986 he received the Dr. rer. nat. degree for experimental investigations of vortex breakdown using a newly developed non intrusive technique — the Ultrasonic-Laser-Method. He was still engaged to develop nondisturbing methods for flow field and surface investigations and temperature measurements. Since 1991 he works on pressuresensitive paint techniques PSP in different wind tunnels of DLR and Europe. Since 1995 he is the project leader of the PSP team at DLR Göttingen and created with his team a DLR-PSP-Intensity system for various speed ranges as well as the PSP-Lifetime technique.
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Klein, C., Engler, R.H. Visualization of aerodynamic effects on a double-delta wing aircraft model using Pressure Sensitive Paint (PSP) technique. J Vis 2, 9–16 (1999). https://doi.org/10.1007/BF03182546
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DOI: https://doi.org/10.1007/BF03182546