Weekly_4-10 - Weekly Progress Report #8 Background Oriented...

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Weekly Progress Report #8 Background Oriented Schlieren AAE 490R/590R 10 April 2008 Hrs. Worked Landon Baur John Tapee 1
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Progress in Brief – 4/9/08 Week’s Goals 1) Sandblast scrap aluminum to create a background with very fine (and quite random) dots. 2) Image flow in Mach 2 wind tunnel at ASL for qualitative and quantitative aspect. Hopefully, a shock pattern in the wind tunnel will be large enough and strong enough to be easily visualized, and it should provide a baseline upon which we can build the quantitative analysis. 3) Continue refining PIV procedure a. Study Ebenezer’s code to understand all inputs. b. Evaluate Ebenezer’s image pre-processor in conjunction with mpiv. Week’s Accomplishments 1) We sandblasted both an aluminum sheet and a steel plate to procure a random dot pattern with very fine features. Pictures were taken of each of these backgrounds with the shop nozzle included for scale, and while these backgrounds definitely provide more spatial resolution, there is quite a bit less contrast in the image. Further testing will provide an answer for the question of contrast. 2) The Mach 2 tunnel was run using both lined (qualitative) and dotted (quantitative) backgrounds. Unfortunately, the lined backgrounds did not show a distinct shock wave as we had hoped, and the dotted background images did not seem to produce the correct result when analyzed with the PIV software. 3) After further review, we have decided to use Ebenezer’s PIV code. While we do not completely understand the differences between his code and others we have tested, his code seems to give the best results. Since the PIV algorithm itself is not the focus of this project, these better results are sufficient reason to use Ebenezer’s code. Next Week’s Plan 1) Return to Mach 2 tunnel with prepared PIV procedure and test using backgrounds at different distances (thus changing the sensitivity of the system). Also, use the double wedge model to reduce boundary layer effects. 2) Test the shop nozzle against both aluminum and steel backgrounds. 3) Figure out how to solve for the density field given the density gradient field. Progress in Detail – 4/9/08 Sandblasted Backgrounds Aluminum and stainless steel sheet scraps were obtained at the ASL and were sandblasted. This produced fine dotted backgrounds with a higher density of dots than the MATLAB script, but the dot sizes remained small. The aluminum sheet proved to be more useful to our project than the steel, as it did not reflect the dots well enough for the camera to pick up clearly. Pictures were taken with the closest distances using 75mm in focus and 350mm in focus. Below are images of the sandblasted aluminum and steel sheets with the shop nozzle in view for 2
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comparison. No airflow was used. These images were only taken to test the sensitivity of the camera with these backgrounds. Figure 1 – Pictures of sandblasted background with shop
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This note was uploaded on 01/15/2012 for the course AAE 490 taught by Professor Andrisani during the Fall '09 term at Purdue University-West Lafayette.

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Weekly_4-10 - Weekly Progress Report #8 Background Oriented...

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