Wind Tunnel Experiment:
1. Using the manometer measurements, determine the two speedswith which the wind tunnel was operated. (1 mark)
2. Discuss how changes in Reynolds Number affect the flowseparation and provide a source that supports your suggestion.(2 mark)
3. Discuss how the angle which separated flow is achieved variesfor each tuft depending on its location and explain why this isoccurring.
4. What flow structure can be identified at the tip of the wingand describe how the tufts react differently at this location?
5. Calculate the Static Pressure Coefficient over the wing usingthe static pressure values provided. (1 Mark)
CFD Analysis:
6. Describe your CFD methodology, meshing considerations andsolution setup. Justify the decisions you have made for theseparameters using results that you have obtained or by citingsuitable references.
7. Determine the lift and drag for the wing at both angles ofattack using the CFD model. (1 Mark)
8. Compare the flow fields for both angles of attack, describeand locate the key flow features such as those in the wake regionand separation points if they exist.
9. Calculate the Static Pressure Coefficient over the wing andthe velocity field in the wake from your CFD results and plot theseover the corresponding experimental results provided. (2Mark)
Discussion and Conclusion:
10. Include a detailed discussion comparing your CFD analysisand results with the wind tunnel results plotted in question 9.Identify any sources of error between the experiment and the CFDand determine how this may have affected the comparison between thetwo.
11. If you were asked to repeat the CFD analysis, what would youchange in the setup of the model to better predict the flowfeatures viewed in the wind tunnel.
| Manometer (off) | Manometer (low) | Manometer (high) | | |
| Length (mm) | 255 | 330 | 403 | | |
| Height (mm) | 52.14649322 | 67.48369711 | 82.41190889 | | |
| Gradient (°) | 11.8 | 11.8 | 11.8 | | |
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| Manometer reading at lowspeed: | | |
| Tuft 1(°) | Tuft 2(°) | Tuft 3(°) | Tuft 4(°) | Tuft 5(°) | | |
| 1 | - | 16.8 | 14.1 | 15.1 | 12 | Trailing end | |
| 2 | - | 18.3 | 16.3 | 17.5 | 14.2 | | |
| 3 | - | 21.2 | 19.2 | 20.2 | 24.7 | Leading Edge | |
| 16.3°-Vortex becomesparallel to the wind tunnel | | |
| | | | | | | |
| Manometer reading athigh speed: | | |
| Tuft 1 | Tuft 2 | Tuft 3 | Tuft 4 | Tuft 5 | | |
| 1 | - | 16.6 | 13.7 | 15.2 | 12.1 | Trailing end | |
| 2 | 14.2 | 17.8 | 15.7 | 16.2 | 13.7 | | |
| 3 | - | 22.1 | 16.7 | 19.8 | 22.1 | Leading Edge | |
| 9°-Vortex becomesparallel to the wind tunnel | | |
