1. Da’ Fuser Team Turbojet Diffuser Study Progress Report 4 Robby Swoish Mike Vostrizansky Ryan Wiltshire November 17, 2005

2. Progress Completed baseline separation tests Completed baseline separation tests China ClayChina Clay String VisualizationString Visualization Cut tapped diffuser model into two pieces so that the interior of the model may be accessed Cut tapped diffuser model into two pieces so that the interior of the model may be accessed Calculated diffuser efficiencies from tests 5 and 6 Calculated diffuser efficiencies from tests 5 and 6

3. Experimental Setup

4. Tests 7 Goal: Characterize separation point on diffuser model using China Clay Goal: Characterize separation point on diffuser model using China Clay Results: Found separation point to occur ~1.5 cm downstream of the inlet Results: Found separation point to occur ~1.5 cm downstream of the inlet

5. Test 7 Trial 1 Trial 2Trial 3 Flow Separation Point

6. Test 7 Video Video

7. Test 8 Goal: Confirm separation point using bright colored string visualization techniques. Goal: Confirm separation point using bright colored string visualization techniques. Results: Separation occurred at a distance consistent with the China Clay tests. Results: Separation occurred at a distance consistent with the China Clay tests.

8. Test 5 and 6 Analysis Diffuser Efficiencies Diffuser Efficiencies TestWall Eff. At Mach 0.33 Eff. At Mach 0.38 5Top0.3790.375 5Bottom0.2250.170 6Top0.4180.374 6Bottom0.1450.126

9. Future Work Modify model and test Modify model and test Reiterate modification and testing scheme Reiterate modification and testing scheme

10. Investigation Schedule Progress (weeks)

11. Potential Modifications Boundary Layer Control By: Boundary Layer Control By: –Suction –Blowing –Vanes –Flow Control Rails –High Inlet Turbulence –Other Vortex Generators