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

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

Experimental Setup

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

Test 7 Trial 1 Trial 2Trial 3 Flow Separation Point

Test 7 Video Video

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.

Test 5 and 6 Analysis Diffuser Efficiencies Diffuser Efficiencies TestWall Eff. At Mach 0.33 Eff. At Mach Top Bottom Top Bottom

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

Investigation Schedule Progress (weeks)

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