Da’ Fuser Team Turbojet Diffuser Study Data Presentation Robby Swoish Mike Vostrizansky Ryan Wiltshire November 29, 2005.

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Da’ Fuser Team Turbojet Diffuser Study Data Presentation Robby Swoish Mike Vostrizansky Ryan Wiltshire November 29, 2005

Tests To Date Mach Number Characterization Mach Number Characterization Baseline Baseline Pressure Tests (Mach.33 and.38)Pressure Tests (Mach.33 and.38) Separation Tests (Mach.33 and.38)Separation Tests (Mach.33 and.38) China Clay China Clay String Visualization String Visualization Surface Roughness Modifications Surface Roughness Modifications Pressure Tests (Mach.33 and.38)Pressure Tests (Mach.33 and.38) 120 grit sand paper 120 grit sand paper 80 grit sand paper 80 grit sand paper 60 grit sand paper 60 grit sand paper Chevron Vortex Generators Chevron Vortex Generators Pressure Tests (Mach.33 and.38)Pressure Tests (Mach.33 and.38)

Experimental Setup

Mach Number Characterization D = 44 mm Mach 0.33 D = 48 mm Mach 0.38

Baseline Tests Pressure Tests Pressure Tests

Baseline Tests Pressure Tests Pressure Tests TestWall Eff. At Mach 0.33 Eff. At Mach Top Bottom Top Bottom

Baseline Tests Separation Tests Separation Tests –China Clay Trial 1 Flow Separation Point Trial 2Trial 3

Baseline Tests Separation Tests Separation Tests –China Clay Found separation to occur ~ 1.5 cm downstream of inlet Found separation to occur ~ 1.5 cm downstream of inlet –String Visualization Results were consistent with China Clay tests Results were consistent with China Clay tests

Surface Roughness Modifications Pressure Tests Pressure Tests –120 grit sand paper –80 grit sand paper - 60 grit sand paper

Chevron Vortex Generators Pressure Tests Pressure Tests Chevrons

Testing Results/Preliminary Conclusions - Surface Roughness decreased Coefficient of Pressure For All Conditions - Chevrons (Vortex Generator) Increased Cp In All Conditions Note: Cp is An Indicator of Efficiency Cp = (Pout –Pin)/(P o in-Pin)

Diffuser Reshaping Refine diffuser divergence angle via modeling clay techniques Refine diffuser divergence angle via modeling clay techniques Pressure tests to be completed by Wednesday, 11/30/2005. Pressure tests to be completed by Wednesday, 11/30/2005.

Investigation Schedule Progress (weeks)

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