Da’ Fuser TeamTurbojet Diffuser Study

Data Presentation

Robby SwoishRobby SwoishMike VostrizanskyMike VostrizanskyRyan WiltshireRyan WiltshireNovember 29, 2005November 29, 2005

Tests To DateTests To Date

• Mach Number CharacterizationMach Number Characterization• BaselineBaseline

• 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 ClayChina Clay• String VisualizationString Visualization

• Surface Roughness ModificationsSurface Roughness Modifications• Pressure Tests (Mach .33 and .38)Pressure Tests (Mach .33 and .38)

• 120 grit sand paper120 grit sand paper• 80 grit sand paper80 grit sand paper• 60 grit sand paper60 grit sand paper

• Chevron Vortex GeneratorsChevron Vortex Generators• Pressure Tests (Mach .33 and .38)Pressure Tests (Mach .33 and .38)

Experimental SetupExperimental Setup

Mach Number Mach Number CharacterizationCharacterization

D = 44 mm

Mach 0.33

D = 48 mm

Mach 0.38

0

0.1

0.2

0.3

0.4

0.5

0.6

35 40 45 50 55

Diameter (mm)

Ma

ch

Nu

mb

er

Baseline TestsBaseline Tests

Pressure TestsPressure Tests

Mach .33 Bottom Side Pressures

92000922009240092600928009300093200934009360093800

0 1 2 3 4 5 6

Pressure Tap

Pre

ssure

Mach .38 Top Side Pressures

8750088000885008900089500900009050091000915009200092500

0 1 2 3 4 5 6

Pressure Tap

Pre

ssure

Mach .38 Top Side Pressures

90200904009060090800910009120091400916009180092000

0 1 2 3 4 5 6

Pressure Tap

Pre

ssure

Mach .33 Top Side Pressures

90500

91000

91500

92000

92500

93000

93500

94000

0 1 2 3 4 5 6

Pressure tap

Pre

ssure

Baseline TestsBaseline Tests

Pressure TestsPressure Tests

TestTest WallWall Eff. At Eff. At Mach Mach 0.330.33

Eff. At Eff. At Mach Mach 0.380.38

55 TopTop 0.3790.379 0.3750.375

55 BottomBottom 0.2250.225 0.1700.170

66 TopTop 0.4180.418 0.3740.374

66 BottomBottom 0.1450.145 0.1260.126

Baseline TestsBaseline Tests

Separation TestsSeparation Tests– China ClayChina Clay

Trial 1

Flow Separation Point

Trial 2 Trial 3

Baseline TestsBaseline Tests

Separation TestsSeparation Tests– China ClayChina Clay

Found separation to occur ~ 1.5 cm Found separation to occur ~ 1.5 cm downstream of inletdownstream of inlet

– String VisualizationString Visualization Results were consistent with China Clay Results were consistent with China Clay

teststests

Surface Roughness Surface Roughness ModificationsModifications Pressure TestsPressure Tests

– 120 grit sand paper120 grit sand paper

– 80 grit sand paper80 grit sand paper

- 60 grit sand paper- 60 grit sand paper

Chevron Vortex Chevron Vortex GeneratorsGenerators Pressure TestsPressure Tests

Chevrons

Testing Testing Results/Preliminary Results/Preliminary ConclusionsConclusions

Coefficient of Pressure for Various Modifications at Mach .33 (Bottom Side)

0

0.05

0.1

0.15

0.2

0.25

0.3

1

Co

effi

cien

t o

f P

ress

ure

(C

p)

Baseline

120 Grit

80 Grit

60 Grit

Chevrons

Coefficient of Pressure for Various Modifications at Mach .33 (Top Side)

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

1

Co

effi

cien

t o

f P

ress

ure

(C

p)

Baseline

120 Grit

80 Grit

60 Grit

Chevrons

- Surface Roughness decreased Surface Roughness decreased Coefficient of Pressure For All Coefficient of Pressure For All ConditionsConditions

- Chevrons (Vortex Generator) Chevrons (Vortex Generator) Increased Cp In All ConditionsIncreased Cp In All Conditions

Note: Cp is An Indicator of Efficiency Cp = (Pout –Pin)/(Poin-Pin)

inin

inout

PPo

PPCp

inin

inout

PPo

PPCp

inin

inout

PPo

PPCp

inin

inout

PPo

PPCp

Diffuser ReshapingDiffuser Reshaping

Refine diffuser divergence angle Refine diffuser divergence angle via modeling clay techniquesvia modeling clay techniques

Pressure tests to be completed by Pressure tests to be completed by Wednesday, 11/30/2005.Wednesday, 11/30/2005.

Investigation Schedule Progress (weeks)Investigation Schedule Progress (weeks)