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Nozzle

Ground plate

Lift plate

Micro Jets

Experimental Set-up

Microphone

10 D

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A

B

C

D

A

B

B

B

A

A

C

C

C

D

D

D

A

C

B

From

Solenoid

Valve

From

Solenoid

Valve

From

Solenoid

Valve

Details of Micro Jet Connection

D

A,B,C,D – Microjet distribution

plenum chamber

Micro Jet dia – 0.4mm

Maximum operating pressure – 110psi

Mass flow ratio - 0.05%

Operating gas – Air

Micro jet inclination angle – 230

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Flow Visualization with Shadowgraph

Without Control

With Control

NPR=3.7 – Free Jet

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Flow Visualization with Shadowgraph

Without Control

With Control

NPR=3.7 – h/D=2

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Flow Visualization with Shadowgraph

Without Control

With Control

NPR=3.7 – h/D=3

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Flow Visualization with Shadowgraph

Without Control

With Control

NPR=3.7 – h/D=3.5

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Flow Visualization with Shadowgraph

Without Control

With Control

NPR=3.7 – h/D=4

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Flow Visualization with Shadowgraph

Without Control

With Control

NPR=3.7 – h/D=4.5

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Flow Visualization with Shadowgraph

Without Control

With Control

NPR=3.7 – h/D=5

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Flow Visualization with Shadowgraph

Without Control

With Control

NPR=3.7 – h/D=6

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Flow Visualization with Shadowgraph

Without Control

With Control

NPR=3.7 – h/D=9

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Near-field Noise Spectra

h/D=2

h/D=3

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h/D=4

h/D=3.5

Near-field Noise Spectra

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h/D=4.5

h/D=6

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Free Jet

h/D=9

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Noise Spectra of Micro Jets

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Pressure Distribution on the

Lift Plate

h/D=3

h/D=2

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h/D=4

h/D=3.5

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h/D=6

h/D=4.5

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Free Jet

h/D=9

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Over All Sound Pressure Level

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Lift loss variation with h/D

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Lift-loss recovered

at various h/D with active control

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