Boundary layer separation control with directed synthetic jets

McCormick, D. C.

doi:10.2514/6.2000-519

Cited by 143 publications

(74 citation statements)

References 7 publications

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“…McCormick [13] and Gallas et al [14] present lumped parameter models for a synthetic jet actuator with loudspeaker and piezoelectric actuator respectively, in order to predict the jet velocity from the excitation voltage.…”

mentioning

confidence: 99%

General Reduced-Order Model to Design and Operate Synthetic Jet Actuators

Persoons

2012

AIAA Journal

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confidence: 99%

General Reduced-Order Model to Design and Operate Synthetic Jet Actuators

Persoons

2012

AIAA Journal

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“…Actuation is provided by the movement of the titanium diaphragm of a Selenium D3300Ti compression driver whose voltage signal is amplified by a Crown D-150A amplifier. This device is conceptually similar to the unsteady bleed actuator used by Williams et al 4,6 and Ziada et al 24 for a similar purpose and by McCormick 33 for boundary layer-separation control. The compression-driver diaphragm is capable of oscillating in the frequency range 1-20 kHz.…”

Section: Flow Facilitymentioning

confidence: 99%

Logic-Based Active Control of Subsonic Cavity Flow Resonance

Debiasi

Samimy

2004

AIAA Journal

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We present the results of an experimental investigation for controlling a shallow cavity flow in the Mach number range 0.25-0.5. The flow exhibits the characteristic staging behavior predicted by the semi-empirical Rossiter formula with multiple modes in the Mach number range 0.32-0.38 and a single strong mode in other Mach numbers. A survey of the velocity at the exit of the zero net mass flow compression-driver actuator used for control reveals that its amplitude is frequency dependent and its behavior is little influenced by the main flow. Forcing the Mach 0.3 flow indicated that the actuator has good authority over a large range of frequencies, with reduction of spectral peaks observed at some forcing frequencies. We took advantage of this phenomenon to develop a logicbased controller that searches the frequency space and maintains the optimal forcing frequency for peak reduction at each Mach number. Optimal frequencies and the corresponding reduced resonance have been obtained for all of the flow conditions explored. The physics of optimal frequency forcing as well as some characteristics of the logic-based controller are discussed.

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“…The research status in this field also indicates that the vane-type VG shapes are superior in performance when compared to the ramp/wedge-type VGs and, therefore, more innovative designs need to be looked into to match the effectiveness of the former. Although nothing concrete could be ascertained about control location, a rough estimate indicates that this distance is to be somewhere between (15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) x/ h (where x is the distance of the control location from the interaction).…”

Section: Thematic Issue On Supersonic Flow Controlmentioning

confidence: 99%

“…Vadillo et al [18] also confirmed that synthetic jet actuators are promising devices to control the strength of shock waves and their unsteadiness as well as the shock-induced separation due to SWBLI, and, therefore, are a good candidate for achieving "hingeless" control to reduce drag. On the other hand, McCormick [19,20] developed a new concept, the so-called "directed synthetic jet", whereby energy is transferred to the boundary layer in the direction tangential to the body surface. The effectiveness of the concept was however shown only for leading-edge separation at a very low Mach number.…”

Section: Introductionmentioning

confidence: 99%