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Showing 1 to 20 of 47 for “"Synthetic Jet"”.
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Robust Nonlinear Estimation and Control Applications using Synthetic Jet Actuators
… of an aircraft wing. To address this, the use of synthetic jet actuators (SJAs) in UAV flight control systems is becoming popular as a practical alternative and to mechanical deflection surfaces.</p> <p>Synthetic jet actuators are promising tools for LCO suppression systems in small UAVs due to …
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Quantitative Acetone PLIF Measurements of Jet Mixing with Synthetic Jet Actuators
Fuel-air mixing enhancement in axisymmetric jets using an array of synthetic jet actuators around the perimeter of the flows (primarily parallel to the flow axis) was investigated using planar laser-induced fluorescence of acetone. The synthetic jets are a promising new mixing control and …
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Design of Synthetic Jet Actuator for Flight Control of Small UAV
… of this project is to develop a prototype SJA - Synthetic Jet Actuator to embed into a small UAV with modified Glauert wing cross-section for Active Flow Control. Apart from lift enhancement, drag reduction, or separation control, etc; LCO suppression might be possible by modifying the boundary …
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RESONANCE BASED LOW FREQUENCY SYNTHETIC JET ACTUATOR MODELING, DESIGN, AND TESING
Synthetic Jet Actuators have been the topic of extensive study in the aerospace industry because of their ability to actively control flow over aerodynamic surfaces without discrete control surfaces such as a flap. One challenge has been to develop a low frequency, lightweight actuator that can …
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Experimental Investigation of Active Wingtip Vortex Control Using Synthetic Jet Actuators
… wind tunnel to quantify the effect of spanwise synthetic jet actuation (SJA) on the drag of a NACA 0015 semispan wing. The wing, which was designed and manufactured for this experiment, has an aspect ratio of 4.20, a span of 0.427 m (16.813”), and is built around an internal array of …
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Numerical Study of Synthetic-Jet Actuation Effect on Airfoil Trailing Edge Noise
… to assess the possibility of employing Synthetic Jet Actuators (SJAs) as active noise control devices for reduction of airfoil acoustic radiation. High-accuracy numerical efforts employ a sixth-order accurate Navier-Strokes solver implementing a low-pass filtering of poorly resolved …
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Adaptive and Neural Network-Based Aircraft Tracking Control with Synthetic Jet Actuators
<p>Wing-embedded synthetic jet actuators (SJA) can be used to achieve maneuvering control in aircraft by delivering controllable airflow perturbations near the wing surface. Trajectory tracking control design for aircraft equipped with SJA is particularly challenging, since the controlling actuator …
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The design of a combustion test facility for synthetic jet fuel research
… was appropriate to review the complete list of jet-fuel specifications to assess whether they were sufficiently robust to ensure fit-forpurpose within the new paradigm. Although this has been an industry-wide endeavour, there were some particular research areas that were identified for special …
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An Experimental Study of Synthetic Jet Actuators with Application in Airfoil LCO Control
… study on the development and implementation of Synthetic Jet Actuators (SJAs) is conducted for eliminating aeroelastic phenomenon such as Limit Cycle Oscillations (LCO). One of the biggest challenges involved in the design of UAVs operating in unsteady atmosphere conditions is the susceptibility …
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The effect of synthetic jet driving parameters on heat transfer in microchips cooling channels
… forced convection in the microchannel and the synthetic jet impingements. A parametric study has been carried out on the operating conditions on the synthetic jet actuator, these parameters including: the frequency of the diaphragm in the actuator, the jet outlet velocity both in magnitude and …
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Ducted Fan Aerodynamics and Modeling, with Applications of Steady and Synthetic Jet Flow Control
… active flow control. Steady and piezoelectric synthetic jet blowing are employed in the flow control concepts and are compared. The new aerodynamic model captures the nonlinear characteristics of the force, moment, and power data for a ducted fan, while representing these terms in a set of …
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Robust and Adaptive Nonlinear Control of Limit Cycle Oscillations in UAVs Using Synthetic Jet Actuators
… (e.g., ailerons). To address this, the use of synthetic jet actuators (SJAs) in UAV fight control systems is becoming popular as a practical alternative to mechanical deflection surfaces. SJAs are promising tools for LCO suppression systems in small UAVs due to their small size, ease of …
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Investigation of Scaling Effects for a Synthetic Jet Actuator Using High and Low Fidelity Analyses
… an investigation on the scaling effects for synthetic jet actuators using Ansys-CFX and a Lumped Element Model (LEM). Synthetic jets or zero net mass-flux devices use a vibrating diaphragm to generate an oscillatory flow through a small orifice. A synthetic jet actuator can be used on MAVs as …
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Improvement In Acoustic Liner Attenuation In Turbofan Engines By Means Of Plasma Synthetic Jet Actuator
Despite many advances in aviation noise control over the past 50 years, the industry is continually striving to reduce noise emissions. Turbofan engine acoustic liners are efficient attenuators of engine noise. Plasma actuators have been used as flow control devices in other settings and will now …
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Jet oscillation applied for aircraft cabin ventilation using active flow control actuators
… This study explores the effectiveness of jet oscillation using active flow control to improve air delivery inside a cabin. The pulsed jet and synthetic jet are selected among the various control techniques to provide the control excitations on the air supply condition based on a detailed …
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A novel method to evaluate synthetic fuel options for gas turbines in terms of O-ring swelling
… put significant strain on the availability of jet fuel at Oliver Tambo International Airport (ORTIA). In 2008, Sasol was granted an approval to use fully synthetic jet fuel upon the publication of Defence Standard 91-91, Issue 6 [1]. Sasol's fully synthetic jet fuel is the only fuel in the …
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Experimental Design and Analysis of Piezoelectric Synthetic Jets in Quiescent Air
… each year by making an aircraft more efficient. Synthetic jets, a device for active flow control, operate by introducing small amounts of energy locally to achieve non-local changes in the flow field with large performance gains. These devices consist of a cavity with an oscillating diaphragm …
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Active Flow Control of a Three-Element Airfoil in Unbounded Flow and in Ground Effect
… Active Flow Control (AFC) by injecting a uniform jet or by including a synthetic jet near the leading edge of the flap to change the momentum in the boundary layer on the flap. The goal is to enhance lift by reducing separation on the flap at higher flap angles. The results show that in unbounded …
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