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Showing 1 to 13 of 13 for “"Synthetic jets"”.
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Flow Separation Control Using Synthetic Jets on a Flat Plate
… goal of this thesis is to assess the effect of synthetic jets on flow separation. CFD simulation is conducted for laminar flow over a flat plate using the commercial software ANSYS FLUENT. The oscillating zero mass jet flow is simulated by imposing a harmonically varying boundary condition on …
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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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Numerical Modeling of Anti-Icing Using an Array of Heated Synthetic Jets
… control using an array of thermally activated synthetic jet actuators (SJAs) embedded in a wedge surface subject to a super-cooled flow is investigated numerically. The effects of SJA actuation with and without jet heating on ice accretion are studied using the FENSAP-ICE software. It is shown …
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Numerical Modeling of Synthetic Jets in Quiescent Air with Moving Boundary Conditions
… are many potential benefits for implementing synthetic jets to achieve aircraft designs with less moving parts, uper- maneuverability, and separation control for fuel economy. Piezoelectric synthetic jets are of special interest because of their lightweight and low power consumption. Numerous …
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Experimental and Numerical Analysis of Enhanced Micro-Channel Cooling Using Micro-Synthetic Jets
… combines the micro-channel heat sink with micro-synthetic jets. The basic idea is to utilize the flow control aspects of synthetic jets to modify the flow field in micro-channels for better heat transfer performance.</p> <p>Hydrodynamic and thermal characteristics of both single-phase and …
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The Influence of the Slot Aspect Ratio on the Flow Field of Synthetic Jets
… are cheap and lightweight at the same time. The synthetic jet actuator is one such device that has advantages of low cost but also simple structure and easy installation amongst other things, for which it has attracted much research interest. The jet is synthesised from the ambient air, which is …
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Active Flow Control of Subsonic Flow in an Adverse Pressure Gradient Using Synthetic Jets and Passive Micro Flow Control Devices
… with active flow control devices such as synthetic jets to achieve higher control authority.</p><p>The goal of this dissertation is twofold. The first objective is to assess the ability of CFD with URANS turbulence models to accurately capture the effects of the synthetic jets 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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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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QUANTITATIVE VISUALIZATION OF CARBON DIOXIDE GAS TRANSFER AT A TURBULENT FREE SURFACE
… the free surface by an array of upward-pointing synthetic jets which are each driven according to independent random time series. We show that this method of turbulence generation is superior to the traditional grid-stirred tank in that it exhibits weaker mean secondary flows. Using Laser Induced …
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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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Analysis, Simulation and Control of Peak Pressure Loads on Low-Rise Structures
… control strategies include blowing, suction, and synthetic jets. We implement them by using different flux injections, different slot locations and different angles. Investigation of the possible peak pressure reduction for two Reynolds numbers is performed. For Re = 1000, a reduction by nearly …
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Modeling, design, and fabrication of pulsed fluidic micro-actuators
The forced vibration of a thin flexible plate or membrane in a sealed cavity with a small opening can cause fluid to be pumped into and out-of the cavity. At particular frequencies and amplitudes of vibration, a streaming of vortex rings can occur near the orifice. These vortex rings move under …