Micro Synthetic Jets as Effective Actuator

Micro Synthetic Jets as Effective Actuator
Author: Mehti Koklu
Publisher:
Total Pages: 276
Release: 2007
Genre: Jets
ISBN: 9780549069454

Due to lack of experimental studies on micro synthetic jets, validation of the current method is accomplished in two steps. In the first step, capabilities of the methodology are tested successfully by computing flowfields inside a microchannel, microfilter, and micro backward facing step. In the second step, a realistic modeling of a synthetic jet in macro flow conditions is validated with experimental results.

Investigation of Scaling Effects for a Synthetic Jet Actuator Using High and Low Fidelity Analyses

Investigation of Scaling Effects for a Synthetic Jet Actuator Using High and Low Fidelity Analyses
Author: Amandine Bourlier
Publisher:
Total Pages: 134
Release: 2010
Genre: Actuators
ISBN:

"This research presents as investigation on the scaling effects for synthetic jet actuators using Ansys-CFX and a lumped element model (LEM) ... A computational fluid dynamics (CFD) model was created, using Ansys-CFX, to be validated against referred publications ... Finally a test case was conducted with both models, velocity profile was extracted for future use in application of controlled separated flow over an airfoil using an actuator and optimal excitation parameters were obtained. More recently, synthetic jet actuators have also been investigated for applications on micro-air vehicles [MAVs] as micro-jet propulsion. The last application has been specifically targeted in this project. In particular, the optimization of synthetic jet actuators could lead to the design of Micro Air Vehicles (MAV) equipped with an array of synthetic jets for a complete control of the vehicle."--Abstract, P. 4.

Smart Actuation and Sensing Systems

Smart Actuation and Sensing Systems
Author: Giovanni Berselli
Publisher: BoD – Books on Demand
Total Pages: 732
Release: 2012-10-17
Genre: Technology & Engineering
ISBN: 9535107984

The objective of the present book, which tries to summarize in an edited format and in a fairly comprehensive manner, many of the recent technical research accomplishments in the area of Smart Actuators and Smart Sensors, is to combine researchers and scientists from different fields into a single virtual room. The book hence reflects the multicultural nature of the field and will allow the reader to taste and appreciate different points of view, different engineering methods and different tools that must be jointly considered when designing and realizing smart actuation and sensing systems.

A Reduced-Order Model for Efficient Simulation of Synthetic Jet Actuators

A Reduced-Order Model for Efficient Simulation of Synthetic Jet Actuators
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
Total Pages: 32
Release: 2018-08-29
Genre:
ISBN: 9781726159449

A new reduced-order model of multidimensional synthetic jet actuators that combines the accuracy and conservation properties of full numerical simulation methods with the efficiency of simplified zero-order models is proposed. The multidimensional actuator is simulated by solving the time-dependent compressible quasi-1-D Euler equations, while the diaphragm is modeled as a moving boundary. The governing equations are approximated with a fourth-order finite difference scheme on a moving mesh such that one of the mesh boundaries coincides with the diaphragm. The reduced-order model of the actuator has several advantages. In contrast to the 3-D models, this approach provides conservation of mass, momentum, and energy. Furthermore, the new method is computationally much more efficient than the multidimensional Navier-Stokes simulation of the actuator cavity flow, while providing practically the same accuracy in the exterior flowfield. The most distinctive feature of the present model is its ability to predict the resonance characteristics of synthetic jet actuators; this is not practical when using the 3-D models because of the computational cost involved. Numerical results demonstrating the accuracy of the new reduced-order model and its limitations are presented.Yamaleev, Nail K. and Carpenter, Mark H.Langley Research CenterACTIVE CONTROL; JET FLOW; FINITE DIFFERENCE THEORY; NAVIER-STOKES EQUATION; ACTUATORS; CAVITY FLOW; THREE DIMENSIONAL MODELS; COMPUTATIONAL GRIDS; TIME DEPENDENCE...

Advances in Effective Flow Separation Control for Aircraft Drag Reduction

Advances in Effective Flow Separation Control for Aircraft Drag Reduction
Author: Ning Qin
Publisher: Springer Nature
Total Pages: 341
Release: 2019-10-17
Genre: Technology & Engineering
ISBN: 3030296881

This book presents the results of a European-Chinese collaborative research project, Manipulation of Reynolds Stress for Separation Control and Drag Reduction (MARS), including an analysis and discussion of the effects of a number of active flow control devices on the discrete dynamic components of the turbulent shear layers and Reynolds stress. From an application point of view, it provides a positive and necessary step to control individual structures that are larger in scale and lower in frequency compared to the richness of the temporal and spatial scales in turbulent separated flows.

Turbulence Structure and Modulation

Turbulence Structure and Modulation
Author: Alfredo Soldati
Publisher: Springer
Total Pages: 319
Release: 2014-05-04
Genre: Technology & Engineering
ISBN: 370912574X

Controlling turbulence is an important issue for a number of technological applications. Several methods to modulate turbulence are currently being investigated. This book describes various aspects of turbulence structure and modulation, and explains and discusses the most promising techniques in detail.

Synthetic Jets

Synthetic Jets
Author: Kamran Mohseni
Publisher: CRC Press
Total Pages: 378
Release: 2014-09-17
Genre: Science
ISBN: 1439868115

Compiles Information from a Multitude of SourcesSynthetic jets have been used in numerous applications, and are part of an emergent field. Accumulating information from hundreds of journal articles and conference papers, Synthetic Jets: Fundamentals and Applications brings together in one book the fundamentals and applications of fluidic actuators.

Parallel Computational Fluid Dynamics 2006

Parallel Computational Fluid Dynamics 2006
Author: Jang-Hyuk Kwon
Publisher: Elsevier
Total Pages: 320
Release: 2007-09-12
Genre: Computers
ISBN: 0080550045

The proceedings from Parallel CFD 2006 covers all aspects of parallel computings and its applications. Although CFD is one of basic tools for design procedures to produce machineries, such as automobiles, ships, aircrafts, etc., large scale parallel computing has been realized very recently, especially for the manufactures. Various applications in many areas could be experienced including acoustics, weather prediction and ocean modeling, flow control, turbine flow, fluid-structure interaction, optimization, heat transfer, hydrodynamics. - Report on current research in the field in an area which is rapidly changing - Subject is important to all interested in solving large fluid dynamics problems - Interdisciplinary activity. Contributions include scientists with a variety of backgrounds

Flow Control Via Synthetic Jet Actuation

Flow Control Via Synthetic Jet Actuation
Author: Adam Cole Miller
Publisher:
Total Pages:
Release: 2005
Genre:
ISBN:

An experimental investigation was undertaken to determine the ability of Synthetic Jet Actuators to control the aerodynamic properties of a wing. The Synthetic Jet Actuator (SJA) was placed at two separate positions on a wing comprised of a NACA0015 airfoil. The first of the jet positions is located at 12% of the chord, hereby referred to as the leading edge Synthetic Jet Actuator. The second exit position is located at 99% chord of an airfoil and hereby is referred to as the trailing edge Synthetic Jet Actuator. The two locations produced different benefits as the angle of attack of the wing was increased. The leading edge Synthetic Jet Actuator delayed the onset of stall of an airfoil, suppressing stall up to 25 degrees angle of attack. The control of the aerodynamic characteristics was achieved by influencing the amount of the separated flowfield region. The effects of the dynamic stall vortex were investigated with wind tunnel testing during the pitching motion of an airfoil to determine how the flow reacts dynamically. The trailing edge synthetic jet actuator was investigated as a form of low angle "hingeless" control. The study investigated the effect of the jet momentum coefficient on the ability of the synthetic jet to modify the lifting and pitching moment produced from the wind tunnel model. The data indicates that, with the present implementation, the SJA-jet flap generates moderate lift and moment coefficient increments that should be suitable for hinge- less control. It was also shown that, for the current experimental setup and a given jet momentum coefficient, continuous blowing is more effective than oscillatory blowing/sucking. The data shows that combining the SJA with a Gurney flap does not result in performance enhancement.

IUTAM Symposium on Flow Control and MEMS

IUTAM Symposium on Flow Control and MEMS
Author: Jonathan F. Morrison
Publisher: Springer Science & Business Media
Total Pages: 456
Release: 2010-09-09
Genre: Technology & Engineering
ISBN: 1402068581

The Symposium brought together many of the world’s experts in fluid mechanics, microfabrication and control theory to discover the synergy that can lead to real advances and perhaps find ways in which collaborative projects may proceed. The high profile meeting was attended by keynote speakers who are leaders in their fields. A key driver was the improvement in flow efficiency to reduce drag, and thereby emissions arising from transport. About 65 papers were presented.