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Showing 1 to 14 of 14 for “"flow control techniques"”.
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Exploring Passive Flow Control Techniques Applied to a Supersonic Multistream Rectangular Nozzle
<p>Passive control techniques are applied experimentally to examine different aspects of a supersonic multistream rectangular nozzle representing a modern airframe-integrated variable cycle engine. The flow is comprised of a core stream (M = 1.6) and bypass (M = 1.0) that merge behind a splitter …
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Experimental Investigation of Flow Control Techniques To Reduce Hydroacoustic Rotor-Stator Interaction Noise
Control of radiated acoustic noise is vital to the survivability and the detectability of submersible watercraft. Two primary sources of radiated fluid noise in submersible vessels are the boundary layer turbulence along the forebody and propulsor fluid-structure interaction. The propulsor contains …
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Flow control techniques in a serpentine inlet : an enabling technology to increase the military viability of unmanned air vehicles
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics; and, (S.M.)--Massachusetts Institute of Technology, Engineering Systems Division, Technology and Policy Program, 2003.
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Flow analysis and control in a subsonic inlet
… with the risk of compressor instabilities. Flow control is considered as a promising way to maintain inlet efficiency in off-design flight conditions. Industrial interest for flow control techniques is therefore rising, and a need for their comparative evaluation has been expressed. In …
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Aerodynamic drag reduction of a racing motorcycle through vortex generation
… redesign of the surfaces or through some type of flow control mechanism. Due to limitations on the size of the exterior shape the flow control techniques are more practical. Small metal vanes, known as vortex generators were used in this research to mix higher energy freestream air with the lower …
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Simulation of a power station's condensate pumping system in view of improving its efficiency
… Pumps (CEPs) installed in power stations, the flow control is implemented by conventional valve throttling of the discharge valve of these pumps. This type of flow control is uneconomical, as more than 30 of the flow – and the pressure – that can be supplied by the CEPs, is throttled under …
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Active and Passive Flow Control over the Flight Deck of Small Naval Vessels
… pilot workload. Because of the unsteady flow field and large mean velocity gradients, the envelope for flight operations is limited. This experimental investigation uses a 1:144 scale model of the U.S. Navy destroyer DDG-81 to explore the problem. Both active and passive flow control …
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Modeling and Simulation of Parallel D-STATCOMs with Full-Wave Rectifiers
… the nation’s electrical grid. Conventional power flow control techniques such as capacitor banks and tap-changing transformers are incapable of adequately handling the rapid fluctuations in power supply and demand that today’s grid experiences. Flexible AC Transmission System (FACTS) controllers …
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Programming of wicking behavior of hydrogel and paper-based microfluidic device
… (μPADs) have been a popular choice as lateral flow tests (LFTs) platform for diagnostic purpose because of its ease of use, speed, affordability, and spontaneous fluid transport based on an intrinsic property of material. Recent developments have rapidly increased the analytical capacity and …
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The aerodynamics of multi-element wings in ground effect
… both experimental and computational techniques. The primary application of this research is within the field of motorsport. However the results also have applications within the field of aeronautics and offer insights into the flow physics of fundamental aerodynamic features. The …
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Nonlinear Estimation and Control Methods for Mechanical and Aerospace Systems under Actuator Uncertainty
<p>Air flow velocity field control is of crucial importance in aerospace applications to prevent the potentially destabilizing effects of phenomena such as cavity ow oscillations, flow separation, flow-induced limit cycle oscillations (LCO) (flutter), vorticity, and acoustic instabilities. Flow …
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Ducted Fan Aerodynamics and Modeling, with Applications of Steady and Synthetic Jet Flow Control
… vehicle flight and therefore require complex control algorithms. In particular, they exhibit a large nose-up pitching moment during wind gusts and when transitioning from hover to forward flight. Understanding ducted fan aerodynamic behavior and how it can be altered through flow control …
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Lagrangian Visualization and Real-Time Identification of the Vortex Shedding Time in the Wake of a Circular Cylinder
<p>The flow around a circular cylinder, a canonical bluff body, has been extensively studied in the literature to determine the mechanisms that cause the formation of vortices in the cylinder wake. Understanding of these mechanisms has led to myriad attempts to control the vortices either to …
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Development of a multi-port DC-DC converter for a magnetically-coupled residential micro-grid
… converters capable of bidirectional power flow and intelligent algorithms for power converter and micro-grid controls. A topology of multi-port converter using a high frequency magnetic link is proposed for residential micro-grid applications. Using the magnetic link in the proposed …