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Showing 1 to 6 of 6 for “"jet control"”.
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Reaction Control Jet Actuators for Air-Breathing Hypersonic Vehicles
… vehicles tend to be unstable and high frequency control is required to maintain steady flight. To provide high frequency control, aerodynamic control surfaces may need to be supplemented or replaced by high frequency actuators. Reaction control (RC) jets are an attractive solution, as they are …
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Chaos Control of an Open Shear Flow: A Novel Control Strategy and its Experimental Demonstration in an Axisymmetric Jet
A nonlinear dynamical systems approach to control the coherent structure dynamics and turbulence in the near field of an axisymmetric jet is presented. Experiments were performed in an initially laminar circular jet, housed in a low-noise anechoic chamber. Periodic flow states involving various …
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Active Flow Control of a Three-Element Airfoil in Unbounded Flow and in Ground Effect
… flow field is then subjected to 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 …
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Methodologies for active control of free shear flows
… is to study the basic mechanism of the active control of free shear flows and look for new concepts in actuation methodologies. The possibility of controlling the evolution of a triangular jet is discussed in Chapter 2. The piezoceramic actuators were mounted on the flat sides of the nozzle. …
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Jet Fluid Mixing Control Through Manipulation Jet Fluid Mixing Control Through Manipulation of Inviscid Flow Structures
… many industrial and propulsion devices involving jet flows. In this dissertation, two methodologies, self-excited nozzles and radially lobed nozzles, are studied and presented in order to enhance mixing in the near field of coflowing, subsonic, turbulent, free jet flows. The characteristics of the …
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The Effects of Active Flow Control on High-Speed Jet Flow Physics and Noise
… generation of a fully turbulent, compressible jet flow within a large scale anechoic chamber. The investigations are aimed at understanding the complex nature of the jet flow field in an effort to reduce the far-field noise through active flow control and novel reduced-order modeling. The flow …