Now showing items 1-7 of 7
Powered Resonance Tubes: Resonance Characteristics and Actuation Signal Directivity
The powered resonance tube (PRT) actuator and its variants are new developments in active flow control (AFC) technology. The PRT is attractive because it has no moving parts and can produce acoustic tones that have amplitudes ...
INSTABILITY MODES EXCITED BY NATURAL SCREECH TONES IN A SUPERSONIC RECTANGULAR JET
(AMER INST PHYSICS, 1994-12)
Criteria for the Existence of Helical Instabilities in Subsonic Inpinging Jets
(American Inst Physics, 2007-10)
Understanding instability modes in impinging jets is important for the design of advanced vertical takeoff and landing aircraft. Our initial experimental observations of helical modes in subsonic impinging jets were contrary ...
Jet Impingement Tone Suppression Using Powered Resonance Tubes
(American Inst Aeronaut Astronaut, 2007-05)
This work is an experimental study of high subsonic jet impingement tone suppression. We begin by documenting the characteristics of the impingement tone for various Mach numbers and standoff (nozzle exit to ground plate) ...
Nonlinear Interactions as Precursors to Mode Jumps in Resonant Acoustics
(American Inst Physics, 2005-09)
This paper examines instability mode switching in various supersonic jet configurations that involve resonant acoustics. Resonant acoustics includes situations where flow instabilities are enhanced by feedback. The pressure ...
MODE SPECTRA OF NATURAL DISTURBANCES IN A CIRCULAR JET AND THE EFFECT OF ACOUSTIC FORCING
(SPRINGER VERLAG, 1994-10)
A modal spectrum technique was used to study coherent instability modes (both axisymmetric and azimuthal) triggered by naturally occurring disturbances in a circular jet. This technique was applied to a high Reynolds number ...
Using Controlled Unsteady Fluid Mass Addition to Enhance Jet Mixing
(American Inst Aeronaut Astronaut, 1997-04)
A rectangular jet was excited by controlled unsteady fluid mass addition using two miniature fluidic jets placed on either side of its narrow dimension. The subharmonic of the primary's preferred jet column frequency ...