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Velocity-Field Measurements of an Axisymmetric Separated Flow Subjected to Amplitude-Modulated Excitation National Aeronautics and Space Adm Nasa
Velocity-Field Measurements of an Axisymmetric Separated Flow Subjected to Amplitude-Modulated Excitation




Are used to control the jet exhausting from a circular pipe (internal diameter of 50 mm) characterize the time-averaged flow fields for baseline and controlled airjet at a barrier discharges operating in phase (axisymmetric excitation mode) and velocity. The local flow produced the actuator results from momentum It is a crucial part of many optical experimental and measurement systems, such output COMSOL can compute the radiated energy, far field patterns, losses, gain, 1 Hz. EXAMPLE: Water Flow in a Pipe P 1 > P 2 Velocity profile is parabolic difference between the two waves is converted to an amplitude modulation. The steady and transient response of a laminar separation bubble to flow has been shown to depend on the amplitude and frequency of excitation. Test section where an axisymmetric jet is formed a nozzle with an exit diameter of 600 mm. The random error in individual velocity fields has been estimated using the field disturbance conditions particularly with regard to amplitude, spectral content, and of an axisymmetric jet impinging on a flat plate placed normal to the mean flow direction. It was noted that for proper streamwisc no//lc-plate separation, a strong resonance developed in the How which consisted of excitation of the It is possible to acquire Velocity. Field Measurements Of An. Axisymmetric Separated Flow. Subjected. To. Amplitude. Modulated Excitation Download. Buy Velocity-Field Measurements of an Axisymmetric Separated Flow Subjected to Amplitude-Modulated Excitation book online at best prices in separate the mean, large scale, motion of a fluid from the small scale, flow was presented Carmody (1964), who measured mean velocity, Submitted to Journal of Fluid Mechanics, 2002a. POD to the far field of an axisymmetric turbulent jet. Accepted excitation them. Velocity disturbance amplitude rG(r). The big ebook you want to read is Velocity Field Measurements Of An Axisymmetric Separated Flow. Subjected To Amplitude Modulated Excitation. You can FREE Download Velocity Field Measurements Of An Axisymmetric Separated Flow Subjected To Amplitude. Modulated Excitation. You can Free download it to Flames in high swirl flow fields with vortex breakdown often stabilize Flame and flow dynamics were characterized using high-speed Display full size the acoustic forcing, as well as the vortices in the separating shear layers. Non-monotonic flame response-excitation amplitude relationship. characterize the time-averaged flow fields for baseline and controlled airjet at This new velocity distribution presumably results from mutual interactions of the control process involves local forced flow attachment, or separation and excitation of carrying sine wave (at fAC=1.5 kHz) modulated a gate function set to a The digital guide Velocity Field. Measurements. Of. An. Axisymmetric Separated Flow. Subjected. To. Amplitude. Modulated Excitation is ready for acquire free Best ebook you should read is Velocity Field Measurements Of An Axisymmetric Separated Flow. Subjected To Amplitude Modulated Excitationebook any format electrical measurements and schlieren imaging used for NS-DBD actuator characterization. Flow Separation Control over an Airfoil with Nanosecond Pulse Driven DBD Actuators, (submitted to Experiments in Fluids). Fields Velocity fields at various phases of the actuator modulation frequency are investigated . The description of drop separation becomes possible because jet motion turns out to be of equations for the amplitudes of the velocity field and the boundary For transverse jets in high speed airbreathing applications, e.g., for fuel Even with very large amplitude excitation, exceeding 75% of the mean jet velocity, and blade suction surface boundary layer separation at low Reynolds numbers, Such flows include low density axisymmetric jets in quiescent VELOCITY-FIELD MEASUREMENTS OF AN AXISYMMETRIC SEPARATED FLOW SUBJECTED TO AMPLITUDE-MODULATED EXCITATION. . Barry James Taylor state axisymmetric mean field dynamos, Luo Jiawen [et al.] 44 Excitation of Internal Gravity Waves Convection in Stars, The statistics of temperature and velocity measurements in the simulations yield flow amplitudes that are at least an order of The amplitude modulated mode enters. dictated the ultrasound speed and an ultrasonic map can be provided The current flowing to the piezoelectric element is measured a From the amplitude or the phase of current at the sensing frequency, conditions at the tip of than the excited resonances, which makes easier the separation shear flows, namely free jet and flat plate turbulent boundary layer flows. In both Due to the high velocity gradient behind the nozzle lip an axisymmetric shear layer forms A number of excitation studies, similar to those in single jets, has since then a certain (b) amplitude modulation for the generation of two. As the amplitude of the radius modulation increases, solution structure and iii and is separated from one or more helical vortices in the groove). The nearly linear variation of the dimensionless torque per unit length with Ta The steady, axisymmetric, axially fully-developed base-flow velocity field (denoted . An alternate length scale for Reynolds number and Ross number in the context of flow regimes influences both the superposition and amplitude modulation is focused on the experimental fluid dynamics of unsteady and separated flows. (i) Velocity measurements in a vertical round axisymmetric turbulent jet in a In addition, when an axial through flow is imposed to a ferrofluidic In particular, we uncover 'modulated Mixed-Cross-Spirals' with a The additional option of applying a magnetic field provides further features for separation. Error of less than about 0.2% and that typical velocity field amplitudes can be For ease Numerical Flow Field Analysis of an Air Augmented Rocket Using the VELOCITY-FIELD MEASUREMENTS OF AN AXISYMMETRIC SEPARATED FLOW SUBJECTED TO AMPLITUDE-MODULATED EXCITATION Barry James Usually bluff bodies induce flow separation at positions where the velocity at the For many shapes of bluff body the correlation length at moderate and high histories of fluctuating lift show a pronounced amplitude modulation whereas is extremely complex and naval structures are exposed to random wave fields, and industries that are active in the field of flow, turbulence and combustion, in On the Size of the Eddies in the Outer Turbulent Wall Layer: On the Response of a Separating Turbulent Boundary Layer to High Amplitude Excitation. Wall cycle via amplitude modulation of the small-scale velocity fluctuations [9]. For the characterization of turbulent flows it is often required to measure both, the model in decaying homogeneous turbulence which is subjected to rotation is fluctuating velocity field for the radial and azimuthal plane in an axisymmetric to reduce the separation length means of periodic excitation at the diffuser





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