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Title: Experimental Characterization of an Axisymmetric Swirling Wake

ORCiD logo [1];  [2];  [2]
  1. Los Alamos National Laboratory
  2. University of Wyoming
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: The 3rd International Conference on Future Technologies in Wind Energy (WindTech 2017) ; 2017-10-24 - 2017-10-26 ; Boulder, Colorado, United States
Country of Publication:
United States
Energy Sciences; wakes, turbulence, wind turbine, array losses

Citation Formats

Holmes, Marlin Jamell, Naughton, Jonathan W, and DeMillard, Eric J. Experimental Characterization of an Axisymmetric Swirling Wake. United States: N. p., 2017. Web.
Holmes, Marlin Jamell, Naughton, Jonathan W, & DeMillard, Eric J. Experimental Characterization of an Axisymmetric Swirling Wake. United States.
Holmes, Marlin Jamell, Naughton, Jonathan W, and DeMillard, Eric J. 2017. "Experimental Characterization of an Axisymmetric Swirling Wake". United States. doi:.
title = {Experimental Characterization of an Axisymmetric Swirling Wake},
author = {Holmes, Marlin Jamell and Naughton, Jonathan W and DeMillard, Eric J},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month =

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  • A numerical and experimental study of a confined strong swirling flow is presented. Detailed velocity measurements are made using a two-component laser Doppler velocimeter (LDV) technique. Computations are performed using a differential second-moment (DSM) closure. The effect of inlet dissipation rate on calculated mean and turbulence fields is investigated. Various model constants are employed in the pressure-strain model to demonstrate their influences on the predicted results. Finally, comparison of the DSM calculations with the algebraic second-monent (ASM) closure results shows that the DSM is better suited for complex swirling flow analysis. 14 refs.
  • Both the droplets and continuous phase (gas in the presence of the droplets) downstream of a 3x model combustor dome swirl cup are characterized in the absence of reaction. Continuous-phase and droplet velocities as well as droplet size were measured using phase Doppler interferometry. The measurements reveal that: (1) at the exit plane of the swirl cup assembly, more uniform and finer droplets are produced relative to the atomizer alone; (2) both the continuous phase and the droplets recirculate; (3) the location at which droplets join the recirculation is correlated with droplet size; and (4) significant slip velocities between themore » continuous phase and the droplets reflect a strong momentum exchange between the phases. 12 refs.« less
  • The excitation of a static (w = 0) magnetic field mode in a plasma has been theorized for close to 30 years, but has never been observed experimentally. This mode has also been referred to alternatively as the picket fence or free streaming mode, reflecting the fact that it is supported by steady state current loops with alternating sense of direction (k * 0) in the plasma. The authors present PIC simulations and preliminary experimental results of work being done at USC and UCLA to measure the free streaming mode when a moving gas/plasma boundary (e.g., created by a shortmore » laser pulse) moves either through a static electric field (e.g., an electric wiggler) or an incident electromagnetic wave. Comparisons of the experimental and simulations results with analytical results are also presented.« less
  • Abstract not provided.
  • More than four years after the initial proposal of the Plasma Wake-field Accelerator (PWFA), it continues to be the object of much investigation, due to the promise of the ultra-high accelerating gradients that can exist in relativistic plasma waves driven in the wake of charged particle beams. These large amplitude plasma wake-fields are of interest in the laboratory, both for the wealth of basic nonlinear plasma wave phenomena which can be studied, as well as for the applications of acceleration of focusing of electrons and positrons in future linear colliders. Plasma wake-field waves are also of importance in nature, duemore » to their possible role in direct cosmic ray acceleration. The purpose of the present work is to review the recent experimental advances made in PWFA research at Argonne National Laboratory, in which many interesting beam and plasma phenomena have been observed. Emphasis is given to discussion of the nonlinear aspects of the PWFA beam-plasma interaction. 29 refs., 13 figs.« less