Laser Diagnostic Development And Measurement And Modeling Of Turbulent Flowfields Of Jets And Wakes
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Laser Diagnostic Development And Measurement And Modeling Of Turbulent Flowfields Of Jets And Wakes
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Author :
language : en
Publisher:
Release Date : 1983
Laser Diagnostic Development And Measurement And Modeling Of Turbulent Flowfields Of Jets And Wakes written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.
Laser Diagnostic Development And Measurement And Modeling Of Turbulent Flowfields Of Jets And Wakes
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Author : A. J. Lightman
language : en
Publisher:
Release Date : 1983
Laser Diagnostic Development And Measurement And Modeling Of Turbulent Flowfields Of Jets And Wakes written by A. J. Lightman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Anemometer categories.
A two-dimensional laser Doppler anemometer was designed to take measurements in a ducted coaxial flow system having a centerbody separating the jets. The measurements, made in isothermal flow, can be categorized as: central jet only (C02); annular jet only (air); and, combined central and annular jet flow. Radial profiles of the axial and radial/azimuthal velocity were obtained. The central jet only condition approximates a free jet since the central jet diameter is much smaller than the centerbody or duct diameter (1:29.3: 53.2). Measurements of the jet development (diameter, turbulence intensity, etc.) were compared with previous free jet studies. In a study of the isotropy of the turbulent fluctuations it was determined that fully developed turbulent flow begins further downstream than anticipated. Velocity profiles were combined with gas sampling measurements to ascertain jet entrainment. Results show a linear growth of the entrained mass starting at the entrance plane. Downstream (20 diameters) the rate of growth increases to match past studies in that region. The annular jet flow creates a recirculation vortex in the wake of the centerbody. The flowfield was mapped and the streamlines describing the flow were obtained throughout the recirculating flow and further downstream. The location and strength of the vortex center was determined. Velocity scanes were combined to obtain profiles of the average radial and azimuthal components that were directly measured. The interaction of the recirculating annular air jet and the central get was examined. Profiels of the velocity field were obtained for several central jet flow conditions. A normalization plot of the location of the central jet stagnation location agreed well with earlier measurements using a one-dimensional laser doppler anemometer and a different central jet nozzle.
Laser Diagnostic Development And Measurement And Modeling Of Turbulent Flowfields Of Jets And Wakes Part Ii
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Author : L. Krishnamurthy
language : en
Publisher:
Release Date : 1983
Laser Diagnostic Development And Measurement And Modeling Of Turbulent Flowfields Of Jets And Wakes Part Ii written by L. Krishnamurthy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.
Laser Diagnostic Development And Measurement And Modeling Of Turbulent Flowfields Of Jets And Wakes
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Author : S. O. Park
language : en
Publisher:
Release Date : 1983
Laser Diagnostic Development And Measurement And Modeling Of Turbulent Flowfields Of Jets And Wakes written by S. O. Park and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Gas flow categories.
Finite-difference numerical computations are presented to predict the isothermal, turbulent, recirculating flowfields in a centerbody combustor configuration which involves confined dual coaxial jet mixing in the near-wake region of an axisymmetric bluff body. Calculations based upon the Reynolds-averaged Navier-Stokes equations and the k-epsilon turbulence model consider the influence of the annular and central flow rates on the nature of the flowfield downstream of the bluff body. The reported isothermal modeling calculations are performed with the 'Teaching Elliptic Axisymmetrical Characteristics Heuristically' (TEACH) Code. Numerical results show the influence of the annular and central jet flow rates on the distributions of the mean and rms velocity fields and centerline locations of stagnation points. The sensitivity of the predicted results to several aspects of the modeling is considered. The predicted results demonstrate the complexity of flowfield interactions in the near-wake region and refine the understanding of the centerbody combustor flowfields. The character of the recirculating flowfield emerging from the numerical predictions when the near-wake is dominated by the annular jet is in conformity with experimental observations.
Laser Diagnostic Development And Measurement And Modeling Of Turbulent Flowfields Of Jets And Wakes
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Author : P. P. Yaney
language : en
Publisher:
Release Date : 1983
Laser Diagnostic Development And Measurement And Modeling Of Turbulent Flowfields Of Jets And Wakes written by P. P. Yaney and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Gas flow categories.
The design and performance of a photon counting, two-channel spectroscopic system using the 6-W, 448-nm line of a cw argon ion laser is described. The two channels are formed by use of cylindrical optics and special slit mirrors set up following the exit slit of a conventional double spectrometer. The system is capable of dynamic, simultaneous measurements of either the concentrations of two gas species in cold flow or the temperature and concentration of a single gas species, such as N2, in a flame. Measurements are accomplished by recording the intensities of two spontaneous rotational Raman lines with spectral bandwidths between 0.04 and 0.08 nm. Up to 4096 samples (or reads from each of the two channels) can be recorded by a dedicated minicomputer at rates up to 10 kHz. Studies of a CH4 diffusion flame at sampling rates of 20 to 100 Hz and a room-temperature, axisymmetric C02 jet at rates up to 2.0 kHz were carried out. Analysis of the data from these studies include mean and rms profiles, probability density functions (pdf's), power spectral density functions, autocorrelation functions, cross correlation functions, and determinations of skewness and kurtosis in the pdf's and the C02 fluctuations.
Laser Diagnostic Development And Measurement And Modeling Of Turbulent Flowfields Of Jets And Wakes Part 3 The Development Of A Two Channel Cw Time Resolved Laser Raman Spectroscopy Tilars System For Measurements In Gas Flowfields
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Author : P. P. Yaney
language : en
Publisher:
Release Date : 1983
Laser Diagnostic Development And Measurement And Modeling Of Turbulent Flowfields Of Jets And Wakes Part 3 The Development Of A Two Channel Cw Time Resolved Laser Raman Spectroscopy Tilars System For Measurements In Gas Flowfields written by P. P. Yaney and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.
The design and performance of a photon counting, two-channel spectroscopic system using the 6-W, 448-nm line of a cw argon ion laser is described. The two channels are formed by use of cylindrical optics and special slit mirrors set up following the exit slit of a conventional double spectrometer. The system is capable of dynamic, simultaneous measurements of either the concentrations of two gas species in cold flow or the temperature and concentration of a single gas species, such as N2, in a flame. Measurements are accomplished by recording the intensities of two spontaneous rotational Raman lines with spectral bandwidths between 0.04 and 0.08 nm. Up to 4096 samples (or reads from each of the two channels) can be recorded by a dedicated minicomputer at rates up to 10 kHz. Studies of a CH4 diffusion flame at sampling rates of 20 to 100 Hz and a room-temperature, axisymmetric C02 jet at rates up to 2.0 kHz were carried out. Analysis of the data from these studies include mean and rms profiles, probability density functions (pdf's), power spectral density functions, autocorrelation functions, cross correlation functions, and determinations of skewness and kurtosis in the pdf's and the C02 fluctuations.
Laser Diagnostic Development And Measurement And Modeling Of Turbulent Flowfields Of Jets And Wakes
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Author : L. Krishnamurthy
language : en
Publisher:
Release Date : 1983
Laser Diagnostic Development And Measurement And Modeling Of Turbulent Flowfields Of Jets And Wakes written by L. Krishnamurthy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Gas flow categories.
Finite-difference numerical computations are presented to predict the isothermal, turbulent, recirculating flowfields in a centerbody combustor configuration which involves confined dual coaxial jet mixing in the near-wake region of an axisymmetric bluff body. Calculations based upon the Reynolds-averaged Navier-Stokes equations and the k-epsilon turbulence model consider the influence of the annular and central flow rates on the nature of the flowfield downstream of the bluff body. The reported isothermal modeling calculations are performed with the 'Teaching Elliptic Axisymmetrical Characteristics Heuristically' (TEACH) Code. Numerical results show the influence of the annular and central jet flow rates on the distributions of the mean and rms velocity fields and centerline locations of stagnation points. The sensitivity of the predicted results to several aspects of the modeling is considered. The predicted results demonstrate the complexity of flowfield interactions in the near-wake region and refine the understanding of the centerbody combustor flowfields. The character of the recirculating flowfield emerging from the numerical predictions when the near-wake is dominated by the annular jet is in conformity with experimental observations.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
Energy Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1985
Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Power resources categories.
Government Reports Announcements Index
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Author :
language : en
Publisher:
Release Date : 1984
Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Science categories.