Experimental Investigation Of The Velocity Field Of A Jet In A Crossflow
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Experimental Investigation Of The Velocity Field Of A Jet In A Crossflow
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Author : Thomas Albert Trovillion
language : en
Publisher:
Release Date : 1972
Experimental Investigation Of The Velocity Field Of A Jet In A Crossflow written by Thomas Albert Trovillion and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Aerodynamics categories.
Induces Velocity Field Of A Jet In A Crossflow
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Author : Richard L. Fearn
language : en
Publisher:
Release Date : 1978
Induces Velocity Field Of A Jet In A Crossflow written by Richard L. Fearn and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Jets categories.
An experimental investigation of a subsonic round jet exhausting perpendicularly from a flat plate into a subsonic crosswind of the same temperature was conducted. Velocity and pressure measurements were made in planes perpendicular to the path of the jet for ratios of jet velocity to crossflow velocity ranging from 3 to 10. The results of these measurements are presented in tabular and graphical forms. A pair of diffuse contrarotating vortices is identified as a significant feature of the flow, and the characteristics of the vortices are discussed.
Experimental Investigation Of A Jet Impinging On A Ground Plane In The Presence Of A Cross Flow
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Author : J. M. Cimbala
language : en
Publisher:
Release Date : 1987
Experimental Investigation Of A Jet Impinging On A Ground Plane In The Presence Of A Cross Flow written by J. M. Cimbala and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Cross-flow (Aerodynamics). categories.
An Experimental Study Of The Velocity Field Of A Transverse Jet Injected Into A Supersonic Crossflow
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Author : Juan Gabriel Santiago
language : en
Publisher:
Release Date : 1995
An Experimental Study Of The Velocity Field Of A Transverse Jet Injected Into A Supersonic Crossflow written by Juan Gabriel Santiago and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.
The design of a supersonic combustor which uses transverse jet injection into a supersonic flow (TJISF) as a means of fuel injection and mixing requires a fundamental understanding of these flows. Such knowledge may also serve studies of the thrust vector control of rocket nozzles, the cooling of nozzle walls, and jet reaction force prediction. The present investigation is a quantitative, experimental study of a single, sonic, underexpanded, transverse jet injected into a Mach 1.6 crossflow. The motivation for this research program is to improve the fundamental understanding of the fluid dynamic mechanisms and mixing processes in this flow. Schlieren/shadowgraph photography, surface flow visualization, and two-component, frequency pre-shifted laser Doppler velocimetry (LDV) data have been obtained. Four LDV optical arrangements have been used to measure all three mean velocity components, five of the six kinematic Reynolds stresses, and the turbulent kinetic energy. The LDV system is equipped with a computer-controlled traverse system and has been used to provide velocity measurements at over 4,000 locations throughout the TJISF flowfield. The study focuses on the transverse, midline plane and two crossflow planes. The majority of the measurements in these planes has been made in the high gradient regions of the jet plume. Measurements of the mean and turbulent velocity fields helped resolve important issues in the study of the TJISF flowfield. These issues include the size and orientation of the recirculation regions upstream and downstream of the jet (including the horseshoe vortex just upstream of the jet); the structure and strength of the bow shock, barrel shock, and Mach disk; the structure, strength, and development of the kidney-shaped, counter-rotating vortex pair; the growth of the annular shear layer between the jet plume and the crossflow; the growth of the boundary layer beneath the jet plume; the Reynolds stress fields of the flow; the production of turbulent kinetic energy; and the degree of anisotropy of the turbulent stresses in this flow. In addition, the present study provides validation data for analytical and numerical predictions of the TJISF flowfield.
An Experimental Investigation Of A Turbulent Jet In A Cross Flow
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Author : David Kenneth Mosher
language : en
Publisher:
Release Date : 1970
An Experimental Investigation Of A Turbulent Jet In A Cross Flow written by David Kenneth Mosher and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Jets categories.
The interference phenomenon occurring when a subsonic turbulent jet exhausts normally from a large flat plate into a low speed crossflow was experimentally investigated in the Georgia Tech nine foot wind tunnel. Static pressures were measured on the surface around the jet. In the region off the surface, including the jet plume, wake and surrounding areas, the average total and static pressures and the average velocity magnitudes and directions were determined. Three jet exit configurations were studied, one circular and two slot-shaped with width to length ratios of 0.3 and 3.4. All have the same exit area. The effective jet to cross-flow velocity ratio was varied, for each of the exit configurations, over the range 4.0 to 12.0. Analysis of the data indicates that the pressure distributions induced on the surface are a combined result of the jet's blocking and entraining effects on the cross flow with entrainment becoming the more dominant of the two as the effective velocity ratio is increased. This relative dominance brings about an attenuation of total interference lift loss (when computed as a fraction of gross thrust) primarily by causing a rise in the low pressures in the wake region as the effective velocity ratio increases. When the effective velocity ratio is held fixed, the total interference lift loss increases with increasing width to length ratio of the jet exit. (Author).
An Experimental Investigation Into The Velocity Field Of A Pulsed Core Jet
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Author : Richard Douglas Watson
language : en
Publisher:
Release Date : 1978
An Experimental Investigation Into The Velocity Field Of A Pulsed Core Jet written by Richard Douglas Watson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Air jets categories.
An Experimental Investigation Of The Velocity Field In Axisymmetric Free Turbulent Jets Of Non Newtonian Fluids
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Author : Robert William Serth
language : en
Publisher:
Release Date : 1969
An Experimental Investigation Of The Velocity Field In Axisymmetric Free Turbulent Jets Of Non Newtonian Fluids written by Robert William Serth and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with categories.
An Experimental Investigation Of Flow Surrounding An Airfoil With A Jet Exhausting From The Lower Surface
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Author : Anjaneyulu Krothapalli
language : en
Publisher:
Release Date : 1982
An Experimental Investigation Of Flow Surrounding An Airfoil With A Jet Exhausting From The Lower Surface written by Anjaneyulu Krothapalli and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Aerodynamics categories.
An Experimental Study Of The Structure And Acoustic Field Of A Jet In A Cross Stream
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Author : Ivan Camelier
language : en
Publisher:
Release Date : 1976
An Experimental Study Of The Structure And Acoustic Field Of A Jet In A Cross Stream written by Ivan Camelier and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Aerodynamics categories.
The Entrainment And Mixing Of A Round Buoyant Turbulent Jet In Cross Flow
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Author : David Charles Thoman (Jr)
language : en
Publisher:
Release Date : 1991
The Entrainment And Mixing Of A Round Buoyant Turbulent Jet In Cross Flow written by David Charles Thoman (Jr) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
This thesis summaries the results of an experimental investigation of the near-field behavior and physics of the round buoyant turbulent jet in crossflow. In particular, the study centers on the physics associated with entrainment and mixing phenomena of the jet with the goal of better understanding the trends of trajectory and dilution behavior. The experiments involved a downward discharge of cold nitrogen gas (at about $-$85$spcirc$C) from a cylindrical structure placed in a wind tunnel of horizontally flowing ambient air. The jet was mapped using thermocouple measurements. For the purpose of studying jet/crossflow and jet/wake interactions, fog-oil smoke was used to mark parcels of fluid in the crossflow upstream of the jet and in the wake flow downstream of the discharge structure. Time-averaged, smoke concentrations were gathered through an aspirated sampling probe in conjunction with a calibrated, optical aerosol monitor. Smoke distributions were also photographed. Experiments were performed for four different values for the crossflow-to-exit velocity ratio k, namely, k = 0.7, 1.3, 2.1, and 3.5. The results of the experiments yield a comprehensive picture of the near-field flow patterns, flow interactions, and flow-transport physics for a buoyant jet in crossflow. Key, phenomenologically distinct zones of flow which comprise the near-exit structure of the jet are identified. The flow patterns within these zones, and thus the structure of the near-exit jet, are found to be extremely dependent on the value of the velocity ratio. Flow interactions in this region establish flow patterns which have a pronounced influence on the downstream development of the jet. A method is developed to fully document the trajectory and dilution behavior of the jet with the key parameters of influence. Trajectory and dilution are found to correlate with two parameters, namely, the velocity ratio and the density-difference ratio. Finally, unsteady, large-scale mixing motions within the near-exit flow zones are documented. Distinct modes of large-scale mixing which are responsible for the rapid and extensive dispersion observed in the jet are revealed by this study.
