Calculation Of The Buoyant Motion Of A Turbulent Planar Heated Jet In An Opposing Air Stream

Author : Milton M. Klein
Publisher : Unknown
Page : 40 pages
File Size : 55,5 Mb
Release : 1978
Category : Fog
ISBN : UOM:39015095138403

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Calculation of the Buoyant Motion of a Turbulent Planar Heated Jet in an Opposing Air Stream by Milton M. Klein Pdf

A broad experimental and theoretical program is being conducted to aid in the development of an operational warm fog dispersal system which utilizes momentum driven ground based heat sources. To help determine optimum heat and thrust combinations for the system, investigations are being made of the buoyant motion of heated turbulent jets both coflowing (wind and jet in the same direction) and counterflowing (wind and jet opposite). The investigation of the coflowing jet has been completed and in addition a model has been developed from which the dynamic characteristics of a heated counterflowing jet in the absence of buoyancy can be calculated. The present investigation is concerned with the effect of buoyancy upon the motion of a counterflowing jet. The lower portion of the trajectory, which has been calculated by the present model, is in fair to good agreement with the corresponding experimental curve, the calculated curve tending to be somewhat higher than that obtained experimentally. The calculated upper part of the trajectory, obtained from a model which gives the deflection of a jet in a crosswind, is in good agreement with experiment.

Author : Anonim
Publisher : Unknown
Page : 414 pages
File Size : 44,9 Mb
Release : 1977
Category : Geophysics
ISBN : OSU:32435027525872

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Air Force Surveys in Geophysics by Anonim Pdf

Author : Bruce A. Kunkel
Publisher : Unknown
Page : 36 pages
File Size : 50,8 Mb
Release : 1978
Category : Aeronautics
ISBN : UOM:39015095138742

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A Modern Thermo-kinetic Warm Fog Dispersal System by Bruce A. Kunkel Pdf

An extensive investigation has been made to arrive at optimum specifications for a thermo-kinetic warm fog dispersal system. This study included passive heat tests, sub-scale heat/momentum tests, and tests with a single full-scale runway combustor and an approach zone combustor. These tests were augmented with extensive analytical modeling of buoyant jets under coflowing and counterflowing wind conditions. The landing category and the operational requirements within each category are the primary factors affecting the size of the thermal fog dispersal system (TFDS). A Cat 2 TFDS employs 22 percent fewer combustors and uses 50 percent less fuel than a Cat 1 TFDS. The combustor specification and orientation are presented for both Cat 1 and Cat 2 systems. (Author).

Author : Air Force Cambridge Research Laboratories (U.S.)
Publisher : Unknown
Page : 228 pages
File Size : 52,5 Mb
Release : 1976
Category : Geophysics
ISBN : UOM:39015095139955

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Report on Research at AFCRL. by Air Force Cambridge Research Laboratories (U.S.) Pdf

Author : Anonim
Publisher : Unknown
Page : 1572 pages
File Size : 54,9 Mb
Release : 1992
Category : Aeronautics
ISBN : UIUC:30112078757413

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Scientific and Technical Aerospace Reports by Anonim Pdf

Author : Milton M. Klein,Bruce A. Kunkel
Publisher : Unknown
Page : 48 pages
File Size : 50,7 Mb
Release : 1975
Category : Atmospheric temperature
ISBN : UOM:39015095126150

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Interaction of a Buoyant Turbulent Planar Jet with a Co-flowing Wind by Milton M. Klein,Bruce A. Kunkel Pdf

The classic theory of buoyant motion of a free planar heated jet in still air is extended to account for environmental winds from the same direction as the jet, that is, co-flowing winds. The model is applicable for wind and jet velocities up to 100 m/sec, and jet temperatures up to three times the ambient. Calculations are made for initial jet velocities of 5 and 20 m/sec and temperature excesses, relative to ambient temperature, of 0.3 and 1. For light winds relative to the initial jet velocity the vertical velocity and centerline trajectory of the plume rise rapidly with distance from the jet source. This is similar to that found with the classic theory for still air. As the wind speed approaches the initial jet velocity, the rise of the jet plume with distance from the source is much more gradual. For all wind speeds, the axial jet velocity and temperature decrease rapidly with distance from the jet source, until they become almost constant at short distances downstream. A similarity rule is derived which preserves dynamic similarity in scaling from a given system to another system. For low wind speeds the procedure is close to that based on constant Froude number. (Author).

Author : Technology Reports Centre (Great Britain)
Publisher : Unknown
Page : 218 pages
File Size : 46,5 Mb
Release : 1978
Category : Electronic
ISBN : STANFORD:36105016774965

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R & D Abstracts by Technology Reports Centre (Great Britain) Pdf

Author : Milton M. Klein,Bruce A. Kunkel
Publisher : Unknown
Page : 44 pages
File Size : 53,8 Mb
Release : 1975
Category : Atmospheric temperature
ISBN : UOM:39015095135169

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Interaction of a Buoyant Turbulent Round Jet with a Co-flowing Wind by Milton M. Klein,Bruce A. Kunkel Pdf

A broad effort is being conducted to develop an operational Warm Fog Dispersal System (WFDS) using ground-based heat sources. In order to determine the optimum heat and thrust for the combustors in the WFDS, investigations have been made of the buoyant motion in round- and plane-heated turbulent jets in co-flowing (that is, same direction) wind fields. This report describes a method of calculating the round jet case. The method can be used for jet velocities of 100m/sec or less, wind velocities below or equal to the jet velocity, and jet temperatures up to 3 times the ambient value. Initial jet velocities of 5 and 20m/sec and temperature excesses, relative to the ambient temperature, of .3 and 1 were selected for the calculations.

Author : Anonim
Publisher : Unknown
Page : 498 pages
File Size : 50,8 Mb
Release : 1979
Category : Astrophysics
ISBN : UOM:39015034725047

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Meteorological and Geoastrophysical Abstracts by Anonim Pdf

Covering the world's literature on meteorology, climatology, atmospheric chemistry and physics, physical oceanography, hydrology, glaciology, and related environmental sciences.

Author : Anonim
Publisher : Unknown
Page : 1316 pages
File Size : 41,8 Mb
Release : 1984
Category : Government reports announcements & index
ISBN : MINN:30000008704326

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Government Reports Annual Index by Anonim Pdf

Author : Anonim
Publisher : Unknown
Page : 1374 pages
File Size : 41,8 Mb
Release : 1978-10
Category : Science
ISBN : CORNELL:31924055260891

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Government Reports Announcements & Index by Anonim Pdf

Author : Anonim
Publisher : Unknown
Page : 400 pages
File Size : 54,6 Mb
Release : 1948
Category : Mechanics, Applied
ISBN : OSU:32435026160655

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Applied mechanics reviews by Anonim Pdf

Author : Milton M. Klein
Publisher : Unknown
Page : 36 pages
File Size : 54,8 Mb
Release : 1977
Category : Aerothermodynamics
ISBN : UOM:39015095137496

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Interaction of a Turbulent Planar Heated Jet with a Counterflowing Wind by Milton M. Klein Pdf

Experimental and theoretical programs are being conducted to aid in the development of an operational warm fog dispersal system using momentum-driven ground-based heat sources. In previous investigations, the wind was in the same direction as the jet (coflowing). The present investigation is concerned with a jet opposite in direction to the ambient wind (counterflowing or opposing jet). A model for calculating the dynamic characteristics of a cold counter-flowing jet has been extended to take account of the effect of heating upon the jet. The effect of buoyancy upon the motion of the jet will be presented in a subsequent report.

Author : Anonim
Publisher : Unknown
Page : 1358 pages
File Size : 44,6 Mb
Release : 1992
Category : Physics
ISBN : UOM:39015026182769

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Physics Briefs by Anonim Pdf

Author : Anonim
Publisher : Unknown
Page : 1044 pages
File Size : 43,9 Mb
Release : 1999
Category : Aeronautics
ISBN : STANFORD:36105021812214

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International Aerospace Abstracts by Anonim Pdf