Calculation of the buoyant motion of a turbulent planar heated jet in an opposing air stream
Series: Air Force surveys in geophysics -- no. 385; AFGL-TR -- 78-0072
Publisher: Meteorology Division, Air Force Geophysics Laboratory
Published: 1978
Place of publication: Hanscom AFB, Mass
Language: eng
Number of pages: 34
Subjects: Jets; Fluid dynamics; Experiments; Fog; Control; Mathematical models
Description: 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.
Notes: Includes bibliographical references (p. 31).