Investigation of the Penetration of an Air Jet Directed Perpendicularly to an Air Stream Page: 2 of 14
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
TECHNICAL NOTE No. 1615
INVESTIGATION OF THE PENETRATION OF AN AIR JET
DIRECTED PERPENDICULARLY TO AN AIR STREAM
By Edmund E. Callaghan and Robert S. Ruggeri
SUMMARY
An experimental investigation was conducted to determine the
penetration of a circular air jet directed perpendicularly to an
air stream as a function of jet density, jet velocity, air-stream
density, air-stream velocity, jet diameter, and distance downstream
from the jet. The penetration was determined for nearly constant
values of air-stream density at two tunnel velocities, four jet
diameters, four positions downstream of the jet, and for a large
range of jet velocities and densities. An equation for the pene-
tration was obtained in terms of the jet diameter, the distance
downstream from the jet, and the ratios of jet and air-stream
velocities and densities.
INTROIDUC TION
The introduction of a gas or vapor into an air stream for the
purpose of heating the air stream by mixing or burning often neces-
sitates rapid mixing of the gas or the vapor with the air stream.
The high degree of turbulence created by a jet directed perpen-
dicularly to an air stream offers a means of obtaining satisfactory
mixing. The jet must rapidly penetrate the air stream in order
that this mixing be accomplished in a short distance. One method
of obtaining adequate penetration is the utilization of the kinetic
energy of a high-velocity jet.
An investigation to determine the penetration of a high-
velocity circular air jet directed perpendicularly to an air stream
was undertaken in a 2- by 20-inch-duct tunnel at the NACA Cleveland
laboratory. The penetration at several positions downstream of the
jet was determined at tunnel velocities of 260 and 360 feet per
second for four jet (orifice) diameters and a range of orifice
pressure drops from 5 to 50 inches of mercury.
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Callaghan, Edmund E. & Ruggeri, Robert S. Investigation of the Penetration of an Air Jet Directed Perpendicularly to an Air Stream, report, June 1948; (https://digital.library.unt.edu/ark:/67531/metadc53523/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.