Variation with Mach Number of Static and Total Pressures Through Various Screens Page: 6 of 28
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2 NACA CB No. L5F28
M Mach number ahead of screen
Mchoke choking Mach niunber, also known as limiting
Mach number, the Mach number ahead of
screen at which a Mach number of 1 is
obtained completely across openings in
AH total-pressure loss through screen
Ap static-pressure drop through screen
q dynamic pressure ahead of screen
Cd section drag coefficient (Drag/Unit area)
m mesh, wires per inch
d wire diameter, inch
S screen solidity, ratio of blocked area to
original free area (2md - m2d2)
P1 - density ahead of screen
U1 velocity ahead of screen
u2 velocity downstream from screen
APPARATUS AND METHODS
The Langley 24-inch high-speed tunnel, in which
these tests were run, is a nonreturn, induction-type
tunnel with the induction nozzle placed downstream from
the test section (reference 1). The total pressure
throughout the test section is therefore equal to atmos-
pheric pressure, except for a negligible loss through the
Each screen was supported for tests within a
16-inch length of seamless steel tubing having an inside
diameter of 51 inches (fig. 1), which was mounted
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Adler, Alfred A. Variation with Mach Number of Static and Total Pressures Through Various Screens, report, February 1946; (https://digital.library.unt.edu/ark:/67531/metadc62531/m1/6/: accessed June 1, 2020), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.