Variation with Mach Number of Static and Total Pressures Through Various Screens Page: 5 of 28
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NACA CB Nt.: L.5F28 : is : :
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
VARIATION WITH MACH NUMBER OF STATIC AND TOTAL
PRESSURES THROUGH VARIOUS SCREENS
By Alfred A. Adler
Tests were conducted in the Langley 24-inch high-
speed tunnel to ascertain the static-pressure and total-
pressure losses through screens ranging in mesh from
3 to 12 wires per inch and in wire diameter from 0.023
to 0.041 inch. Data were obtained from a Mach number
of approximately 0.20 up to the maximum (choking) Mach
number obtainable for each screen.
The results of this investigation indicate that
the pressure losses increase with increasing Mach number
until the choking Mach number, which can be computed, is
reached. Since choking imposes a restriction on the
mass rate of flow and maximum losses are incurred at
this condition, great care must be taken in selecting
the screen mesh and wire diameter for an installation
so that the choking Mach number is .not approached at
the maximum operating velocity.
In the design of ducts for aircraft it has become
necessary to know the losses in static and total pressure
through screens installed within these ducts. Data on
the losses through screens at low speeds have long been
available, but for current aircraft ducting problems
data on the losses through screens at high speeds are
necessary. Tests were therefore -conducted in the
Langley 24-inch high-speed tunnel to ascertain the
static-pressure and total-pressure losses through
screens ranging in mesh.from 3 to 12 wires per inch and
in wire diameter from 0.023 to 0.0l1 inch, at Mach
numbers from approximately 0.20 to the maximum (choking)
Mach number obtainable for each screen.
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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/m1/5/: accessed June 6, 2020), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.