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 Section 4:
HUSH-HOUSE AND TEST CELL GEOMETRICAL DATA
AND INSTRUMENTATION DEFINITION
4.1
Hush-House Geometrical Data. Table 4 contains tabular geometrical
information for all of the existing Navy hush-houses. Figures 1 (Miramar), 2
(El Toro), 3 and 4 (Patuxent River) and 5 (Dallas) include dimensioned plan
and side elevation views of the existing Navy dry-cooled runup facilities.
The geometrical information on Table 4 includes inlet net areas, augmenter
duct area, etc., as well as linear dimensions. Figures 1, 2, 4 and 5 also
show the location of permanent pressure and temperature instrumentation
provided with each facility. P+encl, data are taken during engine trim runs.
The augmenter wall temperatures indicate overtemperature during normal runs.
All of this instrumentation was used during the facility checkouts, reported
herein.
4.2
Pressure/Temperature Instrumentation. For postconstruction facility
checkout, additional instrumentation was provided to measure air inlet static
pressures (reduced to inlet mass flow rate), enclosure interior dynamic
pressure (reduced to enclosure velocity), and augmenter exit total pressures
and temperatures (reduced to augmenter exit velocity). Figure 3 shows the
location of augmenter exit rakes used during the Miramar No. 2 and El Toro
checkouts.
4.3
Postconstruction Noise Data Collection. Extensive noise data were
also taken during postconstruction facilities checkouts. Microphones were
located externally at 30 deg. intervals on a 250 ft (76.2 m) radius circle
centered on the engine exhaust plane location. In addition, there was usually
one microphone located at 1000 ft (304.8 m) from the engine exhaust plane.
Microphones were also placed inside the aircraft or engine enclosure alongside
the aircraft or engine and data taken that could be compared with the free
field measurements. Noise data are discussed in Sections 11 and 12.
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