Exploratory investigation of static- and base-pressure increases resulting from combustion of aluminum borohydride adjacent to body of revolution in supersonic wing tunnel Page: 4 of 50
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NACA RM E57E15
S body length, 21 in.
M Mach number
p static pressure, in. of Hg
Re Reynolds number (based on free-stream conditions and body length)
to time interval during combustion measured from instant of ignition
as seen in high-speed motion pictures, sec
zrgp cylindrical coordinate system (see sketch with table I)
7 ratio of specific heats, isentropic exponent
b base conditions
c with combustion
a free-stream conditions
APPARATUS AND PROCEDURE
The apparatus consisted of a supersonic wind tunnel, model, transient
and steady-state pressure instrumentation, fuel-injection system, and a
Wind Tunnel and Model
A 1- by 1-foot nonreturn-type wind tunnel operating at a Mach number
of 2.47 was used in this investigation. Total temperature and pressure
of approximately 1000 F ahd 47.8 inches of mercury, respectively, were
maintained during the combustion runs.- The dew point was held at -550 F
or lower. The model was positioned in the tunnel (fig. 1) so that the base
of the model was 2 inches upstream of the center of the ll-inch-diameter
windows; the windows were used for schlieren and other types of observa-
tion. This position of the model was chosen because, the model being
longer than the window, the flow around the base was of greatest interest.
The model and sting support used in this investigation are shown in
figure 2. The near-parabolic forebody of the model was 10.5 inches long.
The cylindrical afterbody was also 10.5 inches long with a cylinder di-
ameter of 1.75 inches. This model was studied in a previous aerodynamic
investigation at a Mach number of 3.12 (ref. 13).
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Serafini, John S.; Dorsch, Robert G. & Fletcher, Edward A. Exploratory investigation of static- and base-pressure increases resulting from combustion of aluminum borohydride adjacent to body of revolution in supersonic wing tunnel, report, October 2, 1957; (digital.library.unt.edu/ark:/67531/metadc63626/m1/4/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.