Effects of internal corner fillets on pressure recovery: Mass flow characteristics of scoop-type conical supersonic inlets Page: 5 of 15
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4 . EN I NACA RM E52J10
As would be expected, with no boundary-layer removal, the pressure
recoveries of the inlets with and without corner fillets were relatively
low (fig. 4). At MO = 1.49 (fig. 4(a)), the use of fillets did not
appreciably affect the pressure recoveries at low mass flows. Near
critical mass flow, however, the pressure recoveries of the inlets with
corner fillets were approximately 12 percent hi her than those of the
inlets without fillets. At M = 1.78 (fig. 4(b)), the pressure recov-
eries of the inlets without corner fillet were considerably lower than "
those of the inlets employing fillets throughout the range of mass flow
investigated. Also, the stable operating range of the inlets was extended -
slightly by using fillets. At M0 = 1.97 (fig. 4(c)), the use of fil-
lets did not appreciably increase the pressure recoveries of the inlets;
however, the stable operating range was extended slightly. Critical
mass flow ratios of the inlets were not affected by corner fillets at any
of the Mach numbers investigated.
The variation of the pressure recoveries with mass flow for the
h/b = 1.0 condition is presented in figure 5 and indicates a substan-
tial improvement in pressure recovery and mass flow characteristics com-
pared with the h/b = 0 configuration (fig. 4). The same critical mass
flows were obtained for the inlets with and without corner fillets; how-
ever, the use of fillets resulted in slight gains in pressure recoveries.
The critical pressure recovery at M0 = 1.97 (fig. 5(c)) increased from
76 to 81 percent when corner fillets were employed. The stable operating
range of the inlets with fillets was also increased slightly.
For the inlets with fillets, not only was the level of the total
pressure higher, but the velocity distribution at the diffuser discharge
station was much more uniform. This is illustrated by the contour maps
(fig. 6) of the measured total-pressure recoveries for the inlets with
and without corner fillets operating at M0 = 1.97 with h/ of 1.0.
The pressure recovery - mass flow characteristics of the h/B = 2.0
configuration are presented in figure 7. Increasing h/B resulted in
an appreciable decrease in critical pressure recovery and a slight
decrease in critical mass flow ratio. This decrease in pressure recovery
is consistent with the trend reported in reference 2 which indicated
decreasing pressure recovery when h/ was increased to values near
unity. The results obtained with the h/5 = 2.0 configuration also
indicated that improvements in pressure recoveries can be obtained by
use of internal corner fillets. The peak pressure recovery at MO = 1.97
was increased 7 percent over that of the inlets without corner fillets.
A summary of the pressure recoveries obtained at the critical mass
flows of the inlets with and without fillets is presented in figure 8.
For the h/b = 0 condition (fig. 8(a)), little gain in critical pressure
recovery was realized at M5 = 1.97. However, at MO = 1.49 and 1.78,
the critical pressure recovery was increased approximately 12 percent by
employing corner fillets. With the h/6 1.0 configuration (fig. 8(b)),
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Valerino, Alfred S. Effects of internal corner fillets on pressure recovery: Mass flow characteristics of scoop-type conical supersonic inlets, report, December 8, 1952; (https://digital.library.unt.edu/ark:/67531/metadc64540/m1/5/: accessed March 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.