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Effects of Secondary-Air Flow on Annular Base Force of a Supersonic Airplane

Description: Memorandum presenting an investigation of the effect of base bleed on the base force of a supersonic-interceptor model in the 8- by 6-foot supersonic wind tunnel. Two groups of fixed-geometry nozzles and shroud combinations simulating double-iris-type configurations were evaluated over a range of secondary to primary exit-diameter ratios.
Date: October 11, 1954
Creator: Vargo, Donald J.
Partner: UNT Libraries Government Documents Department

Investigation of an Underslung Normal-Wedge Inlet at Free-Stream Mach Numbers From 1.50 to 1.99

Description: Two normal -wedge-inlet configurations (straight and sweptback splitter plates) were investigated in the Lewis 8- by 6-foot supersonic wind tunnel at Mach numbers of 1.50 to 1.99. Negligible differences occurred in the performances of the two normal-wedge inlets. In comparison with a previously tested scoop inlet, the normal-wedge configuration showed superior thrust-minus-drag characteristics at Mach 1.99. However the scoop inlet was better at Mach numbers of 1.80 and 1.50.
Date: March 19, 1957
Creator: Vargo, Donald J. & Weinstein, Maynard I.
Partner: UNT Libraries Government Documents Department

Effect of Nozzle Contour on Drag of Parabolic Afterbodies

Description: Memorandum presenting an investigation of the effect of nozzle internal contour on afterbody drag in the 8- by 6-foot supersonic wind tunnel. Five different nozzle-afterbody configurations were evaluated. Results regarding the boattail pressure drag, base drag, and total drag are provided.
Date: June 21, 1954
Creator: Vargo, Donald J. & Englert, Gerald W.
Partner: UNT Libraries Government Documents Department

Effect of circumferential location on angle of attack performance of twin half-conical scoop-type inlets mounted symmetrically on the RM-10 body of revolution

Description: Report presenting an investigation to determine the effect of circumstantial inlet location on the performance of twin half-conical scoop-type inlets with and without boundary-layer removal at several Mach numbers and angles of attack. For positive angles of attack, higher pressure recovery performance was obtained with the inlets mounted on lower fuselage quadrants than on upper quadrants.
Date: September 9, 1953
Creator: Valerino, Alfred S.; Pennington, Donald B. & Vargo, Donald J.
Partner: UNT Libraries Government Documents Department

Investigation of a High-Performance Top Inlet to Mach Number of 2.0 and at Angles of Attack to 20 Degrees

Description: Memorandum presenting several top-inlet configurations tested on a body of revolution in the 8- by 6-foot supersonic wind tunnel at a range of angles of attack and free-stream Mach numbers. The effect on performance of the following variables were studied: throat bleed, ramp perforations, inlet approach surface, side fairings, fuselage fences, canopies, and a simulated 60 degree delta wing.
Date: March 20, 1957
Creator: Vargo, Donald J.; Parks, Philip N. & Davis, Owen H.
Partner: UNT Libraries Government Documents Department

Effect of Jet-Nozzle-Expansion Ratio on Drag of Parabolic Afterbodies

Description: The interaction of the flow from one convergent and two convergent-divergent nozzles on parabolic afterbodies was studied at free-stream Mach numbers of 2.0, 1.6, and 0.6 over a range of jet pressure ratio. The influence of the jet on boattail and base drag was very pronounced. Study of the total external afterbody drag values at supersonic speeds indicated that, over most of the high-pressure-ratio range, increasing the nozzle design expansion ratio increased the drag even though the boattail area was reduced. Increasing the pressure ratio tended to increase slightly the total-drag increment caused by angle-of-attack operation.
Date: April 19, 1954
Creator: Englert, Gerald W.; Vargo, Donald J. & Cubbison, Robert W.
Partner: UNT Libraries Government Documents Department

Investigation of an Underslung Scoop Inlet at Mach Numbers to 1.99

Description: Memorandum presenting a study of the performance of a scoop-type inlet on the bottom of a body of revolution at a range of Mach numbers and angles of attack to 10 degrees. The investigation included a study of the effects of altering the approach surface ahead of the inlet, extending the boundary-layer splitter plate, and bleeding air at the throat and exit of the diffuser. Results regarding the flow survey ahead of the inlet, alternative configurations, internal-flow details of the basic configuration, air bleed at the throat, and air bypass at the engine face are provided.
Date: March 13, 1957
Creator: Weinstein, Maynard I.; Vargo, Donald J. & McKevitt, Frank
Partner: UNT Libraries Government Documents Department