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- W817131029 abstract "NACA EM L78G27NATIONAL ADVISORY COMMITTEE FOR AERONAUTICSRESEARCH MEMORANDUM EFFECT OF CONVERGENT EJECTOR NOZZLES ON THEBOATTAIL DRAG OF A 16° CONICAL AFTERBODY AT MACH NUMBERS OF 0.6 TO 1.26* By James M. Cubbage, Jr. SUMMARY An investigation has been conducted at Mach numbers of 0.6 to 1.26 to determine the effect of two convergent ejector-type nozzles with secondary weight flow ratios up to 0.36 on the drag of a 160 conical afterbody. The nozzles had ratios of secondary exit diameter to primary exit diameter of 1.1 and 1.377 and spacing ratios ranging from 0 to 1.6. Primary jet pressure ratios for these nozzles ranged from 2 to 8. The results show that secondary flow rates greater than those usually required for cooling purposes did not have a large effect on the boattail drag coefficient; however, a trend to lower drag was noted as the amount of secondary flow increased. At primary jet pressure ratios corresponding to the design pressure ratio, the boattail drag coefficient increased with increasing spacing ratio up to a spacing ratio of about 0.8. INTRODUCTION The use of ejector-type exhaust nozzles on jet-propelled aircraft to provide cooling air for the tailpipe and nozzle in addition to some thrust augmentation has resulted in a number of investigations to deter-mine the effect of various parameters on ejector performance. In con-sidering the overall performance of this type of system, the effect of the jet from an ejector-type nozzle on afterbody drag must also be deter-mined. Recent transonic investigations of jet effects on afterbody drag have, in general, been conducted with nonejector type of nozzles to sim-plify model construction and to expedite testing. Such investigations (for example, refs. 1 to" @default.
- W817131029 created "2016-06-24" @default.
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- W817131029 date "1955-09-17" @default.
- W817131029 modified "2023-09-24" @default.
- W817131029 title "Effect of convergent ejector nozzles on the boattail drag of a 16 degree conical afterbody at Mach numbers of 0.6 to 1.26" @default.
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