ESDU 96012: Subsonic and transonic base and boat-tail pressure drag of cylindrical bodies with circular-arc boat-tails

Abstract:

ESDU 96012 provides an empirical graphical method derived from a correlation of wind-tunnel data for the prediction separately of boat-tail and base pressure drag that applies at all Mach numbers up to 1.3. The method requires that there are at least three diameters of cylindrical body upstream of the boat-tail and that there is no jet efflux or base bleed. The method for base pressure drag applies for boat-tail angles (the angle made with the base) up to 45 degrees but for boat-tail drag only for boat-tail angles up to 25 degrees for subsonic Mach numbers, 30 degrees for a Mach number of 1 and 35 degrees for supersonic Mach numbers. The method may also be used for afterbodies of parabolic profile. The total afterbody drag is the sum of the two components. The quality of fit with the experimental data is illustrated; total drag coefficient based on body maximum diameter is estimated to within 0.015. However, because of the limited sample of data, it is suggested that an accuracy of 0.03 should be allowed for. A worked example illustrates the use of the method.

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Details:

Data Item ESDU 96012
Format:	PDF with interactive graphs
Status:	Amendment (B), 01 Mar 2017 Published in Release 2017-04 (Apr 2017)
Previous Releases:	ESDU 96012 Amendment A ESDU 96012
ISBN:	978 0 85679 976 1

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This Data Item contains 20 interactive graph(s) as listed below.

Graph	Title
Figure 1a	Base drag coefficient for M =< 0.8
Figure 1b	Base drag coefficient for M =< 0.8
Figure 2a	Base drag coefficient for M = 0.9
Figure 2b	Base drag coefficient for M = 0.9
Figure 3a	Base drag coefficient for M = 1.0
Figure 3b	Base drag coefficient for M = 1.0
Figure 4a	Base drag coefficient for M = 1.1
Figure 4b	Base drag coefficient for M = 1.1
Figure 5a	Base drag coefficient for M = 1.2
Figure 5b	Base drag coefficient for M = 1.2
Figure 6a	Base drag coefficient for M = 1.3
Figure 6b	Base drag coefficient for M = 1.3
Figure 7	Base drag coefficient of cylindrical afterbody
Figure 8	Boat-tail drag coefficient for M =< 0.6
Figure 9	Boat-tail drag coefficient for M = 0.8
Figure 10	Boat-tail drag coefficient for M = 0.9
Figure 11	Boat-tail drag coefficient for M = 1.0
Figure 12	Boat-tail drag coefficient for M = 1.1
Figure 13	Boat-tail drag coefficient for M = 1.2
Figure 14	Boat-tail drag coefficient for M = 1.3