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Aerodynamic Drag on Spiked Blunt Bodies in Low-Density Hypersonic Flow.

AD603567

Publication Date	1964
Personal Author	Sims, W. R.; Hahn, J. S.
Page Count	2
Abstract	Aerodynamic drag on spiked blunt bodies was measured in hypersonic, low-density flow of nitrogen. Two models were tested: a spherically capped cone of 10-deg halfangle at 0 < alpha < 40 deg, and a right circular cylinder at alpha = 0. Reynolds numbers, based on total body lengths and free-stream conditions, varied from 200 to 1200. Mach number was constant at 10.1. Results were compared with modified Newtonian and free-molecule calculations. Effects of hypersonic rarefied flow are apparent, with drag coefficient increasing for large angles of attack for all spike lengths. A correlation procedure suggested in an earlier report for a large class of similar bodies at 0-deg angle of attack is shown to be effective in the case of spiked bodies too. It is apparent that the marked reduction of drag effected by use of spikes on blunt-nosed bodies at higher Reynolds numbers is greatly diminished when low Reynolds numbers exist. However, a moderate reduction is shown for small angles of attack at the Reynolds numbers of the present experiment. (Author)
Keywords	SPIKES BLUNT BODIES AERODYNAMIC CHARACTERISTICS HYPERSONIC FLOW NITROGEN DENSITY DRAG MODEL TESTS CONICAL BODIES CYLINDRICAL BODIES REYNOLDS NUMBER TRANSPORT PROPERTIES ANGLE OF ATTACK CORRELATION TECHNIQUES WIND TUNNELS
Corporate Authors	Arnold Engineering Development Center Arnold Air Force Station Tenn
Document Type	Technical Report
NTIS Issue Number	196501
Contract Number	AF40 600 1000

Aerodynamic Drag on Spiked Blunt Bodies in Low-Density Hypersonic Flow.

Aerodynamic Drag on Spiked Blunt Bodies in Low-Density Hypersonic Flow.
AD603567

Publication Date	1964
Personal Author	Sims, W. R.; Hahn, J. S.
Page Count	2
Abstract	Aerodynamic drag on spiked blunt bodies was measured in hypersonic, low-density flow of nitrogen. Two models were tested: a spherically capped cone of 10-deg halfangle at 0 < alpha < 40 deg, and a right circular cylinder at alpha = 0. Reynolds numbers, based on total body lengths and free-stream conditions, varied from 200 to 1200. Mach number was constant at 10.1. Results were compared with modified Newtonian and free-molecule calculations. Effects of hypersonic rarefied flow are apparent, with drag coefficient increasing for large angles of attack for all spike lengths. A correlation procedure suggested in an earlier report for a large class of similar bodies at 0-deg angle of attack is shown to be effective in the case of spiked bodies too. It is apparent that the marked reduction of drag effected by use of spikes on blunt-nosed bodies at higher Reynolds numbers is greatly diminished when low Reynolds numbers exist. However, a moderate reduction is shown for small angles of attack at the Reynolds numbers of the present experiment. (Author)
Keywords	SPIKES BLUNT BODIES AERODYNAMIC CHARACTERISTICS HYPERSONIC FLOW NITROGEN DENSITY DRAG MODEL TESTS CONICAL BODIES CYLINDRICAL BODIES REYNOLDS NUMBER TRANSPORT PROPERTIES ANGLE OF ATTACK CORRELATION TECHNIQUES WIND TUNNELS
Corporate Authors	Arnold Engineering Development Center Arnold Air Force Station Tenn
Document Type	Technical Report
NTIS Issue Number	196501
Contract Number	AF40 600 1000