Experimental studies were carried out to measure the aerodynamic
forces in the presence of the spike attached to the blunt body for
the length to diameter ratio of 0.5, 1.0, 1.5 and 2.0 and angle of
attack up to 8 degree at Mach number 6. Five types of spikes,
namely, conical, hemisphere, flat-face, hemisphere-disk and flat
face-disk spikes were studied. The effect of conical and
hemispherical spikes and flat faced-disk and a hemispherical-disk
attached to a blunt nosed basic body has been investigated. The
flow field was visualized with schlieren system. The coefficients
of drag, lift and pitching moment were measured for different spike
configurations using the six-component strain gauge balance. The
influence of the spike shock wave generated from the spike which
interacts with the reattachment shock was also investigated to
understand the cause of drag reduction. Surface pressure
distribution over the nose of the basic body was measured for all
the cases of with and without spike at = 0 and 5 degree and Mach
6."
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