WIND TUNNEL INVESTIGATION OF A SPIKE-BLUFF BODY COMBINATION FOR A MONORAIL ROCKET SLED M = 2.0 TO M= 5.0
Abstract
Results of wind tunnel measurements of lift, drag and pitching moment on a circular crosssection monorail sled using a flow separation spike including the influence of ground interference are presented and discussed. Variables investigated were the spike length, spike diameter and location on a series of sled nose shapes. Mach number range was from 2 to 5. The sled configuration having the largest drag (spike retracted) and the lowest drag ( SPIKE EXTENDED) was that with a flat face sled nose and with the spike mounted on the sled axis. The spike length for minimum drag, in general, became longer at higher speeds. Sled lift was essentially unaffected by variation of the spike length. Diameter of the spike had little effect on the overall lift or drag. Unsteady flow phenomena (buzzing) were observed for some sled configurations at spike lengths on the order of 1 to 1.5 body diameters, but not at spike lengths for minimum drag. When buzzing occurred it could be reduced or eliminated by rounding the sled nose shoulder. Mounting the spike below the sled axis diminished the drag reduction characteristics of the spike, increased the incidence of buzzing, but decreased the sled lift. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1962
- Accession Number
- AD0290609
Entities
People
- Donald R Olson
- Frederick Moynihan
- Rudolf Hermann
Organizations
- University of Minnesota