Citation
O'Bryant, William T. (1956) An experimental investigation of hypersonic flow over blunt nosed cones at a Mach number of 5.8. Engineer's thesis, California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd06182004111807
Abstract
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Shock shapes were observed and static pressures were measured on sphericallyblunted cones at a nominal Mach number of 5.8 over a range of Reynolds numbers per inch from 97,000 to 238,000 for angles of yaw from 0[degrees] to 8[degrees]. Six combinations of the bluntness ratios 0.4, 0.8, and 1.064 with the cone half angles 10[degrees], 20[degrees], and 40[degrees] were used in determining the significant parameters governing pressure distribution.
The pressure distribution on the spherical nose for both yawed and unyawed bodies is predicted quite accurately by the modified Newtonian theory given by [...], where [...] is the angle between the normal to a surface element and the flow direction ahead of the bow shock. On the nosecone junction and the conical afterbody, cone half angle was found to be the significant parameter in determining the length of the transition zone. For a cone halfangle of 40[degrees], a pressure minimum exists on the skirt immediately downstream of the nosecone junction, but this pressure minimum is located far downstream when the halfangle is 20[degrees]. The tangent cone concept at angles of yaw is useful in predicting the downstream movement of the pressure minimum. Shock detachment distance between bow shock and body surface on the axis varies linearly with nose radius. Drag coefficients for bodies at zero yaw compare very closely with those obtained by integrating the modified Newtonian approximation, except at large halfangles and low bluntnesses where drag approaches that given by the TaylorMaccoll theory for sharp cones.
Item Type:  Thesis (Engineer's thesis) 

Degree Grantor:  California Institute of Technology 
Division:  Engineering and Applied Science 
Major Option:  Aeronautics 
Thesis Availability:  Public (worldwide access) 
Research Advisor(s): 

Thesis Committee: 

Defense Date:  1 January 1956 
Record Number:  CaltechETD:etd06182004111807 
Persistent URL:  http://resolver.caltech.edu/CaltechETD:etd06182004111807 
Default Usage Policy:  No commercial reproduction, distribution, display or performance rights in this work are provided. 
ID Code:  2636 
Collection:  CaltechTHESIS 
Deposited By:  Imported from ETDdb 
Deposited On:  21 Jun 2004 
Last Modified:  26 Dec 2012 02:53 
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