A Computer Study of the Effect of Ice Clouds on the CEP of a Zero-Lift Reentry Body

The reentry trajectory of a bluff zero-lift reentry body was computed using an HP-9845A computer. To obtain the external shape of an ablating reentry body was as a function of altitude, coefficients for polynomial equations were determined. At six discrete altitudes, the calculated nose shapes were...

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Bibliographic Details
Main Author: Mellor,Martin Warren
Format: Report
Language:English
Subjects:
ABLATION
AERODYNAMIC CHARACTERISTICS
BLUNT BODIES
CLOUDS
COMPUTER PROGRAMS
COMPUTERIZED SIMULATION
CRYSTALS
DRAG
EROSION
FLOW CHARTING
HUMIDITY
HYPERSONIC CHARACTERISTICS
HYPERSONIC FLOW
HYPERSONIC VELOCITY
ICE
Linear State estimation
NOSE CONES
REENTRY VEHICLES
State estimation
Statistics and Probability
STOCHASTIC PROCESSES
THESES
TRAJECTORIES
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Summary:The reentry trajectory of a bluff zero-lift reentry body was computed using an HP-9845A computer. To obtain the external shape of an ablating reentry body was as a function of altitude, coefficients for polynomial equations were determined. At six discrete altitudes, the calculated nose shapes were identical to published information for the nose shapes of a reentry body with silaceous ablation material. Newtonian flow and an exponential atmosphere were assumed throughout. The computer program was modified to include ablation due to ice crystal erosion, and the trajectory was recalculated for a model ice cloud 5,000 feet thick at an of 30,000 feet. A total of four trajectories was computed for various values of mass loss fraction for erosion due to ice. The differences in range from the initial trajectory without ice erosion were one to fifteen feet. (Author)