Physics Based Modeling of Hydrometeor/ Aerodynamic Interactions due to Ballistic Missiles Radomes

Award Information
Agency: Department of Defense
Branch: Missile Defense Agency
Contract: HQ0006-06-C-7505
Agency Tracking Number: B064-013-0018
Amount: $99,949.00
Phase: Phase I
Program: STTR
Awards Year: 2006
Solicitation Year: 2006
Solicitation Topic Code: MDA06-T013
Solicitation Number: N/A
Small Business Information
AQUILA LABORATORY
5385 Hollister Avenue, MB205, Santa Barbara, CA, 93111
DUNS: 360943133
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 William Adler
 Chief Scientist
 (805) 692-2341
 wadler@sysci.org
Business Contact
 William Adler
Title: Sole Proprietor/Owner
Phone: (805) 692-2341
Email: wadler@sysci.org
Research Institution
 JOHNS HOPKINS UNIV.
 Kelly Frazer
 Applied Physics Laboratory 111
Laurel, MD, 20723
 (240) 228-6538
 Federally funded R&D center (FFRDC)
Abstract
Hydrometeor impact/erosion qualification evaluations of aerospace vehicle components have to relate testing carried out in ground test facilities to what the components experience in the flight environment. The size distribution and condition of the hydrometeors that impact the surface of a radome can differ substantially from what they are in the natural environment before encountering a missile’s bow shock. The resulting transformed conditions of the hydrometeors have a strong influence on the magnitude and extent of any damage that results from their collision with a radome’s surface. Previous analyses have concentrated on spherical raindrops, however falling raindrops greater that 1 mm are not spherical but develop a flattened shape that becomes more severe with increasing diameter. Rain is present up to roughly 5 km and can be anywhere from a small to moderate fraction of the hydrometeor population in the prevailing adverse weather. Other types of hydrometeors comprising adverse weather are present at higher altitudes where the missile’s velocity is increasing. Methods will be developed to calculate what happens to the falling raindrop geometries, the prevalent geometries of irregular shaped ice particles, and additional hydrometeor types when they pass through the missile’s bow shock to impact the radome.

* information listed above is at the time of submission.

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