Abstract/Details

Raindrop demise in a high-speed projectile flowfield


2010 2010

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Abstract (summary)

This research examined current approaches used to model raindrop demise in high-speed missile flowfields. Historical correlations derived from shock tube data do not capture all of the critical non-dimensional parameters and temporal droplet shape change and as such are not accurate. In addition, while droplet demise studies in shock tubes provide valuable data for code validation, it was established that the data cannot be directly used to develop projectile induced droplet demise estimates. A numerical approach was developed based on the Smooth Particle Hydrodynamics-C (SPHC) code to model the entire temporal evolution of the macroscopic droplet demise process from shock crossing to catastrophic break-up. As part of this effort, an extended algebraic equation of state was developed for water including the supercooled region. A series of unit problems was simulated to verify that the numerical method was able to capture the required flow field instabilities and relevant physics inherent in drop demise. The numerical approach was then used to investigate the internal environment of the water drop during the demise process. Highlights of this investigation included the capture of wave instabilities on the surface of the drop, wave crest stripping of small water droplets, the likely cause of the lateral droplet dilation, and the internal temporal droplet pressure and velocity distribution. The SPHC simulations suggest that for a Weber number range of 5000–40,000, the Kelvin-Helmholtz instability is the primary mechanism driving mass stripping and that spherical droplets are stable against Rayleigh-Taylor instabilities. This conclusion is supported by recently obtained droplet demise empirical data.

Indexing (details)


Subject
Aerospace engineering;
Mechanical engineering
Classification
0538: Aerospace engineering
0548: Mechanical engineering
Identifier / keyword
Applied sciences; Droplet demise; Projectile flowfield; Raindrop
Title
Raindrop demise in a high-speed projectile flowfield
Author
Moylan, Bruce Emerson
Number of pages
182
Publication year
2010
Degree date
2010
School code
0278
Source
DAI-B 71/12, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781124299136
Advisor
Landrum, Brian
University/institution
The University of Alabama in Huntsville
University location
United States -- Alabama
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3429637
ProQuest document ID
761654600
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/761654600/abstract
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