A transient one-dimensional model for metal combustion in steam
By: Zeev Shavit
Contributors: Naval Postgraduate School (U.S.). Space Systems Academic Group
Publisher: Naval Postgraduate School; Available from National Technical Information Service
Published: 1986
Place of publication: Monterey, Calif; Springfield, Va
Language: eng
Number of pages: 44
Subjects: COMBUSTION; METALS
Other titles: NPS-72-86-001CR.
Description: The possibility of ignition of some particles of a fragmented Under- Water (U/W)      Shaped-Charge (S/C) jet is examined. It was determined that only minute particles (less than      6 micron diameter) are likely to undergo complete melting. This estimate was based on the      high stagnation temperature upstream of a particle moving at a speed of 7000 m/sec in water      vapor within the cavity. Some two-color pyrometry tests of exploding wire that had been      conducted at the Naval Postgraduate School were re-examined. It is suggested that color      photographs of the corona region exhibit on going gas phase combustion. Due to the high      temperature (inferred from the color), it is contended droplets do not occur in that region      (either metal or oxide). The mode of combustion is distinctly different from metal droplet      combustion such as may take place in U/W S/C or in rocket combustion/Existing models for      metal droplet combustion were found to lack two features, namely full time-dependence and      oxide cloud radiation for a large volatile droplet. We suggest to incorporate these features in      the proposed model. For simplicity, only the one dimensional (spherically symmetry) case is      considered. Metal liquid to vapor interface is not treated explicitly but through including th      vapor quality and vaporization latent heat into the total metal enthalpy. The condensed oxide      (according to local equilibrium composition), is considered as a second phase. Thus the model      ought to be adequate for either volatile or non-volatile process of metal combustion.      Keywords: Metal combustion, Exploding wire, Transient droplet combustion.
Notes: Title from cover.

"NPS-72-86-001CR."

"August 1986."

AD A177 395.

Includes bibliographical references (p. 40-41).

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