A transient one-dimensional model for metal combustion in steam
MetadataShow full item record
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
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
NPS Report NumberNPS72-86-001CR
Showing items related by title, author, creator and subject.
Goodwin, William Vernon (Monterey, California. Naval Postgraduate School, 1981-06);An experimental investigation was conducted into four areas of the solid fuel ramjet combustion process: (1) the effects of near-wall turbulent mixing and equivalence ratio on combustion efficiency, (2) the effects of ...
Chozev, Yair; Kol, Jacob (Monterey, California. Naval Postgraduate School, 1985-07-01); NPS67-85-004CRThis paper presents a summary of the experimental results and studies of magnesium combustion in steam. The major subject of these studies was to measure the temperature of magnesium particles after the particles had been ...
Compton, Oliver Doty (Troy, New York; Rensselaer Polytechnic Institute, 1947-06-16);This thesis undertakes a general investigation of combustion in a flowing stream. It was first necessary to determine, if possible, the mechanism of burning, the establish the flow characteristic which must be present for ...