Metal Slurry Droplet and Spray Combustion
Abstract
Analytical and numerical studies on n-octane and aluminum metal slurry droplet combustion and metal slurry spray combustion are discussed. Two limiting isolated droplet configurations are studied: one with large metal particle enveloped by liquid hydrocarbon and another with many fine metal particles inside a liquid drop. Vaporization models for isolated slurry droplets are formulated which can be used in spray combustion calculations. An analytical model describes the combustion of aluminum particles in air. The particle transient heating, the phase-equilibrium conditions of the vapor and condensed products are analyzed. Mass and energy interactions between the slurry droplets and gas flow are studied in an idealized configuration consisting of parallel droplet streams. Without forced convection and preheat of the ambient air to temperatures near the aluminum oxide melting point, the flame does not possess sufficient energy to ignite the metal. Ignition times for the metal particle depend on the solid mass loading and can be several times larger than the liquid fuel burnout time. With many fine metal particles which are initially uniformly distributed in a liquid fuel droplet, depending on the shell characteristics different modes of liquid vaporization from the droplet can occur. At different combustor locations, interacting and distinct premixed and diffusion type reaction zones are present. The heating and burning times of the metal agglomerate are much larger than the liquid fuel vaporization times and increase with increasing metal particle size and metal loading of the droplets. Metal slurry vaporization; metal slurry combustion; aluminum particle combustion; aluminum particle burning; slurry droplets and sprays.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 15, 1993
- Accession Number
- ADA269648
Entities
People
- R. Bhatia
- William A. Sirignano
Organizations
- University of California, Irvine