Burning characteristics of premixed sprays and gas-liquid coburning mixtures

Journal Article · Sat Oct 01 04:00:00 EDT 1988 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(88)90085-5· OSTI ID:6545789

Nakabe, K; Mizutani, V; Hirao, T ^[1]; Tanimura, S ^[2]

---

1. Dept. of Mechanical Engineering, Osaka Univ., 2-1 Yamadaoka, Suita, Osaka 565 (JP)
2. Mitsubishi Heavy Industries, Ltd. (JP)

A premixed spray burner was carefully designed for the observation of stable turbulent flames propagating in a droplet cloud suspended in a stream of air or for a gaseous fuel-air mixture. Various methods were examined to determine the most suitable reference surface of a spray flame, corresponding to its burning velocity. Difficulties arose in finding the reference flame surface, which governs the burning velocity of sprays, because the spray flames were usually thick and unsteady. It was found that the surface on which the OH radical emission had a peak intensity was more suitable as a reference flame surface than the surfaces determined by either direct or schlieren photography. The qualitative features of our burning velocity data for kerosene sprays agree with those of other investigators; that is, the authors found a linear dependence on the fuel-to-air ratio and an inverse proportionality to the Sauter mean diameter. Concerning coburning, there exists an optimum kerosene-to-propane mass flow ratio and an optimum mean droplet diameter that maximizes the burning velocity. Instantaneous flame images in OH and C/sub 2/ radical bands seem to suggest that group combustion occurs in a spray flame.

• OSTI ID: 6545789
• Journal Information: Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 74:1; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
025000 -- Petroleum-- Combustion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
42 ENGINEERING
421000* -- Engineering-- Combustion Systems
ALKANES
BURNERS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION
COMBUSTION KINETICS
DESIGN
DISPERSIONS
FLAMES
FLUID FLOW
FLUIDS
FUELS
GAS FUELS
HYDROCARBONS
KEROSENE
KINETICS
LIQUID FUELS
LIQUIDS
MIXTURES
ORGANIC COMPOUNDS
OXIDATION
PETROLEUM PRODUCTS
PROPANE
REACTION KINETICS
THERMOCHEMICAL PROCESSES
THERMODYNAMICS
TURBULENT FLOW