- Author
-
Teodorczyk, A.
|
Wojcicki, S.
- Title
- Combustion of a Liquid Fuel Droplet During Forced Convection.
- Coporate
- Warsaw Technical Univ., Poland
Washington State Univ., Pullman
- Report
-
WSS/CI 83-36,
- Book or Conf
- Combustion Institute/Western States Section. Spring Meeting, 1983. April 11-12, 1983,
Pasadena, CA,
46 p.,
1983
- Keywords
-
fuel droplets
- Abstract
- A new experimental technique was used to investigate single fuel droplet combustion under the conditions of forced convection: the burning droplet was freely suspended in the controlled air stream, without any additional support. Based on the photo-records of the burning process, the characteristics of the change of square of droplet diameter with time were made and the actual values of burning constnts were determined for four hydrocarbon fuels: Benzene, n-heptane, iso-octane and toluene. The experiments were carried out under zero-gravity and normal gravity conditions for the same set of fuels. The investigations have allowed the comparison of the burning mechanisms of a single droplet for three different external conditions and have compared quantitatively the burning constants. On the basis of the color pictures of the droplet burning under forced convection conditions and the temperature and gas concentration measurements within the flame, the mechanism of the burning of the fuel vapors washed off the droplet surface was explained. The physical and mathematical models of the process have been proposed which included the aerodynamics of the droplet located in the high Reynolds number air stream, the energy balance of the burning droplet and the chemical reaction in the flow. The models have made it possible to determine the quantitative dependence of the burning constant of different kinds of fuels on Reynolds number, the flow field parameters and the physical and chemical parameters of the liquid and its close surroundings. The calculated values of the parameters describing the burning process hve been compared to the experimental data and to the results reported by other investigators.