Fuel Drops Research Articles

Study on the Burning of a Fuel Drop in Heated and Pressurized Air Stream : 2nd Report, Empirical Formulas Concerning the Burning Rate and the Flame Shape

A few empirical formulas describing the burning rate of a fuel drop have been published already. But their validity is restricted to the case of atmospheric pressure. Regarding the quantities which provide the flame shape, no attempt has been made to formulate them. In this report, the empirical formulas for the burning rate and the flame shape were derived respectively under the theoretical consideration. The derivation was carried out as follows. After finding out the dimensionless factors governing the phenomena by applying the law of similitude to the fundamental equations and boundary conditions, the functional relations between them were determined by using the experimental results of the 1st Report. Thus, the empirical formulas common to fuels of three kinds used were obtained. In addition, it was confirmed by comparing with the experimental results that these formulas would be available to the extent of fine droplet (∼100 microns in diameter).

Fuel Drop Vaporization under Pressure on a Hot Surface

The evaporation lifetime of liquid fuel drops in contact with a hot surface is investigated at pressures of up to 69 atm. Modes of evaporation and drop behaviour at subcriticai and supercritical conditions of temperature and pressure are described. It is shown that at any subcriticai pressure the lifetime is a minimum at a surface temperature just above the saturation temperature; the lifetime at all supercritical pressures is a constant minimum when the surface temperature is 60 degC or more than the critical temperature of the liquid. The heat flux to a drop in the contact modes of evaporation has a maximum value comparable to the peak heat flux obtained in boiling heat transfer work. Subsidiary tests at atmospheric pressure investigate the influence of surface material, surface finish, and initial drop temperature upon the lifetime; the transient surface interface temperature during evaporation is also investigated. The application of the data to deposited fuel in engines is discussed.

Study on the Burning of a Fuel Drop in Heated and Pressurized Air Stream : 2nd Report Empirical Formulas Concerning the Burning Rate the Flame Shape

Study on the Burning of a Fuel Drop in Heated and Pressurized Air Stream : 2nd Report Empirical Formulas Concerning the Burning Rate the Flame Shape

Study on the Burning of a Fuel Drop in Heated and Pressurized Air Stream : 3rd Report Empirical Formula for the Flame Transition Velocity

Study on the Burning of a Fuel Drop in Heated and Pressurized Air Stream : 3rd Report Empirical Formula for the Flame Transition Velocity

Study on the Burning of a Fuel Drop in Heated and Pressurized Air Stream : 1st Report Experiment

Study on the Burning of a Fuel Drop in Heated and Pressurized Air Stream : 1st Report Experiment

Hypersonic Shock Wave-Boundary Layer Interaction and Leading Edge Slip

WADC T. B. 56-344, Office of Technical Service, U. S. Dept. of Comm., Washington, D. C , 1957. 5 El-Wakil, M. M., Uyehara, O. A. and Meyers, P. S., A Theoretical Investigation of the Heating-Up Period of Injector Fuel Droplets Vaporizing in Air, NACA TN 3179, 1954. 6 El-Wakil, M. M., Priem, R. J., Brikowski, H. J., Myers, P. S. and Uyehara, 0 . A., Experimental and Calculated Temperature and Mass Histories of Vaporizing Fuel Drops, NACA TN 3490, 1956. 7 Priem, R. J., Borman, G. L., El-Wakil, M. M., Uyehara, O. A. and Myers, P. S., Experimental and Calculated Histories of Vaporizing Fuel Drops, NACA TN 3988, 1957. 8 Borman, G. L., El-Wakil, M. M., Uyehara, O. A. and Myers, P. S.,

Measurement of the Burning Constant of a Fuel Drop

Measurement of the Burning Constant of a Fuel Drop

ディーゼル機関の無気噴油作用に於る油滴の大いさ

ディーゼル機関の無気噴油作用に於る油滴の大いさ