- Author
-
Faeth, G. M.
- Title
- 1970 Annual Report on the Investigation of Critical Pressure Burning of Fuel Droplets.
- Coporate
- Pennsylvania Univ., Philadelphia
- Sponsor
- National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH
- Report
-
NASA CR-72834
January 1971
37 p.
- Distribution
- Available from National Technical Information Service
- Contract
- NGR-39-009-077
- Keywords
-
fuel droplets
|
pressure
|
combustion
|
burning rate
|
fire tests
- Abstract
- Measurements were made of steady burning temperatures, and the pressures required for the supercritical combustion of n-octane and n-decane droplets burning in air. Theoretical results were obtained with a low pressure model of droplet phase equilibrium as well as a high pressure model which accounted for dissolved gas in the liquid phase. The high pressure model gave a reasonably good prediction of droplet temperatures andthe pressures requied for supercritical combustion (on the order of 2-2.5 times the critical pressure of the pure fuel for the present test conditions) while the low pressure theory predicted supercritical combustion pressures roughly one half the measured values. Experimental results are also described on the burning of hydrazine, MMH and UDMH droplets in the combustion products of a flat falme burner at atmospheric pressure. These tests were conducted with ambient temperatures in the range 1650-2550 K and ambient oxygen concentrations up to 42% by mass. The burning rates of the three fuels were similar and showed a strong increase with ambient oxygen concentration.