Effects of the Initial Heat-Up Period on a Two-Droplet Array Burning at High Pressure in Microgravity.

The interactive combustion of two closely-spaced droplets at elevated pressures was investigated experimentally in a 2.2 second drop tower. Heptane, hexadecane and mixtures of the two were the fuel. A nitrogen-Oxygen ambient with a relatively low oxygen concentration faciliated observation of droplets during combustion at elevated pressures. Results show that staged combustion of binary fuel droplets still exists for interacting droplets at...