Influences of pressure on reduced-gravity combustion of HAN–methanol–water droplets in air

Reduced-gravity experiments were performed to investigate combustion characteristics of individual monopropellant droplets composed of hydroxylammonium nitrate (HAN), methanol, and water. The experiments were conducted using the 2.2 Second Drop Tower at the NASA John Glenn Research Center at Lewis Field in Cleveland, OH. Gravitational levels were about 10−4 times normal gravity and experiments were performed in air at about 25 °C and with...