Spherical gas-fueled cool diffusion flames

An improved understanding of cool diffusion flames could lead to engines. These are investigated here using a spherical porous burner with gaseous fuels in the microgravity environment International Space Station. Normal and inverse burning ethane, propane, n-butane were explored various fuel oxygen concentrations, pressures, flow rates. The diagnostics included an intensified video camera, radiometers, thermocouples. Spherical gases observed for first time. However, these not readily produced only obtained normal at 2 bar ambient mole fraction 0.39. hot that spawned 2.6 times as large. analytical model is presented combines previous models steady droplet partial-burning regime flames. results identify importance temperature on behavior They also indicate reside rich regions near mixture 0.53.