Numerical and experimental study of pyrophoric activated metal Mg surface combustion characteristics

Abstract

The combustion of multi-hole pyrophoric activated metal is solid combustion and the combustion mechanism is quite complex, which is a difficult problem to be solved. Once the pyrophoric activated metal is exposed to air, the oxygen diffuses to the interior of the activated metal within plenty of holes and reacts with it, which enlarges the contact area with oxygen. Consequently, the whole combustion is vigorous and the temperature rises rapidly. To study the combustion mechanism of the chaff, the surface heat balance equation is established in this work by taking Mg as the activated metal. To solve this equation, the chaff adiabatic wall temperature distribution is computed by computational fluid dynamics in the presence of high-speed airflow. Then, the chaff surface temperature distribution is obtained by solving the heat balance equations. Finally, numerical and experimental results obtained via an infrared thermal imager are compared to demonstrate the effectiveness of the established equation.

Research of Pyrophoric Compounds in Order to Reduce their Hazard

“…The mechanism of pyrophorically activated metal combustion is quite complicated, and is a complex problem [9] that needs to be solved. As soon as the pyrophoric activated metal is activated by air oxygen, oxygen diffuses into the activated metal in large quantities and reacts with it, which increases the contact area with oxygen [9].…”

“…The mechanism of pyrophorically activated metal combustion is quite complicated, and is a complex problem [9] that needs to be solved. As soon as the pyrophoric activated metal is activated by air oxygen, oxygen diffuses into the activated metal in large quantities and reacts with it, which increases the contact area with oxygen [9]. Therefore, the solution to this problem may be connected with the development of innovative methods and means of pyrophoric deposits phlegmatization, cleaning them off the inner surface of the tank equipment for petroleum products storage.…”