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.
Highlights
A surface-type infrared (IR) decoy is compressed by thousands of strips of chaff
Two new factors are taken into account, namely the variation of the mass of the activated metal with oxygen consumption and the impact of the adiabatic wall computed by computational fluid dynamics (CFD) on the combustion temperature
The surface heat balance equation and the adiabatic wall temperature computed by CFD are applied to compute the combustion of pyrophoric multi-hole activated metal
Summary
The chaff is composed of multi-hole activated metal These diffuse rapidly in the presence of high-speed airflow and combust in the air. The radiation characteristics of the surface-type IR decoy is affected by the combustion of multihole activated metal. Through the holes in the multi-hole activated metal; the activated metal is exposed to air, which 2 enlarges the contact area and increases the pyrophoric rate of the chaff. Two new factors are taken into account, namely the variation of the mass of the activated metal with oxygen consumption and the impact of the adiabatic wall computed by CFD on the combustion temperature. As a classical kind of pyrophoric activated metal, is used to study activated metal chaff surface combustion characteristics in this work. Surface combustion characteristics of pyrophoric activated metal chaff are obtained by numerical computation
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