Experimental study of hexamethylenetetramine gasification at different temperatures of gas flow

The work is devoted to the simulation of the propulsion system. A low-temperature gas generator might be included in the solid-fuel ramjet to produce high-calorific gases. The gasification of a solid porous hexamethylenetetramine (urotropine) during the filtration of high-temperature gas through it was experimentally studied. It is shown that with an increase in the initial temperature of the filtered gas, the time of urotropine gasification decreases, the intensity of the fuel gasification process increases, which leads to an increase in the flux of urotropine gasification products. In the temperature range of 450-500 K, an intensive gasification of urotropine occurred, while the temperature of the outgoing gaseous products changed slightly. An increase in the inlet gas temperature from 650 to 850 K led to an increase in the mass rate of urotropine gasification from 0.23 to 0.69 g/ s, as well as an increase in the flux of urotropine gasification products from 0.31 to 0.93 g per 1 g of nitrogen. At temperatures below 800 K urotropin only sublimates. At higher gasification temperatures not only sublimation occurs, but also decomposition of urotropin to simpler gaseous products (mainly hydrogen).