**5.2 CO<sup>2</sup> combustion: subsequent improvements**

subsequent studies will focus on alternative methodologies to achieve higher carbon dioxide combustions. There are several methods that can be considered such

**Figure 13.** *Oxide formation after the motor experiment.*

as (i) magnesium additive mass fraction increase in paraffin wax (up to 80%), (ii) aft injection methodologies to increase adiabatic flame temperature, (iii) Potassium nitrate addition into the fuel grain, and (iv) angled or swirl injection methods. All these methods are currently being used by hybrid propulsion community to improve internal ballistics during the combustions.
