Study on the calculation of the combustion products of the boron-based fuel-rich propellant during first combustion stage

The formulation of the first combustion products of the boron-based fuel-rich propellant was calculated by the minimum free energy method, and the calculated result was validated by the experiment of percentage of gas products and the determination of the content of boron in the solid products. The effect of formulation, pressure and combustion temperature on the formulation of the first combustion products was studied. The results show that it is believable to calculate the formulation of the first combustion products by the minimum free energy method. The percentage of the reacted boron decreases first and increases subsequently when the boron increases and AP decreases. The percentage of the reacted boron increases when the boron increases and Mg and Al decrease. The percentage of the reacted boron increases with the increase of the pressure when the content of boron is lower. The percentage of the reacted boron increases first and decreases subsequently with the increase of the pressure when the content of boron is higher. The high pressure will benefit the percentage of the Mg and Al when the pressure is low. The percentage of carbon decreases with the increase of pressure and the boron reacted favors existing with the form of B₂O₃. The percentage of reacted boron decreases and the percentage of carbon, Mg and Al increases when the combustion temperature increases. The boron reacted favors existing with the form of HBO when the temperature is higher.