Study on thermodynamic properties of nitrous oxide fuel blends by oxygen-bomb calorimeter and PHI-TECII

摘要

Nitrous oxide fuel blends are the promising green space monopropellants with very high performance, easy ignition, low toxicity and potential low cost. However, little is known about their thermodynamic properties, which are help for safe operations and storage of these blends. In this study, PARR-6300 oxygen-bomb calorimeter and a high-performance adiabatic calorimeter (Phi-TEC II) were used to demonstrate the combustion heat values and thermal hazards of these mixtures. The results showed that the mole isochoric heat capacities of N2O/C2H4, N2O/NH3 and N2O/C3H8 have been determined to be 2882 J?mol-1?K-1, 737 J?mol-1?K-1 and 5499 J?mol-1?K-1, respectively, using Hess Law to derive combustion reaction of premixed mixtures that may occur, and analyzing the reasons of differences between the theoretical value with the experimental value. N2O/C2H4, N2O/NH3 and N2O/C3H8 would suffer from thermal decomposition until 408 K, 463 K and 428 K, respectively.