“Green” monopropellants based on hydroxylammonium nitrate (HAN) are of interest for replacing highly toxic hydrazine in space propulsion systems and for other applications. However, their combustion mechanisms at high pressures are not well understood. In the present paper, decomposition of HAN at pressures up to 15 MPa was studied with differential scanning calorimetry, while combustion of an aqueous HAN/methanol solution (70.1 wt% HAN and 14.9 wt% methanol) was studied in a strand burner at pressures up to 30 MPa. The experiments in both setups were conducted in a nitrogen environment. It has been shown that the decomposition temperature of HAN significantly decreases with increasing pressure from atmospheric to 2 MPa and remains virtually constant with further increasing pressure to 15 MPa. The decrease with pressure is explained by suppressing evaporation of HNO₃ and H₂O formed during the decomposition process. The strand burner experiments have revealed an increase in the linear burning rate by over 50% at 12−14 MPa, explained by reaching the critical pressure of the liquid. Other observed pressure dependencies of the burning rate include a decrease at 9–12 MPa, a plateau at 14–19 MPa, a decrease at 20 MPa, and an increase at 22–30 MPa.

基于硝酸羟铵（HAN）的“绿色”单推进剂对于取代空间推进系统中的高毒性肼和其他应用非常有用。但是，它们在高压下的燃烧机理还没有被很好地理解。在本文中，利用差示扫描量热法研究了在高达15 MPa的压力下HAN的分解，而在压力高达15 MPa的线束燃烧器中研究了HAN /甲醇水溶液（70.1 wt％HAN和14.9 wt％甲醇）的燃烧。至30 MPa。两种设置中的实验都是在氮气环境中进行的。已经表明，HAN的分解温度随着压力从大气压增加到2MPa而显着降低，并且随着压力进一步增加到15MPa而实际上保持恒定。₃和H ₂ O在分解过程中形成。线束燃烧器的实验表明，在12-14 MPa下，线性燃烧速率提高了50％以上，这可以通过达到液体的临界压力来解释。其他观察到的燃烧速率的压力依赖性包括在9–12 MPa时降低，在14–19 MPa时达到平稳，在20 MPa时降低以及在22–30 MPa时升高。