ADN基液体推进剂空间发动机工作过程模拟

发布时间：2018-06-11 16:30

本文选题：二硝酰胺铵(ADN)基液体推进剂 + 空间发动机　；参考：《清华大学学报(自然科学版)》2016年10期

【摘要】：二硝酰胺铵(ADN)基液体推进剂是一种绿色环保的新型推进剂,可在小型空间推进系统中使用。该文通过数值模拟对ADN基液体推进剂空间发动机的工作过程进行热流仿真。使用Euler-Lagrange方法描述推进剂的蒸发过程,使用多孔介质局部非平衡模型描述催化床内的传热过程,同时考虑气、液、固三相之间的耦合。使用包含18组分40步反应的ADN-CH3OH简化反应机理来模拟气相物质的燃烧反应。数值计算所得发动机的宏观运行参数与实验值相符。结果表明:多孔介质会将催化床下游和燃烧室内反应所释放热量传导到催化床上游,强化推进剂的蒸发过程。在发动机内部,ADN与CH3OH的反应并不同步。ADN的热解反应发生在入口附近,而CH3OH的氧化反应发生在催化床中下游和燃烧室中。
[Abstract]:The liquid propellants based on ammonium dinitrate (ADN) are a new type of propellants which are green and environmentally friendly and can be used in small space propulsion systems. In this paper, the working process of ADN-based liquid propellant space engine is simulated by numerical simulation. The Euler-Lagrange method is used to describe the evaporation process of propellants, and the local non-equilibrium model of porous media is used to describe the heat transfer process in the catalytic bed. The coupling of gas, liquid and solid three phases is considered at the same time. ADN-CH3OH, which consists of 18 components and 40 steps, is used to simplify the reaction mechanism to simulate the combustion reaction of gaseous substances. The macroscopic operating parameters of the engine obtained by numerical calculation are in agreement with the experimental values. The results show that the heat released from the reaction downstream of the catalytic bed and combustion chamber can be transferred to the upstream of the catalytic bed in porous media to enhance the evaporation process of the propellant. The reaction between ADN and CH3OH does not synchronize with the reaction of CH3OH in the engine. The pyrolysis reaction of ADN occurs near the inlet, while the oxidation of CH3OH takes place in the middle and lower reaches of the catalytic bed and in the combustion chamber.
【作者单位】：清华大学热能工程系;北京控制工程研究所;
【基金】：国家自然科学基金青年项目(51506007)
【分类号】：V511

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